"I will never kick a rock"

The glaciers of Grand Gorge 4-14-17

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Grand Gorge gap

Windows Through Time

Robert Titus

Columbia-Greene Media

June 17, 2010

 

One of my favorite views in all the Catskills can be seen as you drive south on Rte. 30 on your way towards Grand Gorge. You go around a broad curve in the road and there, off in the distance, is Grand Gorge: not the town but the actual, genuine, authentic gorge itself. If you look in the distance you will see that break in the mountains, a hole in the horizon. This is the gorge; well at least it’s the entrance to that gorge. It’s all just a little bit complex actually. The left, eastern side of the hole in the hills is Irish Mountain. The right, western side is Jump Hill. The two of them combine to create a remarkable landscape form.

What is most interesting about it is that it seems to form an almost perfect semicircle. That may not be an accident. When I geologist sees such a perfect half circle in the landscape, he is very likely to think about the Ice Age and wonder if glaciers had not played a role in this. They very well may have. Let’s learn about what glaciers do in places like this.

 

When a glacier flows through a relatively narrow valley such as this one, it is likely to modify the landscape. The passing ice grinds away at the bedrock and wears it down. Given enough time – and with geology there is always enough time – the ice will carve a nearly perfect semicircle. It’s always the bottom half of the circle.

There is a reason that this shape develops. The semicircle is the shape that offers the least frictional resistance to the moving ice. The glacier will grind away at the bedrock, shaving off bits and pieces here and there, until it has achieved this semicircle. Then it will have exactly that minimum of frictional drag exerted upon it. It will, in fact, continue to wear away at the bedrock, but that wear serves only to deepen the semicircle, not change it in any other significant way. The ice can continue to flow for years, and decades and centuries. And that is what I was looking at from my Rte. 30 perch. I gazed to the south and, in my mind’s eye, it was many thousands of years ago, and the glaciers were still flowing down the valley.

This glacier is one that I know quite well. It is the Schoharie Creek Valley glacier. It entered the Catskills from the north and flowed south within the confines of the Schoharie Creek Valley.  It passed Middleburgh and flowed through Breakabeen. As it approached Grand Gorge it had a choice. One branch of its ice veered off to the east and continued, through Prattsville and on up the Schoharie Creek Valley toward Kaaterskill Clove. It would reach a location named “Mosquito Point” and there it would collide with another glacier coming from the east. That other glacier had entered the Catskills at Kaaterskill Clove and it had flowed through Tannersville and Lexington on towards its collision at Mosquito Point. The collision of two glaciers might seem like an unlikely notion, but they do occur. And that is the option that brought this branch of the valley glacier to an abrupt halt.

But that was only one option. The rest of the Schoharie Creek glacier flowed south through Grand Gorge and on into the East Branch of the Delaware River.  That is the flow of ice I had been watching. It was funneled though the Grand Gorge gap in the mountain and it was forced to carve that gap into the form that had so fascinated me. This glacier would continue on to the south. At Margaretville it would veer to the west and continue across what is the Pepacton Reservoir today. It would pass through Downsville and eventually, somewhere to the west, come to a halt, this time without colliding with any other ice.

As you can see, all this is quite a story. The great valleys of the Catskills all had their own valley glaciers. Each of them flowed mostly to the south and each of them carved their valleys into something resembling a semicircle. Had the Ice Age lasted longer in the Catskills, then all of the valleys would be perfect semicircles. This is commonplace in more heavily glaciated landscapes such as those of the Alps, but our Ice Age was just a little too short.

It is only in a few places that we can see those beautiful and striking semicircles, and the one at Grand Gorge is the easiest to visit. Some day let’s climb up into the mountains and see some other semicircles, some much better ones. Reach the author at titusr@hartwick.edu or join his facebook page “The Catskill Geologist.”

 

Remembering the ladies in Kaaterskill Clove – 4-6-17

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Remember the Ladies

Windows Through Time

Robert and Johanna Titus

The Columbia-Greene Media – June 3, 2010

I don’t think there are many of us geologists who are not very fond of the Hudson River School of Art. The artists of this “School” created America’s first ever national style of art. Starting right here in the Catskills, during the 1820’s, these landscape artists painted the American wilderness and they got it right. There is something in the spirit of their images that speaks directly to geologists. We feel what they felt when we are out “there.”

Not surprisingly, then, my wife and I have been active members of the Thomas Cole National Historic Site at Cedar Grove, Cole’s home in Catskill. Thomas Cole is widely thought of as a founder of the Hudson River school. Cedar Grove is dedicated to preserving his memory and to honoring the Hudson River artists in general. In its few years of existence Cedar Grove has established itself as a leading, even prestigious center of art scholarship.

Back in 2010 Cedar Grove has opened a new exhibit of paintings by Hudson River artists. That’s not unusual; they have done so every year since 2004, but this one was different. Called “Remember the Ladies,” it is devoted exclusively to the women artists of the Hudson River School. We didn’t want to miss it so we were there the very first day, and it was well worth the visit. About 25 works of art were on display, including some by Cole’s sister, Sarah, and daughter, Emily. But my wife and I best enjoyed one special canvas by Harriet Cany Peale, the second wife of renowned artist Rembrandt Peale.

Mrs. Peale painted in the Catskills in 1858 and her painting Kaaterskill Clove was chosen for the cover of the exhibit‘s 2010 catalog. It is a gem! We thought that we recognized the location where she did this work and resolved to go find the site. We thought it was just below Fawn’s Leap which you must pass by on your way up the clove on highway, Rt. 23A, just west of Palenville. You have to cross two bridges along the way and Fawn’s Leap is a waterfall just above the second bridge.

If you wish to visit where Harriet Peale did her painting the visit on a weekday morning before many people have yet arrived. There is distant parking uphill and downhill; nothing is available right there. Then walk to the bottom of that second bridge, the uphill one, climb down into the clove and then head upstream about 50 yards. There you will find a spot where a mountain cascade comes crashing down from above. Turn around right there and look back downstream. Like magic, you are transported back to 1858 when Harriet Peale was here. You are standing at the very spot where she worked and you can see what she saw – exactly what she saw.

There is a sense of kinship that this sort of experience brings. She and we came here for the same aesthetic reasons. We and Harriet Peale shared exactly the same sights even though we were separated by more than 150 years of history. The Civil War and two world wars have come and gone during this time. The electric light, the plane, the auto and the computer have all been invented, but this location has remained almost exactly as it was. We were just barely able to see the railings of today’s modern bridge and we could hear the passing traffic. But those were the only perceptible changes. In every other sense nothing has been altered.

But our sense of time was so acute here. We saw the great boulders that she painted and we were transported back to the end of the Ice Age. We understand the Ice Age history of Kaaterskill Clove and we know that, back then, a glacier had entered this clove and advanced up, all the way to South Lake. That glacier probably swept these boulders along with it. They are not just picturesque rocks; they are history, Ice Age history.  These boulders are called glacial erratics. They were plucked loose somewhere up the Hudson Valley and carried to this location by the advancing ice. After the glacier stopped advancing, it began to melt. As it melted away, these boulders emerged from the old ice. They were left at just this spot by the melting ice, and they have not moved an inch since that time.

And “that time” must have been no later than about 13,000 years ago. Now we stopped thinking of this place as it was during the Civil War; we saw it as it was when the pyramids were being built, and then during time much older than even that. We had developed a new appreciation for the scenery of the Catskills. For more about this summer’s exhibit at Cedar Grove go to http://thomascole.org  Find more at http://thecatskillgeologist.com

Brick Red Strata – 3-30-17

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That Brick Red Color

Windows Through Time

Robert Titus

Columbia Greene Media

Oct. 29, 2009

 

Red strata along road on Franklin Mountain south of Oneonta

 

The Catskills are among the most scenic regions in eastern North America. You already knew that, but one of the reasons is the brick red color of much of our bedrock. Look around and it won’t take long to find, here and there, a handsome outcropping of brick red sandstone and shale. The tint goes well with the green of the summer foliage and makes a picture perfect landscape. But, with so much of that red rock, there must be some cause, a reason for the tinting. There is and this week let’s learn about it.

The best place to begin to account for the color is to learn what causes it. Our brick red is the color of the mineral hematite, an iron oxide. The “hema” part of that refers to blood. Whoever named the mineral must have lived where there weren’t many bricks. He saw the color as that of blood. The is debatable; real blood has a much more intense hue of red than does hematite.  If I could have named it, I would have called it “brickite,” a silly name but a more descriptive one.

The iron oxide of hematite has the composition of Fe2O3 and it does, almost always, display a brick red color. In fact it is the mineral that does give bricks their color. The more iron in the brick’s clay to begin with, the more iron oxide that forms as it is fired. But we are not talking about bricks; we are speaking of rock. Hematite does not need to be fired in order to form red rocks. It typically forms in the soils of warm tropical terrestrial environments. When ancient soils are porous and well-aerated, then oxygen from the air can combine with iron to make the iron oxide rich red soils. Warm climates speed things up.

Tropical landscapes, in places such as the Amazon Basin and central Africa, commonly produce a red soil type which has been called a laterite. Other warm landscapes, all over the world, very often have red soils. You have probably heard of the Georgia red clays; these are home-grown versions. Where erosion cuts into any of these soils you can see the red hue.

But, somewhere along the line, I have to get back to the Catskills and why we have so many red rocks here. The answers take us back about 375 million years to a time when our Catskills were a great tropical delta. This was called the Catskill Delta and it was huge: the size of today’s country of Bangladesh which lies upon the Ganges River Delta. Our Catskill Delta lay in a tropical climate. Back then North America had drifted to about 20 degrees south of the equator and that put it squarely within the warmest climate belts.

The Catskill Delta probably had a seasonally rainy climate (some people debate this). One part of the year saw a lot of rain, the rest of the year was dry. The rainy season made our local soils chemically active, but during the dry seasons, they became parched. That’s when air got into them and that is when the iron oxides began to form. And, of course, that is when the soils became red, brick red. The Catskill Delta must have been a land of red soils and today our Catskills are a land of red sandstones and shales.

So, where is the best place to go and see all this? I recommend the drive up Rte. 23 as it approaches Windham from the east. Let’s take in the whole highway. Starting down in Cornwallville, there is a sequence of fine outcrops which extends for three or four miles along the highway. As you drive up the hill you are passing through about 1,500 feet of sedimentary rock, most of it is red. It is a fine sequence which speaks of the great size and thickness of the Catskill Delta deposits and it makes a most scenic want to take a good look, but you will be rewarded by the effort. Their coloration is wondrous. Once you have trained your eye to notice this sort of thing, it is good to keep the image in the back of your mind as you travel the region. Begin to notice how widespread the red strata are. Let each outcrop take you through a window of time, back to the time of the Catskill Delta. It is a great trip. Contact the author at titusr@hartwick.edu    Join his facebook page “The Catskill Geologist.”

A mystery at Olana – 3-23-17

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Mystery at Olana

Windows Through Time

Robert Titus

Columbia-Greene Media

Sept. 9,2011

 

Once again, this year, I will be doing a Hudson Valley Ramble at Olana (Sat. Sept. 9, 2017, at 10:00 AM).  My topic will be “Unplanned views at Olana.” It’s one of this year’s many Hudson Valley rambles. Olana is Frederic Church’s fabled Persian Revival home, perched high atop Church Hill, across the Rip Van Winkle Bridge from Catskill. Church, the great 19th Century Hudson Valley painter, built Olana and designed its 250 acres of landscape. He decorated the property with what are called “planned views.” Those are locations that were landscaped to enhance the scenic views that had already existed. These are grand panoramas of the Hudson River, the Catskills, and the Taconic Mountains. Church devoted all of his considerable artistic skills to developing these views and they are still, more than a century later, wonders to see.

I will take my participants to see several of these planned views, but my focus in not so much in seeing the modern landscape as in viewing images from the distant geological past.  We will “see” the glaciers that once overrode this hill and we will descend to the depths of the ocean that, so long ago, swept across this site. It’s a fun trek; I have done it many times and I enjoy it very much.

Olana has a rich and varied geological heritage and there is much to explore. But, at the same time, Olana can keep its geological secrets. One of them has defied all my best efforts. That is the mystery of where is the Olana pothole. Potholes are commonly seen in the bedrock floors of powerful rivers. Swirling currents of water pick up cobbles and gravel and sand and use that material to essentially drill a hole into the bedrock. The drilling continues until, in some cases, perfectly circular potholes, 25 feet or more deep, can be formed. These are commonly seen on many streams in the northeast. Many of them probably date back to the late Ice Age when melting glaciers provided vast quantities of meltwater. There is a well known example of numerous potholes at a location called Moss Island at Little Falls on the Mohawk River. It was designated a National Natural Monument in 1976.

Well, sometime back in the 1870’s, excavations were underway at Olana to recover stone for roads which were then being built. Accounts, written back then, indicate that those diggings occurred at the base of a 75 foot tall cliff of black shale. Workmen encountered a pothole that had lain buried, probably for many thousands of years. They reported the find to geologists and sometime thereafter excavations began in serious. After what must have been a lot of hard digging this pothole turned out to be eight feet wide and 25 feet deep. The walls had a polished appearance to them and, still within the hole, were polished and rounded cobbles, the very ones that had been swirled into the ground so long ago. It was an interesting discovery and several articles about it appeared in the scientific literature. Frederic Church appears to have been nonchalant with it all; he remarked in a letter that he was the proud owner of “a hole in the ground.”

The Olana pothole

Well, all this, of course, was of interest to me. How could it not? But the most pressing and immediate question I had was – where was the pothole? There were no precise directions in the articles about it. One said it was about a half mile from the Hudson River. The other placed it at 300 feet above sea level. Both placed it at the bottom of that 75 foot high cliff of black shale. I got out my map and altimeter and put on my boots and went hunting. But after a few hours of searching all likely places, I had come up empty. I don’t know what happened to the hole. It is always possible that it was destroyed by the quarrying activities of the 1870’s. Nobody else has found it either.

But I had some other problems to deal with. There are no bedrock stream channels here. I needed another explanation for the origin of this pothole. And that solution would take me back to the end of the Ice Age. All this conjures up quite an image of what it might have been like at the Olana site at that time. The Hudson Valley had been filled with the ice of a great glacier, but now it was melting away. I could imagine the remnant ice, abutting well up the slopes of Olana. Masses of water were pouring off of the melting glacier and a lot of that was funneled down a hole in the ice. It was that flow that bored the pothole. For me it’s a whole new “unplanned view” at Olana.

Reach the author at titusr@hartwick.edu Join his facebook page “The Catskill Geologist.” You might want to visit www.Olana.org

Robert Titus will be running a Hudson Valley Ramble at Olana at   10:00 AM on Sept 9, 2017.

He and his wife Johanna will be doing another Ramble at Clermont at 2:00 on Sept. 10, 2017.

Catskill floods and alluvial fans – 3-16-17

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Yellow alert

The horrible snowfall this middle March was bad enough but it sets us up for serious flooding.

If there is an intense all that snow will turn into floodwaters.

If there is a heavy warm rain storm it will only be worse

This happened in 1995 and it could happen again.

This 2012 Kaatskill Life article explains the problem

****************************************************************************

Alluvial fans, everywhere

The Kaatskill Geologist

Robert Titus

Kaatskill Life magazine

2012

 

Science, it is said, is self-correcting. Scientists have a reputation of being intelligent people, but that does not mean they do not make mistakes. That is why it is the nature of scientists to be skeptical; we always challenge established concepts and sometimes, not often but sometimes, we overturn them. This column has done something of this sort ever since Hurricane Irene struck the Catskills. The Catskill Geologist has long argued that many of our regional villages were safely perched up atop ice age features called alluvial fans. Rising often 25 feet or more above flood plain levels, it always seemed that such villages were far too high up for floods to ever reach them. Sadly, Prattsville proved this whole concept to be a false belief. It thus seems that it is appropriate – even necessary – to devote an article to the issue of alluvial fans and reevaluate the hazards associated with them.

I have gotten all the maps out, and looked through the Catskills in hopes of developing a much broader view on this issue. My thoughts have been developing as I have written several recent Kaatskill Life articles. Now it is time to summarize these into something scientists call a “synthesis.” I thought that it would be wise to start by identifying the best example of a fan anywhere in the Catskills. That turned out to be easy. It was the fan I first noticed decades ago. This emblematic alluvial fan is the one at Palenville, located at the very bottom of Kaaterskill Clove. A fan is called a fan because its shape looks like the sort of fan a lady would have carried back in the 19th Century. We can go to Palenville and see a splendid example (fig. 1) and come to clearly visualize an alluvial fan and how it formed.

fig. 1. Alluvial fan at Palenville.

   Kaaterskill Clove and its fan formed during the Ice Age, probably during one or more of the great melting events that terminated major phases of glaciation over the course of the last two million years. One likely time occurred about 130,000 years ago, at the end of the Illinoisan Stage of glaciation. For nearly 200,000 years North America had endured the advance of various ice sheets. These swept south and covered much of the continent. But now the climate was changing and the ice was finally melting away. We can only imagine how much meltwater was pouring out of the high peaks of the Catskills at that time. A lot of it came to be funneled into a canyon located where Kaaterskill Clove is today and this began the erosion that would create that great scenic wonder.  All this was likely repeated about 14,000 years ago when the younger Wisconsin Stage of the glaciation came to an end.  Again, enormous amounts of meltwater must have poured out of the mountains and down the growing clove. Thus there were possibly two great episodes of glacial meltwater pouring out of the mountains. These resulted in the creation, deepening and widening of Kaaterskill Clove to its present state.

But, there is more. You have to understand that where today there is the empty space of a clove, back before the Ice Age there had been bedrock. Stand at a location like Inspiration Point, towering above the clove, and imagine all that space below you having once been filled by bedrock. Think of how much meltwater was needed to erode away all that rock in order to create the clove. It’s an awesome notion. But – all that eroded bedrock has been turned into sediment – where did all the sediment go?

 

Fig. 2. Alluvial fan at Palenville.

   We can actually go and see that sediment. If you have the opportunity to fly south along the Wall of Manitou, the Catskill Front, then you can see it. That sediment makes the Palenville alluvial fan (fig. 2). The Palenville fan has its highest elevation right up at the mouth of Kaaterskill Creek. It displays a gentle incline, sloping to the east and “fanning out” from the mouth of the creek. You can get a closer look at the fan deposits while driving up Rte. 23A in the clove itself. Just downhill from Fawn’s Leap a heap of these sediments are visible down at the bottom of the canyon (fig. 3).

 

fig. 3. Alluvial fan sediments in Kaaterskill Clove.

   We learn a lot about the origins of alluvial fans at Kaaterskill Clove, but not much about their flood threats. Palenville was established and built on its fan, but it has never faced any serious flood problems for reasons that we will have to deal with soon. Let’s learn more by looking at some other towns lying upon other alluvial fans. Naturally the place to start is at Prattsville.

 

fig. 4. Prattsville and its alluvial fan from air.

   Prattsville (fig. 4) had its origins way back at the end of the Ice Age. There was a moment in time when this stretch of the Schoharie Creek Valley was at the bottom of something called Glacial Lake Grand Gorge (light blue on figure 5). That lake flooded the valley, but only temporarily. It owed its existence to a glacial dam, far to the north, and when that ice dam melted, the lake drained.  This stretch of the valley became dry, with only an early version of Schoharie Creek flowing through it. But Huntersfield Creek descended the slopes above and it, like Kaaterskill Creek, brought sediment with it. Soon an alluvial fan formed (fig. 4 & yellow on fig. 5).  It was much smaller than the one at Palenville, but it did serve as a location for the establishment of another town. It is easy to imagine pioneers arriving at the Prattsville site and deciding that this was the place to build a town. After all the land, here, rose a good 25 feet above the level of the river. They must have thought that they would never EVER have to face a flood.

fig. 5. Alluvial fan at Prattsville

   There is a real irony here. What attracted settlement was a supposed safety from flooding. In reality that safety was an illusion. The alluvial fan, which should have elevated Prattsville above the flood, instead made things worse, much worse. Look at how wide the blue part of the valley south of town, which is upstream. Now look at how narrow the valley floor is adjacent to Prattsville. As it passed by Prattsville the flow was impeded by the alluvial fan. Water, from behind, shoved it forward. The flow was squeezed and forced to rise up and flood into town. I am making an analogy to the garden hose. When you squeeze its nozzle its power increases. You are only washing a car, but Schoharie Creek, with its fan, did much the same in destroying a town. I call this the “garden hose hypothesis.  I am arguing that it should be applied to all of the Catskills. We found exactly the same when Johanna and I did an article about Margaretville (Kaatskill Life, spring 2012). This town too, was established upon an alluvial fan. Exactly the same garden hose effect helped damage that town.

Since these revelations occurred it has become critical to take another look at all the towns and villages of the Catskills and see if the same threats can be found. They can, and this needs to be understood. What happened in Prattsville may serve as a model for all of the Catskills. Let’s look at Middleburgh (fig. 6). It was badly flooded by Irene and now we can understand why. Most of Middleburgh, like Prattsville, lies upon an alluvial fan that partially blocks the Schoharie creek Valley. To make things worse there is another, smaller fan across the valley (fig. 6).When the floods arrived, the garden hose effect caused rising, squeezing, and speeding up of the waters; the town suffered grievously.  So too was the effect of an alluvial fan at the town of Schoharie. There another fan, lying just north of the town, impeded the flow of the Schoharie Creek. That “squeezed the hose” and flooded the town.

fig. 6. Two alluvial fans at Middleburgh

 

Windham, at first looked like an exception. Here the valley of the Batavia Kill appears to be too narrow for an alluvial fan, but something akin to one did form here. I was puzzled by Windham; there was no fan there. But I found that, back in the 1930’s, geologist John Lyon Rich had solved the problem for me. He found that Mitchell Hollow Creek, which flows south into Windham, had an interesting history. Back in the Ice Age, Windham lay at the bottom of a glacial lake. Mitchell Hollow Creek flowed into the lake and deposited a delta into its waters. The top of a delta is flat and elevated. Like the alluvial fans, it attracted development, and all of Windham is built upon it. But Batavia Kill was forced to carve a small but narrow canyon through that delta (fig. 7), so the delta behaved like a fan during Irene. Waters were squeezed by the delta sediments; currents were raised and speeded as they careened through Windham, hence the awful flood that occurred there. Windham, like Margaretville, has a long history of flooding; now we understand why.

fig. 7. Batavia Kill at Windham

 

But now we must look farther, to towns that did not suffer from Irene. There, the floods did not hit, but the threats remain. Let’s look at Delhi, the subject of another “Catskills Geologist” article (Summer, 2011. It is a two alluvial fan town (fig. 8). What would happen to Delhi if very heavy rainfall fell upstream from it, say at Stamford? The garden hose hypothesis would bring a horrible flood into that town.

 

fig. 8. Two alluvial fans at Delhi

   Then there are Milford and Laurens (fig. 9), in the western Catskills. Each is perched upon a similar fan and each would face certain flooding if only enough rain fell upstream from them. These towns did not suffer the fate of Prattsville because it did not rain enough upstream from them. There are good reasons why we might think that such heavy rain might never occur on this stretch of the Susquehanna, and so those towns may be safe. The heavy rains of Irene were associating with a weather pattern that climbed up and over the steep topography of the Catskill Front and that is a real rain generator. No such obstacle is found near these other villages, and so it is not obvious that such an awful event could occur near them. But . . . Nature loves to surprise us.

 

fig. 9. The alluvial fan at Laurens.

   It gets worse. Cooperstown is built upon still another alluvial fan and this one stretches across almost the entire Susquehanna Valley (fig. 10). It nearly blocks that valley and that is what happens when you really put your thumb on the nozzle of a garden hose and squeeze it. That has left a very impressive canyon for the Susquehanna to flow through (fig. 11). The top of the Cooperstown alluvial fan rises about 60 feet above the river and it will be very difficult for flood waters to ever rise that high. But what if there is a very, very heavy rain just off to the north. Suddenly enormous amounts of water would be squeezing into a very narrow canyon. It would be expected that those waters would quickly climb the walls of that canyon and . . . then what? The Bassett Hospital complex lies at the top (fig. 11). All this is nearly unimaginable; it’s just nearly impossible for such rainfall to occur, but “nearly impossible” is not impossible.

fig. 10. Alluvial fan at Cooperstown.

The purpose here is not to promote horrible fears. Instead the purpose is to rationally come to understand what potential flood threats there are in our region. Many of our villages were constructed upon alluvial fans. They date back to times when nobody event knew what such a fan was. They just seemed to be logical places to settle, apparently safe from flooding. The problem is that Prattsville has shown us otherwise.

 

 fig. 11. Susquehanna River at Cooperstown. Bassett Hospital Complex on left.

   I do not propose that we dismantle Delhi, or Milford or Cooperstown. But, I do argue that we should understand the nature of the landscapes we live upon. They can offer us dangers we never dreamed of and we should recognize those dangers. Many climate scientists fear that powerful storms, like Hurricanes Irene, Lee, and Sandy, will become more commonplace. If they are right then there is much to fear: hazards such as we have never faced before. My message is mostly aimed at zoning boards. They should realize that there are places where homes and other buildings just should not be located.

Hyde Park Delta – revised 3-9-17

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 The Hyde Park Deltas – Part one                                     Thecatskillgeologist.com

Robert and Johanna

 March 2016

Most of the time we are re-running old newspaper columns on this site. But we expect to do some original work as well. That is the case here today. We are publishing the first half of a study we recently did on the geology of the Hyde Park ice age deltas. We hope that you will be able to go to Hyde Park and see what we have seen.

This is a new revised version

                                                             ______

The town of Hyde Park is built upon a broad flat platform. It’s a natural landscape feature and it needs to be understood. When you drive into the town, we want you to take note of it. From the north, you pass the Vanderbilt Estate with its endless front lawn. Then the highway passes through the urbanized part of the town. That area is just as flat. Farther south is the Roosevelt Library and Museum. See its expansive and, again, very flat grounds. All this flatness begs to be understood. There is a pattern here, and we always say “when Nature presents scientists with a pattern, she demands an explanation.”

We like to bring a barbeque skewer along with us wherever we go. When we want to investigate this sort of flatland we try to drive it into the ground. If there are rocks, which there usually are, we have little luck. But – if the skewer slides in easily – then we have likely found a glacial lake bottom. That is the case at Hyde Park. Take a look at our map. All the yellow is flatland where there are few, if any, rocks in the ground.

Yellow on map is delta flatland. Base map courtesy of US Geological Survey

   But, is this a simple lake bottom or is there more to the story? Notice that, on our map, the yellow flatlands lie at the downstream end of a stream with the unlikely name of Crum Elbow Creek. Long ago, glacial geologists recognized that that all these flatlands comprised an ice age delta, sometimes called the Hyde Park Delta, the delta of Crum Elbow Creek. The New York State Museum map of ice age features actually portrays two deltas here, one north of Crum Elbow Creek, with a second and larger one, just to the south. This is important, and we should name the two deltas. Let’s call the northern one the Vanderbilt Delta (brown) and call the other the Roosevelt Delta (yellow).

Roosevelt Delta in yellow; Vanderbilt Delta in brown.

   Back during the Ice Age, there was a sizable lake flooding all of this part of the Hudson Valley. It has been called Glacial Lake Albany. Crum Elbow Creek is a long flow of water and, back then it was likely carrying a lot of sediment. Most of that sediment was deposited as the delta where the creek flowed into Lake Albany. The top of a delta is always flat and it roughly corresponds with the old lake level. That’s called the topset of the delta. That would have been at about 180 feet in today’s elevation.

The front of a delta is typically a steep slope called a foreset. That explains another landscape feature that we see throughout Hyde Park. Take a look at our photo from the Vanderbilt mansion. The mansion was located at the top of the steep foreset slope. That offered the Vanderbilt’s a nice view of the Hudson River. Walk north and south from the mansion and enjoy this view.

 

The Vanderbilt Mansion from the south. Below it is the foreset slope.

 

Foreset slope, north of the Vanderbilt mansion, with its view of Hudson.

Now we have learned a lot about Hyde Park. You are not likely to be able to pass through town without envisioning yourself in a very different landscape, an ice age one. With your mind’s eye look west and see Glacial Lake Albany spread out before you. It extends all across the Hudson Valley. The lake was almost two miles wide here. That’s about four times as wide as today’s river is.

But, the more we worked the area, the more we saw problems that needed to be explained. For starters, we thought the flow of Crum Elbow Creek was a bit odd. The stream has its head about ten miles north of Hyde Park. It flows in a remarkably straight line, just a little west of south, all the way to Hyde Park. Much of the way, it follows Rte. 9G. But then, at the village of East Park, it turns sharply to the west and flows directly into Hyde Park and, from there, into the river (see our maps).  Back during the Ice Age, that took it right into Glacial Lake Albany. We wondered if there was a story to that sharp westward turn. We are scientists; again, we are supposed to wonder such things.

Then it began to bother us that Crum Elbow Creek did not match the delta all that well. It certainly did a good job of explaining the northern part of the delta, the Vanderbilt Delta. But how was it that the delta spread out so far to the south? How could delta sediments extend a full two miles, south of Crum Elbow Creek? In short we just did not think that Crum Elbow Creek was accounting for the Roosevelt part of the delta complex. Again, we are scientists.

That’s when another problem appeared. We were now looking more carefully at the map and we suddenly noticed that, while there were two deltas at Hyde Park, they were also of two different elevations. The Roosevelt Delta, south of Crum Elbow Creek, had a topset at about 180 feet in elevation, but the Vanderbilt Delta, north of the creek, lay at just about 170 feet. We were, clearly, looking at two separate events.

This is when it started getting exciting. We soon had a flash; all of a sudden we saw what had happened, and that was a genuine epiphany. We will be back next Thursday with the solutions to these problems, but in the meantime we want you to have a chance to ponder them, and see if you can come up with the solution yourself. We leave you with a blown-up version of our map, focusing on the southern part of the Roosevelt Delta. Take a good look

  Do you have some ideas? That is , before you read the second column – just below.

Close-up of the southern delta.

 

 

 

 

       The Hyde Park Deltas – Part two

thecatskillgeologist.com

Robert and Johanna Titus

March 2016 revised version

_____

This is the second of two new articles about the Hyde Park deltas.

 

   Last time, we began investigating the Hyde Park Deltas. These ice age features have been recognized by glacial geologists for decades and they are seen on the New York State Museum’s map of New York State glacial geology. That map recognizes two deltas.  But we have found something remarkable and, we feel, revealing. Those two deltas represent two chapters of delta formation. That needs to be explained. So – we are going to, herein, record the sequence of events that we have deduced to, we hope, explain all this. We are, in short, going to record a sequential history of the formation of the Hyde Park Deltas – and thus Hyde Park itself.

1) It all began sometime close to the end of the Ice Age. The Hudson Valley glacier had been melting and vacating the valley, and it left behind a sizable lake. That has long been recognized as Glacial Lake Albany. The lake stretched across the Hudson Valley and, at Hyde Park, it was nearly two miles wide.

   2) Crum Elbow Creek was flowing south by southwest, east of, and parallel to, the lake. This took it across a newly deglaciated landscape. We suspect that, at least at first, it was a far more powerful stream than it is today. It does not amount to much today, but back then, it may have been swollen with very dirty meltwater. It, we think, it (must) have been a very erosive stream.

 

Crum Elbow Creek today, upstream.

 

3)  If so, then Crum Elbow Creek had to have carried a very substantial load of sediment which came to be deposited in Lake Albany. Most of that sediment formed what we are calling the Roosevelt Delta (see yellow on our map). The waters of Lake Albany, at that time, reached a level of 180 feet in modern elevation. The delta’s topset was, likewise, at today’s 180 feet.

The Hyde Park deltas; Roosevelt Delta in yellow; Vanderbilt Delta in brown.

 

4) We conclude that, back then, Crum Elbow Creek did not turn sharply to the west as it does today. Instead, it continued its southwest path which took it past today’s Wallace Center and onward, just a little north of the Roosevelt mansion, Springwood. Its old channel can still be seen adjacent to the parking lot at the Wallace Center (see map and see photo). This is the time when the stream deposited the Roosevelt Delta (again, see our map).

“Old” Crum Elbow Creek, highlighted in red. “New” Crum Elbow Creek (blue) extends off to the west.

 

Now dry channel of “Old” Crum Elbow Creek, just north of Wallace Center. “Old” Crum Elbow Creek once flowed at the bottom of this small valley.

 

   5) Next, there came a time when Lake Albany (suddenly?) drained down to a level of 170 feet. We do not know why, but with that lowering, a remarkable event ensued. A small stream, one that had just begun flowing along the northern edge of the Roosevelt Delta, became quite erosive and, by headward erosion, it worked its way up along that northern flank of the Roosevelt Delta. Stream piracy was now occurring. The path of this stream, “New” Crum Elbow Creek, can be followed along East Market Street (aka County Route 41). It can be seen that this stream had been erosive enough to cut down into the bedrock there (see our photo) and create something of a canyon.

East Market Road follows canyon of “New” Crum Elbow Creek. The creek is just out of sight on the far right; it presumably cut the steep slopes of this canyon.

 

6) With time, this growing creek would intersect “Old” Crum Elbow Creek and divert its waters into the present-day path of “New” Crum Elbow Creek.  Also, a new delta, our “Vanderbilt” Delta, began to form. This younger episode of delta building apparently did not last as long as the previous one, and the new delta never got to be as large as its predecessor. The old Roosevelt Delta leveled off at 180 feet; the new Vanderbilt one at 170.

7) During the period of stream piracy, “Old” Crum Elbow Creek continued flowing in its old path. But that path was about ten feet higher above the new level of Lake Albany. This higher level promoted active erosion of the “Old” Crum Elbow channel. This old channel is the one visible just north of the Wallace Center parking lot. More of the old channel can be traced through Hyde Park.

 

More channel of “Old” Crum Elbow Creek (left center) on the Yellow Trail at the Winnakee Nature Preserve, just north of Rte. 9.

 

8) After stream Piracy was complete, the “Old” Crum Elbow channel was left high and dry as is seen at the Wallace Center today (our photo, above). Another dry channel can be seen immediately north of the old Roosevelt family stables. (See our photo below). That had been a tributary of Old Crum Elbow Creek.

Dry canyon of a tributary of Old Crum Elbow Creek, just north of Roosevelt family stables on the Cove Trail.

 

Sometime later, Lake Albany dropped the remaining 170 feet, down to its present level. Today’s “New” Crum Elbow Creek came into its modern form by eroding those 170 feet. This is best seen where the bridge crosses the creek at the south end of the Vanderbilt Estate.

 

Crum Elbow Creek at the Vanderbilt Estate.

We believe that this history accounts for pretty much all the landscapes we see, today, at Hyde Park. It is an account that describes the very origins of Hyde Park itself and is thus a fascinating history. We invite you to tour the town and see the geologic sites that we describe here. Then, take Rte. 9, north and south of Hyde Park, and see what the vicinity would have looked like if the deltas had never formed.

We have long been impressed with how ice age events explain so much of what we see in our scenic Hudson Valley. This is a fine example.

Elephant’s Graveyard – 3-2-17

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Elephant’s Graveyard

The Greenville Press

Oct. 3, 2002

Updated by Robert and Johanna Titus

randjtitus@prodigy.net

 

 

   The Hyde Park Mastodon on display at Paleontological Research Association in Ithaca

 

In recent years there has been a small flurry of discoveries of ice age elephants in New York State. You may well have read about the mastodon discovered in Hyde Park; it made quite a stir down there. The bones were found quite by accident in a small pond in the family’s backyard. All they had wanted was to enlarge that pond, what they got was an ice age treasure. Researchers spent the summer of the year 2000 excavating the skeleton and most of it was recovered. Such events are very exciting and people come from all over to see the bones as they emerge from the muds. Some even got involved in the project, there is never a shortage of local volunteers to help out in this sort of dig.

Excavation of farm pond

Less well known was a similar discovery near Ithaca, the year before. Another swampy area yielded the bones of an ice age elephant. This one were parts of a woolly mammoth, and this dig attracted dozens of Cornell students. A big surprise awaited them when, during the excavation, the remains of a second skeleton, this one being another mastodon, came to light. You can imagine the excitement that accompanied this “twofer.”

Such discoveries are always big news stories in the local area. They should be; they are rare and exciting events. But, during the eighteenth and nineteenth centuries very many more such discoveries were made. In those times it was common for farmers to drain their swamplands and this frequently led to the discovery of large bones. The Hudson Valley of New York State became something of a world capital for mastodons, as these relatives of the modern elephant were apparently very common here, especially in Orange County in the lower Hudson Valley.

Excavating mastodons in Orange County in early 1800s

Painting by Charles Wilson Peale

 

The hunting has not been nearly as good in the upper Hudson Valley, but some very historic finds have been made there. What may surprise you, as it did us, is that Columbia County was the very first place where a mastodon was ever found.  This story takes us all the way back to the year 1705. That’s when a mastodon tooth was found by a Dutch tenant farmer in what was then called Claverack Manor, which may well be Greenport today. Spring floods washed it out of a bluff, about 60 feet above the Hudson River. The remains were fragmentary, but they impressed the English colonists of the time. The big find was a tooth that weighed five pounds.

Today, such a tooth would be quickly identified as belonging to a mastodon, but back then nobody knew of such animals. There was great debate over just exactly what kind of creature had possessed such a large tooth. Lord Cornbury, then the English governor of New York, pronounced it to be from a human giant. His interpretation was greatly influenced by his religion. Genesis stated that there “were giants on the Earth in those days” and Cornbury thought this had been one of them. He sent people to search the site again and soon a fair number of very decayed bone fragments were discovered to go with the tooth. The corpse appeared to have been 30 feet long. A single thigh bone seemed to measure 17 feet. Those numbers were badly in error.

There were others who thought that the remains must belong some sort of animal or even a fish, but they could not tell just what kind. Congregationalist minister Edward Taylor was the first to suggest that the animal had been an elephant. But what kind of elephant? Back in the early 1700s nobody understood the concept of extinction and so nobody was going to suggest that the Claverack Giant was anything other than a modern form and there are, of course, no living wild elephants in New York State

Edward Taylor had other ideas however. He thought that there might have been some thoroughly un-Christian giants. He cited Indian legends of ancient human giants. They had been as tall as trees and hunted bears. But, to profess pagan Indian myths was not wise in eighteenth century New England, and these views were best kept to himself.

In 1706 some more mastodon remains were found and these were shown to Massachusetts Governor Dudley. He thought that they were the eyeteeth of a human, and he added the notion that the specimen had been a victim of Noah’s great deluge! His acquaintance, the influential Puritan Cotton Mather, of Witch Trial fame, embraced this notion enthusiastically. Despite his association with witch trials, Mather was something of a naturalist and, in his theology, he sought to focus on scientific rationalism. He saw the Claverack giant as empirical proof of the Biblical story that there had been giants living in the pre Deluge Earth.

It is true that there are some resemblances between the human molar and the mastodon’s tooth and, back then, little was known of fossil elephants, but Dudley’s opinion is still just a little hard to understand. As the decades passed, other mastodons were found from time to time.

Dudley’s speculations had long faded into history by 1838 when parts of another mastodon were found across the Hudson River in Greenville. This was, at the time, considered an important discovery. New York’s famous paleontologist, James Hall, brought along the even more famous English geologist, Charles Lyell, to visit the site in 1841.

It wasn’t long before another mastodon turned up in Greenville. A partial skeleton was found somewhere along Rte. 32, maybe about a mile south of Greenville. This was within a “small swampy depression” on the farm of Charles Coonley. It is not clear exactly what was found here and the bones seem to have become scattered, but it appears that a number of bones, perhaps from several elephants, came to light. This was long before careful excavations were done and so this discovery will probably never be well understood.

A few more Hudson Valley mastodons would come to light during the next 160 years, and we still think that there are more waiting to be found. These discoveries have been made mostly in the sediments of old glacial lakes and there were a lot of those in the Hudson Valley, in fact most of the valley was once a single great glacial lake, called Lake Albany.

After the Ice Age ended, those lakes generally drained, and a large number of pools and wetlands were left behind. If you travel around the Hudson Valley area you will see these in abundance. Some of those wetlands have been dammed to create artificial ponds, but many of the pools and all of the swamps are natural.

As the glaciers melted, forests gradually invaded our vicinity. The forests attracted mastodons. These animals fed on the vegetation and apparently enjoyed living among the trees. Mastodon teeth seem adapted for gnawing such foliage. Mammoths, on the other hand, were apparently better fitted for life on the bleak and barren tundras. They would have avoided forests. The whole post ice age Hudson valley was forested and populated by many mastodons but probably no mammoths.

We must do a lot of speculation as we consider the skeletons that have been found. The typical fossil mastodon is a young bull. Young males of most species are reckless and foolish so it is so easy to imagine many of them wandering out into small ponds in a quest for pond weeds. The sticky muds at the bottoms of these ponds seem to have trapped many of these poor creatures Elephants are bright animals, but they don’t rescue each other. Getting stuck would have led to a likely death and eventual preservation as a fossil skeleton in the pond sediments. As the millennia passed, the ponds turned into swamps and, in time, some of the skeletons were discovered. People dredged their swamps with the purpose of creating farm ponds and encountered the sleeping giants of long ago.

 

    Skeleton of mastodon buried in ice age lake deposit.

What we find so interesting about all this is that everything we know about this tells us that there are still a lot of undiscovered mastodon skeletons around here. Any swamp or pool of water is a potential hiding place for a mastodon, and there are a lot of swamps and pools.  And make no mistake about it, a lot of mastodons died in a lot of those old ponds. They are still there to be found.

Finding a mastodon is not easy, it requires luck, but it also requires that people know what to look for. Typically, somebody needs to make an excavation and that work cuts into the old muds. Large bones are found, but too often people dismiss them as being cow or horse in origin. It’s often the case that the significance of such discoveries is only understood when the tusks of the mastodon are found. It’s pretty hard to confuse tusks with the remains of a cow!

So, what we are saying is that if you have seen some large bones in a local excavation, it is time to take another look, you might have found the bones of an ice age mastodon and that should be known about. Good skeletons are worth a lot of money too. We are told that a complete skeleton is worth about $50,000. We are also told that it costs a lot to properly excavate one: you guessed it, about $50,000.

If you want to learn more about the history of American fossil mastodons, please read the book “American Monster” by Paul Semonin.

 

The Birth of Manorkill Falls 2-23-17

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The birth of Manorkill Falls

Windows Through Time

Robert Titus

Columbia Greene Media

Nov. 4, 2010

 

A lot of our Catskills landscape is owned by the New York City reservoir system and is administered by the city’s Department of Environmental Protection (DEP).  You can pretty much always tell where these lands are; the roadsides are festooned with no admittance signs. They will let you in if you have a proper fishing permit but, if you don’t, they will chase you away. I should know! But, even if most of us cannot get in, not everything is out of sight. One good example is Manorkill Falls. It’s located on DEP property, but it is still visible from the highway (Schoharie County 39, AKA the Prattsville Road). A highway bridge crosses the Manor Kill itself and you can park, walk out on it and see the falls. The upper falls are visible on the upstream side and, just below the bridge, and almost out of sight, are the lower falls.

 

The local stratigraphy accounts for the two falls, or so it would seem. They tumble over sturdy and resistant sandstone ledges. But, when I visited, I thought there must be more to it than that.  I looked at the upper falls, then crossed the road, looked down and to the west. I pondered the origins of these falls. When a scientist is faced with a problem and spends some time thinking about it, then he or she is likely to come up with possible solutions. We call these potential solutions “hypotheses.” That’s a fancy name for educated guessing, but it is an important step in the “scientific method” of problem solving.

Off to the west was the Schoharie Reservoir and it lies quite some distance below the falls. I wondered about that as I began to do some serious hypothesizing. I knew that there had once, long ago, been a sizable glacier down there. In my mind’s eye I could see it. It had slowly advanced south from the Mohawk River Valley and filled the entire Schoharie Creek valley, passing through Middleburgh and Blenheim. From there it would continue past Prattsville, almost reaching Hunter. That’s a lot of ice and a big glacier. I was watching it passing north to south, which was my right to left.

What a vision I witnessed! The glacier was mostly gray except where fresh snow lay. It was fractured by great curved crevasses, all of them reflecting the stresses that build up within brittle ice as it moves forward. Above it, the hills were bare; there were no forests in this ice age vista. My vision was a brief one, when I looked again, it was autumn and the season’s dense foliage displayed its rich leaf colors. It was the very same view but at a very different moment in time. Geologists are such sightseers!

This large Schoharie Valley glacier would certainly have been a very erosive phenomenon. It must have, as it advanced, cut into the Schoharie Valley floor, deepening it and widening it. I realized that this would give me some more help in my effort to explain Manorkill Falls. I looked west once again and, in my mind’s eye, I watched that glacier more carefully, as it slowly passed before me. It was, indeed, erosive and it did work to carve the sizable valley that eventually would form the basin of the Schoharie Reservoir. As such a glacial valley, it was, in fact, steep walled and deep. That helped me some more. I looked to the west and saw that deep valley under the waters of the modern reservoir. Then I turned east again, returned into the past, and saw a post ice age stream emerging from that direction. That stream would have been forced to tumble down the steep valley walls to get to the bottom of old Schoharie Creek Valley. I was looking at the earliest origins of Manorkill Falls.

Now I put together a more complete story. That Schoharie glacier had first advanced down the valley. It deepened and widened it, but mostly made its slopes steep. The ice filled the valley for a very long time but, eventually, the climate warmed and the ice began to melt back to the north. A sizable lake replaced the glacier. Its waters filled the valley, matching in so many ways the view of the reservoir, the one we see in modern times. That old lake must have been ten time larger than the modern reservoir!

It was about then that Manorkill Creek came to be born. That creek began to flow out of the valley to the east and it was forced to tumble down the newly formed steep slopes of the greater valley. Today’s canyon, behind Manorkill Falls, is deep and speaks of a very strong flow of water, way back then. You can see it as you drive east toward Conesville on Rte. 990 V. I pulled over and got out. I watched, and felt, the flow rising in this canyon. Soon it was a far more powerful and even thunderous flow than we see today. Raging, foaming, pounding torrents raced by. Below all that whitewater, the flow was carving the modern canyon. I, the geologist, had been privileged to go and see its birth. You can go there and do the same.

Reach the author at titusr@hartwick.edu. Join his facebook page “The Catskill Geologist.”

Dam Concerned Citizens: another form of protest. 2-16-17

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A Different Kind of Protest

On the Rocks

Robert and Johanna Titus

The Woodstock Times

Jan. 22, 2015

 

Perhaps you have read the news of the recent rehabilitation of the Gilboa Dam at the Schoharie Reservoir near the village of Gilboa. The city of New York, which owns the dam, has been spending hundreds of millions of dollars to upgrade its structure and to render it ready to survive any potential future flood events. It is said that the dam is now engineered to endure a flood two and one half times worse than the one it survived during Hurricane Irene, just a few years ago. That’s a big win for a local civic group named “Dammed Concerned Citizens” (DCC). But, it is also a big win for New York City. That’s our story today.

This story began about ten years ago when an engineering report found that the dam did not meet “. . . safety standards associated with modern engineering practices . . . “. These understated words set off alarms. People were aware that there had been a surprisingly large number of “hundred year” floods in the recent past. Such floods had struck in 1955, 1987, and 1996. Now they feared that the impact of one more awful flood would cause the dam to lurch forward, just a bit, and then give way altogether.  The threat was truly frightening; after all, almost 20 billion gallons of water were pressing against the aged dam. People couldn’t help but to imagine the dam fracturing and breaking up, as masses of water burst through it, and exploding into the valley below. The result of such a total destruction would be a tsunami, rushing for hours down the Schoharie Creek Valley. The horrible wave would pass across Middleburgh and then Schoharie. It would continue into the Mohawk River Valley and then turn east, heading for Schenectady. It was estimated that some 8,000 people might lie in the path of this deluge. Read all that again – slowly –  and just think about it for a moment!

The Gilboa Dam had been constructed during the 1920’s, so it was, by then, a little more than 80 years old. It was, reportedly, designed to last only 50, so it was old. Below the dam, the spillway had seriously deteriorated, with holes eroded into its cement by decades of plunging waters. The bedrock beneath was cut by numerous fractures. The face of the dam itself had been weathering, over all those decades, until it was reported that about seven percent of the original structure had been eroded away. It all looked unstable; it all looked dangerous; it was, all of it, neglected.

The long and the short of it was that any sizable flood might take out the whole dam and result in thousands of horrible deaths. It was estimated that if waters rose to 1,138 feet in elevation, then the pressure would be so great that the dam might just let go.  Dam Concerned Citizens was damned concerned!

Imagine for a moment that we are talking about an old dam, and an old reservoir that lies along the Saw Kill, a bit upstream from your Woodstock, How would you react? We monitored some of the internet chat about all this and found a lot of people felt vehemently that the Gilboa Dam should just be drained and shut down. Close it and be done with it! We are guessing that a lot of you would band together to form something called CDD, “Close the Damned Dam.”

But the people of Schoharie County are not like that. They took a more pragmatic approach. It was not reasonable to demand a closing of the dam. There would be no “occupy Gilboa” here. They would come up with a different sort of protest, a softer, quieter, but unrelenting protest. They aimed at an achievable goal, of infrastructure improvement, aimed at maximizing the safety of the dam.  They knew how important New York City is to the whole of the state and its economy. And they rather thought it would be better to fix the dam than close it. A closed dam would benefit them, but a fixed dam would help everybody.

But they were under no illusions; they faced very serious hazards, and they understood that fact. Lives were, after all, at stake.  Dam Concerned Citizens went to work. They opened a website, which became a public advocate on issues of regional dam safety. For these reasons, they recruited experts on dam engineering and stream flow. They never confronted New York City or its Department of Environmental Protection (DEP), but always kept up a conversation. They quietly, even softly, maintained a pressure to get things going. And they continuously monitored what was going on. Their experts were always quite able to judge whether or not things were being done right.

We, who drive by the dam frequently, began to notice that things were happening. A five foot deep notch was cut into the top of the dam; it would make it very hard for water to rise to that fearsome 1,138 foot level. Siphons appeared; they would drain the dam if things got dicey. Importantly, time had been purchased. Later the dam face was worked on and restored to a youthful appearance – and function. The dam was being fixed. And DCC was closely following the progress.

Gilboa was far enough along, so that when Hurricane Irene struck in August of 2011, it held. There were, indeed, very frightening moments on that very frightening day, but the dam stood firm. Since then, it has only gotten better. And, just recently, the dam has been declared safe. An observance was held, and waters from the reservoir were ceremonially poured onto the dam face. Members of DCC were present.

It could have been so different. DCC could have dug in its heels, resolving to shut down the dam and its reservoir. And maybe they could have pulled it off. But that would have deprived New York City of one of its major sources of fresh clean water. What would have resulted from that? It is probably very good that we will not find out. But there is something else. The city is world famous for the high quality of its water and it is from the Catskills that most of it is derived. Catskill residents take quiet pride in being the source of that water. They want that to continue; they are good neighbors.

We won’t be subtle in stating that the two of us support everything that DCC has done. But, there are lessons to be learned here: First, it is better for parties, with problems like this, to work together. More importantly, it is even better to have a can-do attitude, and to work to solve those problems in a way where both sides come out winners.  Perhaps Schoharie County residents could have been the sole winners – had they really wanted that. But they resolved to find a different kind of protest.

Contact the authors at randjtitus@prodigy.net. Join their Facebook page “The Catskill Geologist”

 

The stream at the top of Kaaterskill Falls 2-9-17

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Top of the falls, bottom of the river

Windows through time

Robert Titus

 

Kaaterskill Falls is one of the scenic centerpieces of the Catskills. To stand atop these falls and to gaze out at the gorge below is a grand Catskills experience. The stream which makes the falls can, at times, be a powerful flow. This is the creek that drains North and South Lakes so it witnesses a lot of water flowing by. Sometimes it is a thunderous and very loud flow that tumbles over the falls. That adds to the experience. People have been coming here for almost two centuries now. Many have left the names or initials carved in the rocks here. The oldest inscription in the rocks that I have seen carries the date of 1810. Thomas Cole did some of his early work here.

But I am a geologist and when I am at the top of the falls, which is often, I see inscriptions that Nature herself has left here. And these are a lot older, hundreds of millions of years older. I know how to read those inscriptions even though they are not in English.  And when I read the rocks I see into them. I see not just one stream here but two. And both of those streams are flowing in the same direction and their two channels are almost identical in size. Left banks match left banks; right banks match right banks. But that second stream is as old as the rocks themselves, perhaps 375 million years old. You might dismiss my observations as tainted by hallucinations but I am quite literal in what I report to you. There are two streams there. Let me explain.

If you visit the top of Kaaterskill Falls please notice the rock ledge that rises above the modern flow of water. Notice the stratification within those rocks. Beds of sandstone lay there, all of them inclined in the direction of the falls. These sandstone beds and their patterns of stratification make what is called planar cross bedding. That is a sedimentary feature which we associate with the channels of rivers. Essentially, these strata were part of a sand dune which formed within the channel of the old stream and grew with time as it also migrated down the stream.

Aha! Now you too can see my second stream; it is composed of rock. Planar cross stratification occurs when powerful river currents are sweeping sand along in a downstream direction. As long as the current stays strong the sand will continue on its journey. But, just as the current is starting to slow down which has to occur eventually, then deposition begins. The sand slows down too and that dune begins to form and then it grows one stratum at a time. That growth continues the dunes migration as it is now growing in a downstream direction. Look carefully and that is what you can see here. Those strata of rock are inclined to the right which is roughly to the southwest. That’s the direction that the old stream was flowing. And, it is also roughly the direction that the modern stream is flowing.

What happened to that sand and its dune is that it finally stopped advancing downstream and never moved again. The stream was probably diverted to a new path, rivers do that. Then, with time, the sands came to be buried under so much more sediment that they were hardened into rocks. This became a petrified dune in a petrified streambed.

And so it is that I really do see two streams here. One is modern, the other is very ancient. Both display the same direction of flow, to the southwest. It is so odd to see two streams, so similar to each other but separately by hundreds of millions of years. But it is the nature of my science of geology to discover such things.

   Kaaterskill Falls is a wondrous place, but it can be a dangerous place too; a number of people have fallen to their deaths at Kaaterskill Falls, you must be careful there. Wait for dry and warm times before you visit. Contact the author at titusr@hartwick.edu  or visit the facebook page “The Catskill Geologist.”

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