Lucid_Bot Posted May 6, 2023 Share Posted May 6, 2023 (edited) I have no idea what this is. It's unlike anything I have found. I split it out of Brush Creek Limestone today. Pennsylvanian Period, Glenshaw Formation. It's about 25 cm in circumference at the base. I would guess cephalopod, but it's much bigger than one's I've previously found. Help is appreciated, thanks! Edited May 6, 2023 by Lucid_Bot forgot formation Link to comment Share on other sites More sharing options...
Lucid_Bot Posted May 7, 2023 Author Share Posted May 7, 2023 (edited) This does look a bit like Glikmanius sp. (picture from @cngodles) : Edit: I see this specimen is much smaller to mine. Edited May 7, 2023 by Lucid_Bot Link to comment Share on other sites More sharing options...
cngodles Posted May 9, 2023 Share Posted May 9, 2023 (edited) The scale bar on my tooth there is 5 mm. I suspect it’s the steinkern of the cephalopod Poterioceras curtum, they grew to very large sizes and had a cone-like shape. That might be a siphuncle opening inside the smaller oval. It would be a smaller circular feature. This is one below, but it’s skewed and smashed. https://fossil.15656.com/catalog/specimen/CG-0500 Edited May 9, 2023 by cngodles Fossils of Parks Township - Research | Catalog | How-to Make High-Contrast Photos Link to comment Share on other sites More sharing options...
Lucid_Bot Posted May 9, 2023 Author Share Posted May 9, 2023 9 hours ago, cngodles said: I suspect it’s the steinkern of the cephalopod Poterioceras curtum, they grew to very large sizes and had a cone-link shape. I think your right. It looks extremely similar to Poterioceras curtum, conical and large. Thank you for all your help. Link to comment Share on other sites More sharing options...
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