"I will never kick a rock"

Category archive

Uncategorized - page 6

Dinosaurs in Woodstock??? Aug. 22, 2018

in Uncategorized by

Jurasstock Park

On the Rocks

Robert Titus

Woodstock Times

July 3, 1997

I went and saw Jurassic Park recently. I happen to be a paleontologist, so I thought that it was about time I saw the kind of life that I should be leading. The movie was a lot of fun and there was plenty of action and adventure. There were good-guy paleontologists and bad-guy paleontologists which is an angle I had never reflected upon before. I have enjoyed my own career in fossils very much so far, but it is clear, from this vicarious experience, that I have missed out on a lot of excitement. Chasing fossil brachiopods is just not the same as being chased by a Tyrannosaurus.
If you see the movie you may wonder what it was like here in Woodstock back during the Jurassic. The answer is that we don’t know. There are no Jurassic age rocks in this area. No rocks/ no history is the way it works in Geology. Nevertheless, it is fair to speculate as to what it was like around here way back then. And, in fact, there are some Jurassic age rocks not all that far away. They can tell us a lot.


It was the Jurassic and the earlier Triassic times that witnessed the origins and early history of the dinosaurs. In New York State there are late Triassic and early Jurassic sedimentary rocks in Orange and Rockland counties; there are more in central Connecticut. Only a few fossil dinosaur skeletons have been found in these sequences, but the strata are just crawling with dino footprints. And there is an especially interesting species of dinosaur whose footprints are quite common in these rocks, a dinosaur that certainly once lived here in Woodstock. Its Latin name is Coelophysis, and it was a very fine specimen. It belonged to a group called the ostrich-like dinosaurs. Coelophysis wasn’t especially large, being only five feet tall and nine feet in length. It was, however, remarkably athletic. They were agile and light-weight, weighing in at a little more than 100 pounds. It’s probable that they were among the earliest predatory dinosaurs. Coelophysis had small forelimbs, but they were armed with long recurved claws. Its large mouth possessed numerous, knife-like teeth. All in all, the animal would have been quite effective at ripping its prey apart, making it an excellent movie monster.
But that’s wasn’t the scariest thing about this dinosaur. There are sites in New Mexico where their skeletons are so abundant that paleontologists have speculated that they must have hunted in packs. That really gets us to the Jurassic Park stereotype of dinosaurs as vicious marauders. And there may be a great deal of truth to the stereotype. I once saw a series of dinosaur trackways. They were all the same species, all the same size, they were spread out evenly, and all heading in the same direction – a skirmish line of predatory dinosaurs! I had 15 of my students place their feet in the tracks and, on signal, they all stepped forward, laughing, growling and retracing those 190 million year old trails. Dinosaurs can be fun, at least the dead ones that can’t eat you are fun.
Coelophysis likely did live here in Woodstock and dinosaurs are part of our local geological heritage. It’s too bad we can’t go out and hunt their bones. I don’t know if there ever were any Jurassic age strata in Woodstock, but if so, they would have eroded away millions of years ago. All evidence of local dinos has been gone all that time. Want to see some real dinosaur fossils? Travel to Dinosaur State Park, near Rocky Hill in central Connecticut. There is an outdoor display of footprints there. Maybe one of the dinos that left its footprint in Connecticut came from Woodstock.

Fossil rain drops? Aug. 16, 2018

in Uncategorized by

Raindrops
On the Rocks
The Woodstock Times
Mar. 20, 1997
Updated by Robert and Johanna Titus

We encounter many natural wonders in this field of geology and too often we take them for granted. There are so many things preserved in the rocks that really should not exist. Dinosaur footprints are good examples. How could something as ephemeral as a footprint in the mud be preserved 100 or 200 million years after they formed? The answer is that they really shouldn’t; it’s a one in a million chance. But what if there were ten million dinosaur footprints? Then ten of them would be preserved. If there had been a hundred million dinosaur footprints, then a hundred of them should still be around. One in a million shots become certainties if you just play the odds.
And geologists must learn to play the odds. Pretty much all of the fossils we find were originally one in a million shots. They were bones or shells or tree trunks that defied the odds, got buried, hardened into rocks and were found. And then, when you have a million fossils, one of them is truly a grand discovery: a complete dinosaur skeleton, a mastodon frozen in the tundra, a little frog in a piece of amber and so on. Search for fossils long enough and you beat the odds.
We are used to this, but there are still things that we have a hard time believing, even if we see them ourselves. One of those odds-defying oddities can be found right here in the Catskills. They actually aren’t fossils, but the word fossil can be used to describe them. They are raindrop prints, often called “fossil” raindrop prints.

 

                                                                        “Raindrop prints” scattered across surface

What could possibly be more ephemeral than a raindrop print? The drop falls out of the sky and leaves an impact crater in the soft earth. The crater is just that, a soft rim of earth thrown up by the impact. So far, so good, but how can something like this come to be preserved? Isn’t it likely that the very next drop will destroy the crater left by the last one? The answer is yes, of course, and the next 100 or 1,000 drops will also destroy any craters left about. And after the storm, won’t the earth be too soft to preserve an impact crater? Of course it will, the ground should be all mud, too soupy to preserve any such features. And even if a raindrop print were to survive, wouldn’t wind eventually blow it away, wouldn’t animals step upon it, wouldn’t plants grow through it? Wouldn’t this and wouldn’t that! The answer is yes, yes, yes, the raindrop should be destroyed.
And yet, there they are, . . . preserved in rock . . . little, bitty structures that look exactly like . . . raindrop prints! So, how did they get there? The prints are found on the surfaces of beds of red shales which are thought to have once been soil surfaces. That’s a helpful hypothesis and it adds some plausibility to the story. But, shouldn’t the prints be lost in a mush of mud? To avoid that you have to imagine a very brief shower. A few drops sprinkle the landscape and then the “storm” is over, hardly before it had begun. But what about preservation? Next you have to let the soils dry out. This doesn’t turn it into rock, but dry soil is stiff enough to resist distortion. Finally, you want a flood to occur and submerge the flood plain. Floods are often not as catastrophic as the evening news coverage would suggest. Flood waters can often rise rather passively and bring blankets of new mud to bury the old soils. That can be done without much disruption of the rain drop prints. Continue this process for a very long time, bury the prints in a deepening thickness of sediment, and it will harden into rock. With that the raindrop prints are preserved. It’s a long shot, a very unlikely sequence of events, but it is possible, and it does happen. And that’s how it is that we can go and find such remarkably unlikely features in the rocks.
Such things are called primary structures. They are rather fun to watch for and they tell us so much about what the rocks represent. We would like to tell you where to go and find some raindrop prints, but that is hard to do. Look for red shales and these are common throughout the Catskills. Then pick through the shards of shale. If you are lucky you may find some. If you are not lucky, well maybe next time.
=================================================================
Contact the authors at randjtitus@prodigy,net. Join their facebook page “The Catskill Geologist.”

A lot to Overlook – Aug. 9, 2018

in Uncategorized by

Halfway measures
On the Rocks
Feb 13, 1997
Updated by Robert and Johanna Titus

We usually think of mountains as emblems of permanence. “Old as the hills” is certainly a common enough old chestnut. It implies that the hills (and mountains) are just going to be there forever and ever.

That may not be. George Halcott Chadwick found it otherwise. Chadwick was one of the great Catskill-area geologists of the first half of the 20th Century. He spent a lot of time looking at regional maps and he gradually came to the conclusion that the eastern Catskills are, quite literally, not all there. Take a look at a good regional map. Kaaterskill and Plattekill Cloves divide the Catskill Front into three east-west ranges: the Jewett Range in the north, the Roundtop-High Peak range in the center, and the Sugarloaf to Plattekill Mountain range in the south. Each of these three ranges is sharply terminated on the east by the steep, straight slopes. It’s as if something had chopped off those eastern parts. The three eastern slopes are called “truncated spurs” and together, they define the “Wall of Manitou” of the Catskill escarpment. The “Wall” is a straight, ten-mile long front. Chadwick found that to be remarkable; he thought that the truncated spurs and the steep, straight nature of the wall required some unusual erosional processes to explain them. He believed that it was glaciers which did the job.


The story begins a bit more than 100,000 years ago when there was an event called the Illinoian glaciation. A massive glacier, advancing from the north, seems to have descended the Hudson Valley and gradually filled it. Picture a stream of ice, at least to the brim of the valley and probably a lot higher. In many ways it behaved like a river, the ice slowly flowed down the valley. Now some sort of a Catskill Front had already existed, but it probably wasn’t the steep straight wall that we know today. More likely, gentle slopes descended gradually, well east of today’s wall. In fact, Chadwick thought the slopes may have reached out one or two miles into the Hudson Valley. That included Overlook Mountain which would have been, Chadwick thought, about twice its present size.
The passage of the ice had an erosive effect upon the old slope. Moving glaciers pluck and grind away at landscape’s bedrock. The ice likes to carve a steep-walled trough and that’s what the Illinoian glacier set about doing. The lower slopes of the Catskill Front were largely composed of soft shales and these eroded easily. The upper slopes were of resistant sandstones and these put up much more of a fight. Given time, the steep slopes of the Wall of Manitou were the result. But not before quite a bit of Overlook (and the rest of the Catskill Front) was worn away.
With the return of warmer climates, the Illinoian glaciers eventually melted but the respite was brief. About 25,000 years ago the climate deteriorated again and once more a stream of ice flowed down the Hudson Valley. This has been called the Wisconsin glaciation. The whole process was repeated and again the Wall of Manitou suffered even more erosion.


This had a real effect upon Overlook. We described the final stages in the process in a Times article last August (1996). The steep ledges up there date back to those last moments of glaciation. In the end, after the Wisconsin glaciers retreated, Overlook Mountain was literally half the mountain it used to be. Fully two miles of eastern Overlook were gone. It’s quite a thought, half a mountain lost. That is, if Chadwick was right.
George Chadwick’s story is a fine one and we are very fond of it. We hope that it is true, but the hypotheses of science are not always so simple. Sadly, there are modern geologists who very much doubt that this is what happened. They just do not think that passing ice is capable of removing so much rock. One of the problems with their objections, however, is that they don’t have any better ideas. So–is Overlook a whole mountain or is it half a mountain? That is the question.
==================================================================== Contact the authors at randjtitus@prodigy.net. Join their facebook page “The Catskill Geologist.”

The Worm turns Aug. 3, 2018

in Uncategorized by

The Worm Turns
On the Rocks – The Woodstock Times
June 26, 1997
Updated by Robert and Johanna Titus

On Rt. 9W, at Glenerie, the Esopus River descends two ledges of rock known as the Glenerie Limestone. These ledges make up what are either high rapids or low waterfalls, depending on your point of view. In any case they also make a very nice setting and the shores of the Esopus there attract a lot of people. We sat on the banks for a while and watched people go by. There were two fishermen, who had no luck. A couple walked by with their dogs. Several young boys came by on their bicycles. One elderly man wandered along the shore, we think just for the pleasure of it.
Such is life for human beings who are not at work, but just intent upon enjoying a little leisure. The Glenerie Falls provides a setting to idle away a few minutes or a few hours. As I sat along the Esopus, we was watching just a few random moments in the history of life. Nothing special occurred, nothing historic or even meriting the slightest of note. Most of what goes on in this world is like that. Little that happens is really of very much significance. Such is life.
It’s easy to forget that this spot has always been here. The world is four and one half billion years old and this precise longitude and latitude has been here all that time. What was it like here a century ago? We don’t know, but with the help of a historian we could easily guess. How about 500 years ago? A little harder, but good guesses might come from an Indian archeologist. How about a million? or a hundred million? or a billion years ago? Even a geologist has a hard time answering those questions.
So much of earth history slips off into the past without leaving any monument or even a clue as to what had transpired. But none of these moments is likely to have amounted to much, just simple events during average times. Countless living creatures have passed by the Glenerie Falls site and almost all are gone and have been entirely forgotten by history. Disappearing into the oblivion of the past is a sad fate that we all share eventually. . . almost all.
But sometimes, hundreds of millions of years after their deaths, signs of the lives of ancient creatures return to light. And we mean that very literally. Memories of ancient organisms are often revived when weathering and erosion of bedrock brings to surface the evidence of lives long lost. We geologists call these “trace fossils.” They are not the bones or shells of ancient organisms, but the evidences of ancient activity, the very behaviors of the past. The best known trace fossils are dinosaur footprints. People have marveled at them for more than a century. They forget that these “marvels” are only evidence of the most every day and literally pedestrian moments in the lives of dinosaurs. Unfortunately we don’t have dinosaurs or their footprints anywhere near Woodstock. But we do have other trace fossils.
A lower ledge of the Glenerie Limestone forms the lower cataract of the falls. The rock is tough and brittle stuff and it has held up well against the elements. On the bank, just below Rt. 9W, this ledge has been brought to the surface by folding of the bedrock. The upper surface of the inclined stratum is a fossil wonder. It’s densely littered with the trace fossils of worms that lived here about 400 million years ago.

The animal has a name – it’s Zoophycos. It was a common marine worm, much like many that live today. You probably know that earthworms make their living by burrowing through soil, consuming and digesting it as they slowly move forward. Similarly, Zoophycos burrowed and ate its way through the marine sediments, including the limestone sediments of the Glenerie. Zoophycos was extremely meticulous in the way it dined on sediment. It burrowed forward for a while, its path taking it in a broad, round loop. The worm then turned abruptly and returned, closely paralleling its first path. Then, once again, it turned on a dime and paralleled its second path. Back and forth it continued, carefully consuming all of the sediment. Eventually the back and forth path took on the form of a rooster tail and that is the common name it goes by. “Rooster tails” are common throughout the marine sandstones and shales of the Catskills, but this is the first time we have seen them in a limestone. They are fascinating fossils and marvelous insights into the details of ancient life, but they record such mundane moments: Worms eating mud!
If you carefully examine this ledge of rock you will be surprised at how densely burrowed it is. A large population of these worms must have lived here. To survive on a limited food resource, they had to evolve the careful feeding patterns that we see. We doubt they missed anything. There is, we suspect, a message here.++

Rocks with sole July 26, 2018

in Uncategorized by

Rocks with Sole
The Woodstock Times
A long time ago
Updated by Robert and Johanna Titus

The Austin Glen Formation is not all that impressive a rock to look at. It’s made up of alternating strata of gray sandstone and black shale. But in many ways, it is one of the most awe-inspiring rock units in the area. It makes up much of the bedrock on the east side of the Hudson River. Travel across the Kingston-Rhinebeck Bridge and it makes up the first outcroppings of rock you will see. These are the low cliffs on either side of Rt. 199. We made the trip recently and took a good look at these outcrops. About 30 paces east of the beginning of the west-bound lane’s exposure we found a remarkable sedimentary structure: One overhanging stratum of rock displayed a crenulated surface. We recognized the form as a type of “sole mark” and it conjured up quite an image from the past.
The sands and muds of the Austin Glen were deposited in some of the deepest waters that make up ocean basins. There is a wonderful word, “abyss,” used to describe great depths in the sea. The abyssal plain is a great vast flat sea floor, about two miles down. But we are talking about something even deeper. We are speaking of a sea floor zone called the hadal zone, that’s a great deep trench at the bottom of the sea and it can be several tens of thousands of feet deep. Today’s Marianas Trench is the best such example we can go see. It is 36,000 feet deep, an incredible depth. We don’t think that the Austin Glen was quite that deep, but who knows for sure.
Not only is a marine trench of this sort deep, but it is also very steep-sloped and that gets us to today’s story. You see, the shales of the Austin Glen formed originally as black muds. It’s typical for such great depths to accumulate muds; the fine clay particles settle to the deep-sea floor and make up the muds. But the sands are different; sands are usually shallow water deposits. Obviously, the sandstones of the Austin Glen weren’t shallow water deposits so how did they get there?
The answer it that the sands were once part of something called turbidity currents. These are very fast-moving currents of dirty (turbid) water that rushed downslope at speeds of up to 50 mph. More likely than not, an ancient earthquake struck and displaced a large amount of shallow water, sandy sediment. Billowing masses were thrown up into suspension by the quake and then they began to flow downhill under the influence of gravity, soon accelerating to their rapid pace. A turbidity current is one of those very powerful forces of nature. Fortunately, there are few animals that stand in the way and few deaths result. There is some destruction, but only in the form of rapid erosion of sediments crossed by the current.


At the bottom of the slope the turbidity currents slow down but, still moving rapidly, they spread out across the soft muds and deposits their sandy sediments. The sudden deposition of sandy sediment upon soft muds has an interesting effect. As the sand spreads out across the sea floor, it presses into the soft muds. The results are the crenulated surfaces we described earlier. They are called sole marks. There are a number of different types of sole marks and, technically, these ones are called “squamiform load casts.” Let’s not get too concerned with the exact terminology and instead try to appreciate the aesthetics of these structures.

They are rather remarkable in the details of their sculpturing and we have trouble finding just the right adjectives for them. Take a look at our illustration and you will get a good impression of them. These soles are common throughout the Austin Glen Formation and, once you have an eye for them, you may be able to find others. We origins: underwater avalanches, triggered by great earthquakes; it’s quite a scenario and very typical of what we find when we know what to look for in the rocks.
================================================================
Contact the authors at randjtitus@prodigy.net. Join their facebook page “The Catskill Geologist.”

A new trail at Kaaterskill Falls July 19, 2018

in Uncategorized by

Tub thumping at Kaaterskill Falls
On the Rocks
The Woodstock Times
April 14, 2015
Robert and Johanna Titus

Have you been to the new trails at Kaaterskill Falls? We lobbied for this sort of thing for many years. The DEC seems to have been influenced, in part, by this column in the Woodstock Times.

The year 2014 was a difficult one at Kaaterskill Falls. That summer two people fell to their deaths. It’s a dangerous place; you only have to be careless for a second or two and then the worst can happen. Naturally, everyone involved is quite concerned about the upcoming summer season. We wish these things did not happen, but they do. And there is so little that you can do to mitigate this sort of thing. They have put some new fences up, but they are unlikely to deter people from going into dangerous areas. Some better communications are now available for first responders, and we understand that the site is better prepared to get helicopters in and out of it.
Still, it just takes a second or two for the worst to happen,
But we are concerned about other problems at Kaaterskill Falls, and those are problems that may actually have solutions. Our first concern is the ongoing erosion of the slopes just to the right (east) of the falls. It has been about two centuries now, that people have been coming here in ever increasing numbers. It used to be that the marked Yellow Trail ascended the slope to the right of the falls and people climbed up to the top of the falls that way.

But the ground is soft there and, especially when it is wet, the results of climbing are to mobilize the earth. There is no hope for vegetation to take hold here; plants are quickly trodden into the ground. When it rains, the bare earth is likely to slide downhill, just a bit: just a bit today, and just a bit tomorrow, and just a bit next week. You get the picture. The slopes have been eroding for all those two centuries.
Years ago, the Yellow Trail, above the base of the falls, came to be closed. That probably has helped a little bit, but just a little bit. People still climb up those slopes: we confess; we are among them. It’s not likely that this will stop. Late, last summer, those new fences were put in, but it is hardly likely that these will even slow people down. We posted a photo of one new fence on our Facebook page and the responses were uniformly sarcastic.
So, if this is not working, then what should be done? Our solution, and we have been arguing this for 20 years, is that a staircase should be built. That’s certainly not an unprecedented idea. When William Henry Bartlett sketched at Kaaterskill Falls during the 1830’s, his picture showed a staircase from the bottom to the top of the falls.


Detail from Bartlett print of Kaaterskill Falls. See staircase to right.

But during the last century, this property came to be owned by New York State, and thus part of the Catskill Park. If we understand it properly, park land should not have artificial constructions on it. This land is supposed to be pristine and natural. A staircase would be unnatural, a violation of what is intended. The irony is, of course, that, without a staircase, people do far more harm.
So those “pristine” slopes have been slowly and steadily deteriorating for centuries now: with more centuries to come? We hope not. If we are looking for precedents, we do not just have to visit the 1830’s; we can look at a good example today. Have you ever been to Mine Kill Falls? Take Rte. 30 north from Grand Gorge and watch for signs that announce the presence of the falls. There is an ample parking lot and, just below that, you can begin descending a nice dirt trail into the Mine Kill Gorge. The trail will take you all the way to the bottom of the falls. Your boots will do little damage here; the slope is so gentle that you will not trigger any significant erosion.


But, there is another trail. Its left fork takes you to a staircase and that staircase takes you to a fine view of the upper Mine Kill Falls. Then there is a right branch; its staircase takes you to a view of the lower falls and the canyon below it. It is a most remarkably picturesque location. And we don’t think you will find that the scenery is harmed in any way by the staircases. You will not likely find this to be some sort of environmental abomination.
The steps get people to the upper falls safely and easily. And there is absolutely no erosion going on below the stairs, nor will there ever be any. It is a nice, environmentally sound, solution to a serious problem. Visit Mine Kill and see for yourself. Then imagine some equivalent installations at Kaaterskill Falls.
But there is more, there is another problem that we wish to help solve. The two of us belong to the Mountain Cloves Scenic Byways Committee. We are hoping to promote greater eco-tourism in our picturesque eastern Catskills. We need a trail system that smoothly transports hikers from below Kaaterskill Falls, past the falls, and on to the Blue Trail that leads to the north rim of Kaaterskill Clove. In short, we want a well-planned trail system that promotes green tourism.
We don’t have that now. Today, you can take the Yellow Trail to the base of Kaaterskill Falls and then you are supposed to turn around and go back. Who on earth would want to do that? Our proposed staircase, we hope, would lead on, above the falls, to join the greater trail system. It would be a great lure for tourism in our area. We need it.
This is Greene County; our tourist industry has long been deeply depressed. Greene County is a landscape of lost hotels, empty motels, and long forgotten boarding houses. This, the onetime home of the Catskill Mountain House Hotel, now has very few overnight rooms and still fewer people looking for them. We need help and, just maybe, a more thoughtful trail system would be a step in the right direction. That all hinges on a staircase being installed at Kaaterskill Falls.
We don’t do a lot of tub thumping at On the Rocks, but we think this is worth the effort.
==================================================================
Contact the authors at randjtitus@prodigy.net. Join their Facebook page “The Catskill Geologist”

Lost continent of Atlantis 6-12-18

in Uncategorized by

Living on Atlantis
Stories in Stone
The Columbia County Independent
December 2005
Updated by Robert and Johanna Titus – July 12, 2018

It was 2,300 years ago that Plato wrote of a great island, “larger than Libya and Asia taken together.” His island was the fabled Atlantis and it lay out in middle of the Atlantic Ocean, beyond the Straits of Gibraltar. The story went on: fully 9,000 years before Plato’s time, Atlantis was a great city state which controlled an empire extending as far east as Egypt and Italy. After fighting and losing a war with the Athenians, Atlantis was consumed by a day and a half of earthquakes and floods. The whole land mass sank into the ocean and it has been lost ever since.
It’s a wonderful story and just the type that that we scientists love to debunk. But the word debunk implies ridicule, and when you ridicule a popular myth, you run the risk of appearing arrogant. Now, believe us, arrogance is not exactly unheard of in science, so let’s take a careful look at the story of Atlantis. We will find, as is so often the case, the true story is a lot better than the myth.
You can start by traveling to west of the Hudson River and gazing back eastward from any prominent high point, preferably the top of the Catskill Front. A lot of geologists have done this. They are looking at Columbia County and the profile of the Taconics, but nearly all have pondered the same question: Where did all this rock come from? Beneath them, the Catskill Front is made of 17,000 feet of sandstone shale and limestone. That’s only a small part of what is sometimes called the “Appalachian sequence.” The whole sequence consists of sedimentary rocks about 40,000 thousand feet or so thick. It wasn’t always rock, it was once all sediment. Sediment has to come from somewhere and 40,000 feet of it has to come from somewhere—and somewhere big, so you can appreciate the geological curiosity.
In the 1840’s James Hall, the great Albany geologist, got very interested in finding where all those sediments had come from. He traced them all across North America and soon convinced himself that the thick Appalachian deposits always thinned to the west. It must be, he thought, that if the sediments thinned to the west, then they must have come from a source in the east. Now James Hall had no interests in the myth of Atlantis, but other geologists wondered about that sourceland. Was this the real Atlantis?
In the late 19th century, Charles Callaway calculated the total volume of sediment that made up the Appalachian sequence. From this he judged that there must have once been a sourceland out in the North Atlantic. He estimated it to be about the size of Australia. Callaway thought that the weathering and erosion of this sourceland provided the sediments of the Appalachian sequence and also similar rocks in Europe. Callaway thought that he had come up with the scientific discovery of an ancient lost continent–a real one! He called it “Old Atlantis.” Old indeed, Callaway’s continent was about 400 million years older than Plato’s one.

 


                                               Callaway’s cross section of “old Atlantis” and its sedimentary rocks.

Callaway’s idea remained popular into the 20th century, but as science progressed, it didn’t hold up all that well. Oceanographers were learning more and more about the floor of the North Atlantic. Surely, they reckoned, if there had once been and Atlantis out there, then some remnant would still remain, but none was ever found.
The solution to the source land problem came in the late 1960’s and it was a terrific story, much greater than the old myth. Continents and oceans, it turned out, were not eternal. Once there had been no Atlantic Ocean at all, neither was there a North America or Europe. Instead there were great land masses, ancestral to the ones that we are familiar with today. Back then, an ancestral Europe was drifting westward and actively colliding with an earlier form of North America. As the two crushed together a great mountain range was thrust up all along the collision zone. Such things do happen and can even be seen today. India is colliding with Asia and the Himalayas are the product of that collision. Our Taconics and Berkshires are part of the 400 million year old ancestral Appalachian system. At their peak they were called the Acadian Mountains and they, not Atlantis, provided the sediments we see today in places like the Catskills.
So the Atlantis of Plato’s myth never did exist. But when we debunk his story, it’s not arrogance, but confidence that science can provide a better story which motivates us. Our story tells of moving and colliding continents. The story speaks of once towering mountain ranges which are no more. It’s a great yarn and one of the most important scientific discoveries of the last century. And to us, the best is that the story comes from the stones.
So find the time someday to take a hike up to the top of the Catskill Front and gaze east. Find the Taconics and Berkshires on the distant horizon. That’s Columbia County below them; it’s all “Atlantis!” Adds something to the view, doesn’t it?

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

The Abyss 7-5-18

in Uncategorized by

The Abyss

A shortened version of a Kaatskill Life article from 2002

Revised by Robert and Johanna Titus

 

One of the great tourist attractions of our area is Olana, the one-time home of painter Frederic Church. We stood on the bank in front of the south-facing porch of the old mansion and gazed at its fine view of the Hudson Valley and Catskill Mountain. This is one of the great vantage points from which to see the Catskills. There are days when the atmospheric conditions are just right and the mountains seem to reach out to you. It’s not just a view; this is also a genuine work of art. Frederic Church intended the porch should have this vista; it is, among many others, one of his “planned views.” For thirty year he was able to enjoy the scene and we envy him that.

But as geologists, we are privileged to see some other views at Olana. On that wonderful site our minds drifted back into deep time. We were at the bottom of the oceanic abyss that was once here. The waters were tens of thousands of feet deep, cold and black but, more than anything else, they were still and silent. This was a dead seafloor. Nothing crawled across the sea floor and nothing swam in the waters. We scooped up some of the mud; it was soft and sticky. It was foul with the remains of dead microbes that constantly rained in from above.

With time the submarine avalanches came. Geologists call them turbidity currents. The stillness was abruptly interrupted as the sea floor was jolted by seismic shocks. An earthquake had struck. Shortly thereafter great masses of sediment began tumbling down the steep slopes. For long minutes there was the rush of dirty water into the abyss. The torrent boiled as murky clouds billowed upwards all around us. Then the current slowed and gradually the water cleared. The Olana sea floor returned to its silent dead, stillness.

Our mind’s eyes rose through tens of thousand of feet of quiet water until they reached the surface of the sea. We gazed eastward and saw dense black clouds rising above the horizon. The blackness drifted our way and soon it rained volcanic dust into the water all around. Then we looked back eastward again, and now a rising landmass had replaced the black clouds on the horizon. The stark profile of volcanic mountains defined this new horizon

The passage of time accelerated. As we watched, this landmass grew taller and its shores swelled out toward us. We were soon lifted out of the sea by the rising gray crust. Occasional, the earth beneath us shook with powerful quakes as the land rose higher and higher. Eventually, we found our imaginary selves high atop a still rising Taconic Mountain range. To the north and south, volcanoes continued erupting in violent spasms. Below, to the west, what was left of that deep sea retreated away from the rising mountains.

There should have been a great deal of green in this image but there was none. This was a fine range of mountains, but it was a dead landscape that had replaced a dead seafloor. We were in the Late Ordovician time period, about 450 million years ago, and life, especially plants, had not yet managed to colonize the lands. All around us was a bleak, blue-gray landscape. There were not even proper soils, just a litter of gray gravel lying upon bare rocks. Only the dry channels of gullies and ravines broke the monotony of the desolation.

We realized that we had come to the very spot where, 450 million year later Frederic Church would stand. But we were not seeing what he would see. No, below us and stretching off to the west, a large river delta had formed adjacent to the rising Taconic Mountains. A complex of murky streams crossed the dark gray of that delta. Farther away we could see the retreating waters of the sea. It was bleak and lifeless vista, but there was grandeur in this, Olana’s great unplanned. view.

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

 

Cairo Round Top Mountain June 6/28/18

in Uncategorized by

The Round Pyramid of Cairo

On the Rocks

Updated by Robert and Johanna Titus

April 19, 2012

 

Once you begin to notice it, Cairo Round Top is a mountain you can see from all sorts of places within the Hudson Valley. It can be seen from the north and south and from above and below. It’s aptly named and rather picturesque for its smooth rounded profile, but the question that emerges is how did it get there.

Round Top rises above Cairo

Any geologist, working in this region, would immediately guess that glaciers had something to do with it. And that’s exactly the case with Round Top. The proof comes with a careful look at its upper slopes. Most of Round Top is posted land, but there are several roads that circumnavigate the hill. On Heart’s Content Road, southwest of the hill, you can get a good look at Round Top. Up toward the top there is a great ledge of rock. It’s typical Catskill sandstone. Long ago, nearly 400 million years long ago, that sandstone made up the channel of an ancient river. The quartz sands of that river have hardened into rock. Quartz sandstone is among nature’s hardest and most durable rocks. Hence the cliff, but there’s more than that.

About 22 thousand years ago a very sizable glacier was advancing down the Hudson Valley. It filled the valley right up to the top of the Catskill Front. Indeed, it overflowed into the Catskills themselves. That, however, is another story. The important point here is that much of the time the ice overrode Round Top, the hill is only a little more than 1,400 feet tall and was not much of an obstacle to the flow of the ice. The glacier simply flowed across it.

Glaciers have a very predictable effect upon mountains that dare to get in their way. They tend to streamline the upstream side of the hill. That accounts for the smoothly rounded form of most of Round Top. The other thing that a glacier does is a little more difficult to explain. The downstream side of the impeding hill comes to be sculpted into a steep downstream-facing slope, often a cliff. The process is called “plucking.” The ice apparently adheres to the rock and yanks loose large chunks of it and drags it off. Over time a cliff results, a scar of the plucking process. That is the explanation for that sizable ledge at the top of the south side of Round Top.

Okay, so far, so good, it sounds like we have explained Round Top, but we haven’t. We understand the shape of Round Top but what is it doing there? Our curiosity is about why the mountain exists there at all. You see, the Hudson Valley glacier advanced down the valley at least from 25,000 to 14,000 years ago and that is a lot of time. It also passed down the Hudson Valley about 120,000 years ago during an event often called the Illinoisan glaciation. The passing ice plucked the Catskill Front as well as round Top and over time it sculpted the Wall of Manitou as the Catskill escarpment is sometimes called.

And that is our problem. How come Round Top didn’t get scoured away entirely during all of this glaciation? We don’t know and that bothers us.

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

An ice-scoured plain 6-21-18

in Uncategorized by

An ice scoured plain

Robert and Johanna Titus

June 21, 2018

 

We have been members of the Mountaintop Arboretum at Onteora Park in Tannersville pretty much since it was formed about 20 years ago. We have lost track of how many times we have made presentations there. But we are speaking at the Arboretum once again this Saturday, June 23, 2018 at 10:00 AM. We will be giving a PowerPoint presentation about the ice age and bedrock history of the Arboretum grounds. Then we will be taking our audience outside to do a geology walk across a good part of Arboretum property. It will be an easy walk across a relatively flat landscape. Try to come along, if you can fit it in to your schedule.

You may not be able to attend so we thought we would put together a bit of a quick guide for some time when you will be able to get out there. The main part of the Arboretum grounds are called the West Meadow and that is in the northwest corner of the property. Scattered across the West Meadow are the trees that make up the bulk of the Arboretum. You can visit and wander the trails that are there. You can look at the various species of trees which are all well labeled. There is even some art in the form of stone sculptures.

 

 

Map of West Meadow.

But, of course, when we are there, we see the geology, a lot of geology. We will be speaking about it all on Saturday, but let’s focus on the West Meadow today. To get there you travel north on Rte. 23C north from Tannersville until you reach the Arboretum. You can park on Maude Adams Lane and then walk back to the gate to the West Meadow. When we are there, we look across the grounds. What we see is a landscape that shows the effects of glaciation. We see what might be called an ice-scoured plain. That is, we see a glacier sweeping down from the North and overrunning the grounds of the Arboretum.

The most obvious manifestation of that is the exposed bedrock, right there at the gate. The bedrock, here, has been scoured by the passing ice. It has a smoothed and polished look to it. Wander around and look it over. You will, we think, be able to see the polish. Also, look for long straight scratches in the surface. They have a north to south compass orientation. These are glacial striations. If you have been a regular reader then you have seen these before. They were made as the glacier dragged cobbles and boulders across the surface. These are faint impressions and we couldn’t get a good photo, but you should be able to find them without much trouble.

Chattermarks

Next, watch for crescent shaped fractures in the rock surface. These are called chattermarks, they were formed when a boulder was dragged across this same surface. The weight of the ice pressed down, but the push of the glacier pushed it forward. When the push overcame the weight, the boulder “leaped” forward and “landed” leaving the crescent. Over time a series of crescents was formed.

 

Next, look around and you will soon see a large boulder. That’s something called a glacial erratic. That’s a boulder that was swept up and carried along by the advancing glacier. The boulder reached Arboretum grounds when the climate warmed and the glacier melted away. The boulder has been sitting here ever since the end of the Ice Age.

Glacial erratic

Now you know enough to be able to wander the grounds of the West Meadow. We are sure you will enjoy seeing all the trees that are there. After all, that is why the Arboretum was established. But now you will be able to understand and appreciate that this is an ice scoured plain. Watch for other ice scoured outcroppings; there is a very good on in the southeast corner of the meadow. You will see other glacial erratics as sell; they are scattered about all across Arboretum property. We hope you will just plain understand this landscape better.

Contact the authors at randjtitus@prodigy.net.

 

 

 

1 4 5 6 7 8 17
Go to Top