Mr.Marcus Posted June 21, 2017 Share Posted June 21, 2017 Could someone please help me identify this fossil. I'm not sure if it is a plant or feather. My instincts tell me it is some sort of filtering sea plant. I found it while fossil hunting with my boys on top of small mountain approximately 3 miles west-northwest of Camp Wood, TX. The geologic atlas of Texas indicates that the formation is the Lower Devils River / Upper Glen Rose (Lower Cretaceous). The fossil is 1.5" x 0.5". Link to comment Share on other sites More sharing options...
ynot Posted June 21, 2017 Share Posted June 21, 2017 I think it is a rudist clam. 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...
BobWill Posted June 21, 2017 Share Posted June 21, 2017 It does appear to be a bivalve and could very well be a rudist since they must come in a variety of different shapes considering all of the fossils that get identified here as rudist. I usually just see broken pieces of them though so maybe someone else can give us the rest of the name. Link to comment Share on other sites More sharing options...
DPS Ammonite Posted June 21, 2017 Share Posted June 21, 2017 It looks like an inoceramus clam with both valves attached at a hingeline. See a photo of one by Ludwigia on TFF: 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...
ynot Posted June 21, 2017 Share Posted June 21, 2017 44 minutes ago, DPS Ammonite said: It looks like an inoceramus clam with both valves attached at a hingeline. I think You nailed it. 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...
lcordova Posted June 21, 2017 Share Posted June 21, 2017 I also think its a clam Link to comment Share on other sites More sharing options...
Wrangellian Posted June 21, 2017 Share Posted June 21, 2017 7 hours ago, DPS Ammonite said: It looks like an inoceramus clam with both valves attached at a hingeline. See a photo of one by Ludwigia on TFF: It's funny that you would post a link to an example from my neck of the woods... So I don't have to! The ornamentation on that is so close to the ones I find at my local spot, though it's oddly narrow and then there are those long striations on the side..? I never find them with articulated valves, either, but that's a difference in taphonomy of course. Link to comment Share on other sites More sharing options...
KCMOfossil Posted June 21, 2017 Share Posted June 21, 2017 Nice fossil! Link to comment Share on other sites More sharing options...
Mr.Marcus Posted June 23, 2017 Author Share Posted June 23, 2017 Not sure if this photo changes anyone's mind. What genus/species clam would this rudist be? I found it in the Glen Rose formation in SW Central Texas / Uvalde County (~3 miles northwest of Camp Wood). Link to comment Share on other sites More sharing options...
erose Posted June 23, 2017 Share Posted June 23, 2017 This is a bivalve, but not a rudist and it is not an inoceramid. It is either Inoperna concenticecostellata (Roemer) or possibly Modiolus banderensis (Whitney). I have been working on IDs for my own Glen Rose Formation and lower Fredericksburg Group fossils and have similar specimens. Modiolus may be the better ID based on size. It would help to have a photo from the other side since I can not tell if it is a closed or open specimen. It is a fairly decent specimen. As many of you know most of our regular bivalves do not preserve as anything more than a steinkern. Specimens like this with good detail are always welcome. Link to comment Share on other sites More sharing options...
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