Micah Posted April 11, 2017 Share Posted April 11, 2017 I was going through fossils I found as a kid and I came across this one. It was in a box with mainly brachiopods and bivalves from the Indian Cave limestone, so I assume it also came from there. This is my first post so please forgive anything wrong with the pictures. Any help to Id this would be appreciated! Link to comment Share on other sites More sharing options...
ynot Posted April 11, 2017 Share Posted April 11, 2017 Welcome to TFF! Can not help with id, but it is an interesting looking thing. Tony Darwin said: " Man sprang from monkeys." Will Rogers said: " Some of them didn't spring far enough." My Fossil collection - My Mineral collection My favorite thread on TFF. Link to comment Share on other sites More sharing options...
abyssunder Posted April 11, 2017 Share Posted April 11, 2017 It looks like a Bellerophon gastropod, to me. " We are not separate and independent entities, but like links in a chain, and we could not by any means be what we are without those who went before us and showed us the way. " Thomas Mann My Library Link to comment Share on other sites More sharing options...
Micah Posted April 11, 2017 Author Share Posted April 11, 2017 It doesn't look like a Bellerophon to me. Possibly a gastropod, but the ridges are wrong and it almost looks like it is a bivalve from the top view... thanks for the responses though! Link to comment Share on other sites More sharing options...
Peat Burns Posted April 11, 2017 Share Posted April 11, 2017 Not sure of the time period from which this came, but one taxon you might check into for comparison purposes (if the time range fits your site of collection) is Platyceras. This genus spans the Silurian through Pennsylvanian in the Palaeozoic era. Is the site from which yours came Pennsylvanian? Several species can have varying degrees of carinae / ridges similar to yours (examples in the Devonian with such ridges include P. carinatum and P. bucculentum). There may be Pennsylvanian representatives with similar morphology. These shells can have considerable "intraspecific" variation with regard to the shell morphology. Hard to tell from photos whether that is a good match or not, but worth checking... 1 Link to comment Share on other sites More sharing options...
abyssunder Posted April 11, 2017 Share Posted April 11, 2017 Sorry to say, but pictures are bit blurry. Can you take some clearer shots from the front and lateral sides? " We are not separate and independent entities, but like links in a chain, and we could not by any means be what we are without those who went before us and showed us the way. " Thomas Mann My Library Link to comment Share on other sites More sharing options...
Micah Posted April 11, 2017 Author Share Posted April 11, 2017 1 hour ago, Peat Burns said: Not sure of the time period from which this came, but one taxon you might check into for comparison purposes (if the time range fits your site of collection) is Platyceras. This genus spans the Silurian through Pennsylvanian in the Palaeozoic era. Is the site from which yours came Pennsylvanian? Several species can have varying degrees of carinae / ridges similar to yours (examples in the Devonian with such ridges include P. carinatum and P. bucculentum). There may be Pennsylvanian representatives with similar morphology. These shells can have considerable "intraspecific" variation with regard to the shell morphology. Hard to tell from photos whether that is a good match or not, but worth checking... I think you might be onto something with Platyceras. Especially P. carinatum, seems to have approximately the same shell structure, but doesn't have the ridges. Maybe these pictures can help. Link to comment Share on other sites More sharing options...
Peat Burns Posted April 11, 2017 Share Posted April 11, 2017 2 minutes ago, Micah said: I think you might be onto something with Platyceras. Especially P. carinatum, seems to have approximately the same shell structure, but doesn't have the ridges. Maybe these pictures can help. Hmmm. With the new photos, now I'm not so sure. I'm seeing the ridges perpendicular to the carinae that I think @abyssunder was seeing / referencing. Those seem unlike anything I've seen in platyceras. Link to comment Share on other sites More sharing options...
Micah Posted April 11, 2017 Author Share Posted April 11, 2017 Okay, haha I really have no idea, I don't have anything even remotely like it. Link to comment Share on other sites More sharing options...
Peat Burns Posted April 11, 2017 Share Posted April 11, 2017 This is what I think has us leaning gastropod or monoplacophoran: But maybe that's not the umbilicus we think it is? Hopefully others will chime in. A bit of matrix removal might help. Link to comment Share on other sites More sharing options...
Micah Posted April 11, 2017 Author Share Posted April 11, 2017 Just now, Peat Burns said: This is what I think has us leaning gastropod or monoplacophoran: But maybe that's not the umbilicus we think it is? Hopefully others will chime in. A bit of matrix removal might help. I had the same thought with the umbilicus. Someone I showed it to awhile who is more familiar with these sorts of things wondered if it could be some sort of trilobite rolled up... I'll see what I can remove. Link to comment Share on other sites More sharing options...
Micah Posted April 11, 2017 Author Share Posted April 11, 2017 I don't know y'all, it's got a really tough matrix and I don't have the proper tools to remove it safely. Tried to take a bit off from around the potential umbilicus, but I'm afraid I'll damage it if I push much harder Link to comment Share on other sites More sharing options...
abyssunder Posted April 12, 2017 Share Posted April 12, 2017 I think that the radial ridges are going bilaterally to the central point of the evolvement with a perpendicular double-row of longitudinal ridges along the enrolling surface. I haven't a better resemblance than this: link to source " We are not separate and independent entities, but like links in a chain, and we could not by any means be what we are without those who went before us and showed us the way. " Thomas Mann My Library Link to comment Share on other sites More sharing options...
Micah Posted April 12, 2017 Author Share Posted April 12, 2017 Hmmmm I don't see it, but maybe... Link to comment Share on other sites More sharing options...
Micah Posted April 12, 2017 Author Share Posted April 12, 2017 @RCFossils @fossilized6s @digit @fiddleheadI've seen y'all called "the experts" any idea what this is? I believe it's from the Indian Cave limestone member and is late Pennsylvania-early Permian. Link to comment Share on other sites More sharing options...
Peat Burns Posted April 12, 2017 Share Posted April 12, 2017 @Micah, are you familiar with this book? https://www.google.com/url?sa=t&source=web&rct=j&url=http://digitalcommons.unl.edu/cgi/viewcontent.cgi%3Farticle%3D1002%26context%3Dconservationsurvey&ved=0ahUKEwje05bogZ7TAhVIfiYKHUrgAiYQFggjMAQ&usg=AFQjCNG2JbEYwtHp6P68Q2ngavFVXpoGrg The illustrations are not that great, but it gives you some Pennsylvanian and Permian Mollusca (and other) taxa known from Nebraska that you can start comparing (using better images online and elsewhere). 2 Link to comment Share on other sites More sharing options...
Micah Posted April 12, 2017 Author Share Posted April 12, 2017 14 minutes ago, Peat Burns said: @Micah, are you familiar with this book? https://www.google.com/url?sa=t&source=web&rct=j&url=http://digitalcommons.unl.edu/cgi/viewcontent.cgi%3Farticle%3D1002%26context%3Dconservationsurvey&ved=0ahUKEwje05bogZ7TAhVIfiYKHUrgAiYQFggjMAQ&usg=AFQjCNG2JbEYwtHp6P68Q2ngavFVXpoGrg The illustrations are not that great, but it gives you some Pennsylvanian and Permian Mollusca (and other) taxa known from Nebraska that you can start comparing (using better images online and elsewhere). Thanks Peat, I don't have this specific book, but I do have another by the same author specifically for my part of the state (thankfully with photos)! I've gone through it and now the one you sent and they are none that go beyond vaguely resembling it... Link to comment Share on other sites More sharing options...
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