shel67 Posted July 11, 2017 Share Posted July 11, 2017 I found this in a dry rocky area of the North Sulphur River of Ladonia, Texas. Appears to be a half section of a layered cylinder of some sort compressed together. Any ideas? Link to comment Share on other sites More sharing options...
PaleoRon Posted July 11, 2017 Share Posted July 11, 2017 It appears to be a piece of bivalve shell. Link to comment Share on other sites More sharing options...
ynot Posted July 11, 2017 Share Posted July 11, 2017 One of them "rudist" things? @Uncle Siphuncle should know. 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...
shel67 Posted July 11, 2017 Author Share Posted July 11, 2017 Thanks guys!!! Link to comment Share on other sites More sharing options...
abyssunder Posted July 11, 2017 Share Posted July 11, 2017 Very tricky, in my opinion. The variants to chose could be: geological (Gypsum layers), inoceramid, Trichites, stromatoporoid, chaetetid sponge. A magnified image of the outer surface might help, I think. 1 " 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...
sharko69 Posted July 12, 2017 Share Posted July 12, 2017 I am thinking rudist clam. Link to comment Share on other sites More sharing options...
Chase B. Posted July 12, 2017 Share Posted July 12, 2017 Dear @shel67, I'd concur with the others in identifying that fossil as a fragment of rudist shell. Congratulations on your find! Regards, Chase Link to comment Share on other sites More sharing options...
shel67 Posted July 12, 2017 Author Share Posted July 12, 2017 Thanks guys!!! I appreciate all of your help! Link to comment Share on other sites More sharing options...
Uncle Siphuncle Posted July 12, 2017 Share Posted July 12, 2017 Partial rudists are rather plentiful at the NSR. Playing percentages, that's a good guess. Grüße, Daniel A. Wöhr aus Südtexas "To the motivated go the spoils." Link to comment Share on other sites More sharing options...
abyssunder Posted July 14, 2017 Share Posted July 14, 2017 I don't think it's rudist. 2 " 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...
Sagebrush Steve Posted July 14, 2017 Share Posted July 14, 2017 On 7/11/2017 at 4:29 PM, abyssunder said: Very tricky, in my opinion. The variants to chose could be: geological (Gypsum layers), inoceramid, Trichites, stromatoporoid, chaetetid sponge. A magnified image of the outer surface might help, I think. If it were gypsum it should be easy to tell. Gypsum is very soft, it is the holotype mineral representing a mohs hardness of 2. Try scratching it with a steel pocketknife. If you can make an obvious scratch then it is soft and could be gypsum. If not, it is a much harder material and might be a fossil. There is a whole topic on rudists here on this forum with plenty of pictures here: Rudists. Might want to compare yours with the posted pictures. 1 Link to comment Share on other sites More sharing options...
shel67 Posted July 15, 2017 Author Share Posted July 15, 2017 57 minutes ago, Sagebrush Steve said: If it were gypsum it should be easy to tell. Gypsum is very soft, it is the holotype mineral representing a mohs hardness of 2. Try scratching it with a steel pocketknife. If you can make an obvious scratch then it is soft and could be gypsum. If not, it is a much harder material and might be a fossil. There is a whole topic on rudists here on this forum with plenty of pictures here: Rudists. Might want to compare yours with the posted pictures. After looking at the photos of the Rudists, mine do favor the Hippurites??? Small pieces of course. These pieces were found along with the one I posted above. Link to comment Share on other sites More sharing options...
abyssunder Posted July 15, 2017 Share Posted July 15, 2017 Try to compare with these: pictures from here 2 " 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...
erose Posted July 15, 2017 Share Posted July 15, 2017 INOCERAMID shell. I'll put money* on it! *as if I had any to spare.... 2 Link to comment Share on other sites More sharing options...
abyssunder Posted July 15, 2017 Share Posted July 15, 2017 That's also a good possibility among the others , possibility which I excluded initially considering the multi-layered pattern and the dimensions. Seeing the picture below which reveals the contorted calcite layers of the hinge plate in Actinoceramus concentricus, I agree, it could be a potential candidate, although the scale is different, but inoceramids grew to giant size. 9, left valve with the synsecretionary contortions that occur in all shell layers at the umbonal end of the hinge plate; X13 excerpt from R. I. Knight, N. J. Morris. 2009. A reconsideration of the origins of the ‘typical’ Cretaceous inoceramid calcitic hinge plate in the light of new ultrastructural observations from some Jurassic 'inoceramids'. Palaeontology, Vol. 52, Part 5, pp. 963–989 I'm wondering why the specimens from the second picture of the O.P. resemble the fibrous satin spar. picture from here " 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...
BobWill Posted July 16, 2017 Share Posted July 16, 2017 Erose is right. Inoceramids are even more common that rudist clams in the north Sulfur., and abyssunder is also right. They can be very large there. Link to comment Share on other sites More sharing options...
Brazos Aaron Posted December 18, 2017 Share Posted December 18, 2017 I agree with Inoceramid shell. Looks just like some I found in Walnut Creek in Austin a few weeks ago. Link to comment Share on other sites More sharing options...
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