Allodon Posted November 21, 2020 Share Posted November 21, 2020 Hi everybody, I was wondering if you could help me with this. I found this rock among the Ames Limestone around Pittsburgh. The limestone's chock full of crinoids and corals, but I wasn't sure what this fragment was. It looks like it might be from a cephalopod (belemnites or bactrites maybe?), but I'm really not positive. Could you guys help me out here? Thanks! Link to comment Share on other sites More sharing options...
Tidgy's Dad Posted November 21, 2020 Share Posted November 21, 2020 Yes, I think you're on the right lines with orthoconic nautiloid. 1 Life's Good! Tortoise Friend. Link to comment Share on other sites More sharing options...
Allodon Posted November 21, 2020 Author Share Posted November 21, 2020 Awesome! Thanks! Link to comment Share on other sites More sharing options...
JamieLynn Posted November 21, 2020 Share Posted November 21, 2020 second the Cephalopod! www.fossil-quest.com Link to comment Share on other sites More sharing options...
historianmichael Posted November 21, 2020 Share Posted November 21, 2020 My guess is that it is a heavily weathered cross section of a crinoid stem. I believe I see other crinoid columnals on the block. 1 Follow me on Instagram (@fossil_mike) to check out my personal collection of fossils collected and acquired over more than 15 years of fossil hunting! Link to comment Share on other sites More sharing options...
connorp Posted November 21, 2020 Share Posted November 21, 2020 4 minutes ago, historianmichael said: My guess is that it is a heavily weathered cross section of a crinoid stem. I believe I see other crinoid columnals on the block. This is what I was about to say as well. Link to comment Share on other sites More sharing options...
Thomas.Dodson Posted November 21, 2020 Share Posted November 21, 2020 Can we get close-up pictures of the fossil and pictures of the edges of the narrow sides (if possible)? It might help decide between an orthocone cephalopod and a worn/distorted crinoid columnal section. Link to comment Share on other sites More sharing options...
Allodon Posted November 21, 2020 Author Share Posted November 21, 2020 Hey guys, thanks for the responses. I'm gonna try to remove it from the rock if I can, so I'll send pictures after that if I'm successful. There definitely are pieces of crinoid in the rock around it, but the slight trapezoidal shape seemed off for a crinoid to me. I've attached are the best pictures of the edges I could get as it is. (The zig-zag pattern between a few of the segments is now also making me think it might just be a really weathered crinoid segment) Link to comment Share on other sites More sharing options...
rwise Posted November 21, 2020 Share Posted November 21, 2020 Looks like crinoid is the answer.......more on the same plate Thanks for your help in advance. Link to comment Share on other sites More sharing options...
BobWill Posted November 23, 2020 Share Posted November 23, 2020 The slight taper is what makes it look more like a nautiloid but the close-ups reveal the crenella. The taper is probably because it got crushed on one end. Link to comment Share on other sites More sharing options...
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