Gramps Posted May 12, 2020 Share Posted May 12, 2020 Folks, These photos are from a small section of shale I picked up in Northeastern Oklahoma. The shale contains marine fossils of Pennsylvanian age. I have questions about a couple of the labeled objects. I’m thinking the center one may be a brachiopod (or possibly a bryzoan--it's hard to tell because of the crinoid plate resting above it). The one on the right looks to me like a bryzoan. However, I’m a novice at identification so I’d appreciate any opinions. The putative bryzoan appears to have grown on the crinoid stem. Best wishes. Link to comment Share on other sites More sharing options...
Tidgy's Dad Posted May 12, 2020 Share Posted May 12, 2020 The one on the right isn't a bryozoan, I don't think. For me that's a brachiopod squashed onto the crinoid stem, in part. The one in the middle, I'm not at all sure about either, some of the growth looks more like a coral, but could be a splatted brachiopod. 3 Life's Good! Tortoise Friend. Link to comment Share on other sites More sharing options...
TqB Posted May 12, 2020 Share Posted May 12, 2020 I think the middle one is a brachiopod - some productid ornamentation looks wavy like that and you can see shell edge at the top. I agree the other one looks like brachiopod, or possibly bivalve. 1 Tarquin Link to comment Share on other sites More sharing options...
DPS Ammonite Posted May 12, 2020 Share Posted May 12, 2020 1 hour ago, Gramps said: Folks, These photos are from a small section of shale I picked up in Northeastern Oklahoma. The shale contains marine fossils of Pennsylvanian age. The shells in the pictures (one circled) look like scallops such as Aviculopecten. Look for some wings. My goal is to leave no stone or fossil unturned. See my Arizona Paleontology Guide link The best single resource for Arizona paleontology anywhere. Link to comment Share on other sites More sharing options...
Gramps Posted May 12, 2020 Author Share Posted May 12, 2020 Thanks so much to all of you for your insights. I have a lot to learn, and I appreciate your willingness to help. Regarding the item in the right of the photos, I was puzzled by it's thinness and adherence to the shape of the underlying crinoid fragment (as shown in the crude diagram below). I had not seen shellfish to conform so well to the shape of substrate without fracturing. Again, thank you again for your help. Best wishes Link to comment Share on other sites More sharing options...
D.N.FossilmanLithuania Posted May 13, 2020 Share Posted May 13, 2020 Definitely brachiopod fragment and small scallop Link to comment Share on other sites More sharing options...
ClearLake Posted May 13, 2020 Share Posted May 13, 2020 I believe your bryozoan? is a bivalve as has been mentioned. It looks like it could be Pseudomonotis hawni (a relative of Aviculopecten) which is characterized by strong radial ribs with one to three smaller ribs between each primary. Each large rib has some spines along it and I believe you can see the bases of broken spines in your close up. That is a very nice piece of matrix with a lot going on! Link to comment Share on other sites More sharing options...
Gramps Posted May 14, 2020 Author Share Posted May 14, 2020 Thanks to all of you for the great information. I never would have guessed a bivalve could bend around a crinoid that way without breaking. Your posts have been very informative. Best wishes. Link to comment Share on other sites More sharing options...
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