JamieLynn Posted March 15, 2020 Share Posted March 15, 2020 I found two of these little critters at Lake Jacksboro. I thought they were nautiloids based on the little round "hole" but upon photographing them, I can clearly see striations runing the length of the shell, more like a gastropod Euphemites, but the shape is not consistent with Euphemites but more nautiloid. Any help would be appreciated! Scale is in inches. First one: second one : Gastropod Euphemites for comparison: 2 www.fossil-quest.com Link to comment Share on other sites More sharing options...
erose Posted March 15, 2020 Share Posted March 15, 2020 Quick question: is that scale inches or millimeters? I’ll get out some books and take a look later today. 2 Link to comment Share on other sites More sharing options...
Rockwood Posted March 15, 2020 Share Posted March 15, 2020 I hope it's inches. One quarter of a millimeter doesn't quite compute. 2 Link to comment Share on other sites More sharing options...
RuMert Posted March 15, 2020 Share Posted March 15, 2020 Looks more like nautilus 1 My sites & reports Link to comment Share on other sites More sharing options...
JamieLynn Posted March 16, 2020 Author Share Posted March 16, 2020 Yes, inches. Sorry I forgot that www.fossil-quest.com Link to comment Share on other sites More sharing options...
erose Posted March 16, 2020 Share Posted March 16, 2020 I haven’t found a good match yet. But I’m leaning toward nautiloid over gastropod. 3 Link to comment Share on other sites More sharing options...
JamieLynn Posted March 16, 2020 Author Share Posted March 16, 2020 soooo.....found this on Missisipian nautiloids. They have those grooves. What are the chances these are Missisipian if it was in Finis Shale of Pennsylvanian? http://www.ammonoid.com/Lgranosum.html 1 www.fossil-quest.com Link to comment Share on other sites More sharing options...
erose Posted March 17, 2020 Share Posted March 17, 2020 Look at Agathiceras ciscoense. May also be a juvenile Liroceras. I don't know enough about Mississippian nautiloids to say. But possibly some genera may extend up into the Pennsylvanian. The general shape at first glance says Bellerophontid. But there are nautiloids that have that same sort of bell shape. 3 Link to comment Share on other sites More sharing options...
JamieLynn Posted March 17, 2020 Author Share Posted March 17, 2020 2 hours ago, erose said: Look at Agathiceras ciscoense. May also be a juvenile Liroceras. I don't know enough about Mississippian nautiloids to say. But possibly some genera may extend up into the Pennsylvanian. The general shape at first glance says Bellerophontid. But there are nautiloids that have that same sort of bell shape. That Agathiceras looks spot on! Thank you!!! www.fossil-quest.com Link to comment Share on other sites More sharing options...
JamieLynn Posted March 17, 2020 Author Share Posted March 17, 2020 oh and @erose - what is the name of the crinoid cups from Union Hill? These, that have no stem? www.fossil-quest.com Link to comment Share on other sites More sharing options...
KOI Posted March 18, 2020 Share Posted March 18, 2020 I just call them "floating" crinoids. Here are more pictures: http://nautiloid.net/fossils/sites/union_hill/union_hill.html I gave up on identifying the species a while ago. Here are some of my finds from the same area: 3 Link to comment Share on other sites More sharing options...
JamieLynn Posted March 18, 2020 Author Share Posted March 18, 2020 @erose - what a great video! Thank you!! Those are some amazing specimens. And I assume that's your daughter narrating? Too cute! www.fossil-quest.com Link to comment Share on other sites More sharing options...
erose Posted March 18, 2020 Share Posted March 18, 2020 I didn't post the video, but was a great little piece and very informative. The stemless crinoid is Paragassizocrinus. P. tarri is the most common species but I'm still not 100% sure how many species occur at Union Hill. PS The term "floating crinoid" gets bandied about for a bunch of very different echinoderms. Paragassizocrinus did not have a stem but is believed* to have lived sitting in the mud of the seafloor. By contrast there are Paleozoic crinoids such as Scyphocrinites that had a large bulbous form that was believed* to float in the water column. And then there are the Comatulids aka feather stars which still live in the ocean today. They are all crinoids and yet quite different. *As far as I know both are still just best guesses at actual life positions. 3 Link to comment Share on other sites More sharing options...
JamieLynn Posted March 18, 2020 Author Share Posted March 18, 2020 ohhhh....hahah..I didn't even look to see that it was KOI who posted the video.... assumed it was you, Erich! Sorry!! www.fossil-quest.com Link to comment Share on other sites More sharing options...
ClearLake Posted March 19, 2020 Share Posted March 19, 2020 I believe @erose is correct on Agathiceras ciscoense. It is a Pennsylvanian goniatite reported from the Graham Formation (which is the formation at Jacksboro). If you are looking at Jacksboro material, check out the DPS site devoted to this area: https://www.dallaspaleo.org/resources/Documents/PGUPFT 2b cephalopods.pdf There are a series of pictorial guides which can be very useful. 3 Link to comment Share on other sites More sharing options...
JamieLynn Posted March 19, 2020 Author Share Posted March 19, 2020 well, I did look there first and i apparently just didn't even see the striations on the drawing of the Agathiceras. So yeah..I need to look a little closer! www.fossil-quest.com Link to comment Share on other sites More sharing options...
Jeri Berlin Posted May 11, 2021 Share Posted May 11, 2021 Bellerophon sp. Gastropod 1 Link to comment Share on other sites More sharing options...
cngodles Posted May 11, 2021 Share Posted May 11, 2021 (edited) Going to agree with @Jeri Berlin, that looks very Bellerophon-ish. They do have the Cephalopod shape, but they are a snail. Here is some more information about the genus in general, with a find of mine: https://fossil.15656.com/2021/01/03/bellerophon-2/ But, I'm not sure. The shape does remind me more of a Cephalopod. Even with mine, it makes me wonder if it's a Pennoceras instead. Edited May 11, 2021 by cngodles Fossils of Parks Township - Research | Catalog | How-to Make High-Contrast Photos Link to comment Share on other sites More sharing options...
cngodles Posted March 7, 2023 Share Posted March 7, 2023 After revisiting this and working with similar specimens here, I would 100% call it Euphemites. Fossils of Parks Township - Research | Catalog | How-to Make High-Contrast Photos Link to comment Share on other sites More sharing options...
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