Péricles Posted November 18, 2019 Share Posted November 18, 2019 Hello guys, I've just received two curious rocks that supposedly contains real trilobite fossils, the most curious thing on these rocks is that they look like a trilobite cemetery, there is a lot of trilobite parts. (it comes from China), have you ever seen such specimens? Can you confirm that these rocks contains dozens of different trilobites? Thanks in advance. Link to comment Share on other sites More sharing options...
Misha Posted November 18, 2019 Share Posted November 18, 2019 Those look like fragments, primary cephalons of Redlichia chinensis from the Cambrian of China. They definitely come from multiple different ones. Here is one that is mostly complete in my collection. 1 Link to comment Share on other sites More sharing options...
Tidgy's Dad Posted November 18, 2019 Share Posted November 18, 2019 I can't see what's going on exactly in those pictures, but, yes, multiple trilobite bits or many whole specimens in a death assemblage are not uncommon. This is where current action moves many corpses together into one place where they are covered with sediment and then preserved. 2 Life's Good! Tortoise Friend. Link to comment Share on other sites More sharing options...
Randyw Posted November 18, 2019 Share Posted November 18, 2019 There are multiple trilobite bits in here. The way they are jumbled I suspect it may be a molt plate... 4 Link to comment Share on other sites More sharing options...
Fossildude19 Posted November 18, 2019 Share Posted November 18, 2019 The pygidiums look to be Drepanura sp. These are available, relatively inexpensively, on auction sites. 3 Tim - VETERAN SHALE SPLITTER VFOTM --- APRIL - 2015 __________________________________________________ "In every walk with nature one receives far more than he seeks." John Muir ~ ~ ~ ~ ><))))( *> About Me Link to comment Share on other sites More sharing options...
Misha Posted November 18, 2019 Share Posted November 18, 2019 10 minutes ago, Randyw said: There are multiple trilobite bits in here. The way they are jumbled I suspect it may be a molt plate... I think this is most likely as the "cheeks" of the top trilos are all missing. Link to comment Share on other sites More sharing options...
grandpa Posted November 18, 2019 Share Posted November 18, 2019 There is an exposure of a Cambrian age shale in Texas associated with the Llano Uplift (batholith) that is chock full of trilo molt pieces. This specimen reminds me very much of that. 4 Link to comment Share on other sites More sharing options...
Misha Posted November 18, 2019 Share Posted November 18, 2019 59 minutes ago, grandpa said: There is an exposure of a Cambrian age shale in Texas associated with the Llano Uplift (batholith) that is chock full of trilo molt pieces. This specimen reminds me very much of that. I really need to check that out! Didn't even know Texas had any Cambrian fossils. Link to comment Share on other sites More sharing options...
Wrangellian Posted November 18, 2019 Share Posted November 18, 2019 Nor did I! Please show pics if you've got any, grandpa. Link to comment Share on other sites More sharing options...
grandpa Posted November 18, 2019 Share Posted November 18, 2019 59 minutes ago, Wrangellian said: Please show pics if you've got any, grandpa. Sorry, I do not. For reference, you might be interested in: Upper Franconian and Lower Trempealeauan Cambriantrilobites and brachiopods, Wilberns Formation, central Texas, WC Bell, HL Ellinwood - Journal of Paleontology, 1962 Trilobites of the Upper Cambrian Ptychaspid Biomere Wilberns Formation, central Texas SA Longacre - Memoir (The Paleontological Society), 1970 Late Cambrian and Early Ordovician Faunas from the Wilberns Formation of Central Texas DON WINSTON and HARRY NICHOLLS The missisquoiid trilobite Parakoldinioidia Endo 1937 in the uppermost Cambrian of Oklahoma and Texas, and its biostratigraphic significance STEPHEN R. WESTROP & JONATHAN M. ADRAIN Hope this helps some. 7 Link to comment Share on other sites More sharing options...
Wrangellian Posted November 19, 2019 Share Posted November 19, 2019 Well it might if I ever get the means to view the figures in those papers, but thanks anyway. I wonder why these are not more well-known, and why none of our Texas members have collected there, or have they and nothing could be found or the fossils are not very spectacular? Link to comment Share on other sites More sharing options...
Northern Sharks Posted November 19, 2019 Share Posted November 19, 2019 We have similar areas here in Ontario that contain hundreds of pieces of Pseudogygites trilobites. They are almost entirely molted parts (exuviae) and, here anyway, are mostly pygidia. To get an idea what likely happened, imagine leaves in a body of water. The wind and current combine to "gather" the leaves into certain areas, while other areas are clear. Anyone who fishes has likely seen this scenario. Trilobite exuviae, having a relatively large surface area and a very light weight, would behave in much the same way as the leaves. 2 There's no limit to what you can accomplish when you're supposed to be doing something else Link to comment Share on other sites More sharing options...
Kane Posted November 19, 2019 Share Posted November 19, 2019 Just to illustrate Kevin’s example, a typical hash plate from Ottawa with that species: ...How to Philosophize with a Hammer Link to comment Share on other sites More sharing options...
Péricles Posted November 20, 2019 Author Share Posted November 20, 2019 Thank you guys, you are awesome!!! Link to comment Share on other sites More sharing options...
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