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The past two weeks I've been able to go out collecting a couple of times- two different locations, both Lower Devonian. Where I live the bedrock is all metamorphic. Nice scenery, wooded hills, lakes and wetlands, but metamorphic rock, so I have to drive over an hour to get to the nearest sedimentary exposures that are fossil bearing. My favorite locality that's within an hour and a half is Glenerie, which is located between Kingston and Saugerties just west of the Hudson River. It represents the type locality for the Glenerie Limestone. New York's Lower Devonian is divided into two groups: the Helderberg and the Tristates. The Tristates is the younger of the two and that's where the Glenerie Limestone is placed. I first visited the Glenerie site when I was a teenager. When I resumed fossil collecting 12 years ago, it was one of the first sites I revisited and quickly became a favorite (I lived much closer to it then.) For a while, I was there almost every week and this site was the first one I built up a collection from. As I became acquainted with other fossil sites, I visited Glenerie less often, but in recent years, inspired in part by my fossil hunting comrades, I've been going more. The Glenerie site is very rich in brachiopods which probably make up over 95% of the marine fauna. The vast majority of those are single valve. which display amazing detail in ornamentation, muscle scars, etc. Gastropods, tentaculites, bryozoans, and trilobites make up most of the rest of the fauna. Corals have been found by some of my friends on very rare occasions. I have found a single small nautiloid there as well as a partial crinoid calyx. I saw another this time, but unfortunately, was unable to extract it. The fossils are usually preserved in silica which resists the weathering that dssolves the limestone. Some of the limestone is densely packed with fossil shells. However, the rock is so hard that extracting the fossils which are actually softer than the matrix, is impossible. There are areas of the outcrop, near the top and in crevices where shells weather out complete and can often be obtained intact surface collecting. It was a good day for finding gastropods. I was able to collect a half dozen, including this one, a Platystoma ventricosa- actually two shells side by side, two and a quarter inch across.
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Two For One- Platystoma Gastropods from Glenerie
Jeffrey P posted a gallery image in Member Collections
From the album: Lower Devonian
Platystoma ventricosa Two Platycerid Gastropods (attached- 2 1/4 inches across) Lower Devonian Glenerie Limestone Tristates Group Glenerie, N.Y.- 2 comments
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The Devonian period is known as "The Age of Fish", but could also be known as "The Age of Brachiopods." In the Early / Lower Devonian, brachiopods reached the height of their diversity towards its end in the Emsian. We see the ancestral groups occurring, lingulids, craniids, orthids, protorthids, pentamerids, rhynchonellids and strophomenids, as well as the later successful groups we have seen before such as atrypids, athyrids and orthotetids, plus the rise of spiriferids, spiriferinids and productids and the beginning of the terebratulids. By the end of the Devonian , several of these groups are extinct or severely reduced in importance and brachiopods never quite recover. Also, the Devonian is the last time we see trilobites with such variation, large sizes and numbers and orthocerids too are much more uncommon after the rise of the goniatites. The massive tabulate coral reefs also disappear after the Devonian. Fascinating period and I hope to share some of its wonders with you. Equally, a lot of this is rather new to me, so I would be very grateful for any assistance, corrections or further information on my specimens. Thank you. The Early Devonian epoch is split into three stages, so let's start with the first of those, the Lochkovian, that began about 419 mya and finished roughly 411 mya. I have been sent a nice selection of brachiopods from the Kalkberg Formation, Helderberg Group by the Mighty @Misha, mostly. But the kind gentleperson also sent me this fascinating little bryozoan hash : It is dominated by fenestellids, which is usually the case in the Devonian, but other orders sill occur. These ones, I think, are Fenestella, but there are so many species in the formation that I wont take a guess as to species : Not sure what this one is ;
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From the album: Fossildude's Lower Devonian Fossils
Platyostoma ventricosum Platyceratoid gastropods Lower Devonian Glenerie Limestone Tristates Group Route 9W Glenerie, N.Y.© 2023
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From the album: Fossildude's Lower Devonian Fossils
Cyrtina rostrata, from the Lower Devonian, Glenerie Limestone, Tristates Group, Route 9W, Glenerie, N.Y. Thanks to Adam (Tidgy's Dad) for the species ID.© 2023 Tim Jones
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From the album: Fossildude's Lower Devonian Fossils
Multiple exmples of Platyceras spirale - Lower Devonian, Glenerie Limestone: Tristates Group, Route 9W, Glenerie, N.Y.© 2023 T.Jones
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From the album: Fossildude's Lower Devonian Fossils
Poorly preserved phacopid cephalon. Phacops logani? Lower Devonian Glenerie Limestone Tristates Group Route 9W Glenerie, N.Y.© 2023
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From the album: Lower Devonian Kingston NY fossils
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From the album: Lower Devonian Kingston NY fossils
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From the album: Lower Devonian Kingston NY fossils
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From the album: Lower Devonian Kingston NY fossils
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From the album: Lower Devonian Kingston NY fossils
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From the album: Lower Devonian Kingston NY fossils
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From the album: Lower Devonian Kingston NY fossils
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From the album: Lower Devonian Kingston NY fossils
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From the album: Lower Devonian Kingston NY fossils
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From the album: Lower Devonian Kingston NY fossils
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From the album: Lower Devonian Kingston NY fossils
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From the album: Lower Devonian Kingston NY fossils
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From the album: Lower Devonian Kingston NY fossils
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From the album: Lower Devonian Kingston NY fossils
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From the album: Lower Devonian Kingston NY fossils
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From the album: Lower Devonian Kingston NY fossils
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From the album: Lower Devonian Kingston NY fossils
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From the album: Lower Devonian Kingston NY fossils
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