BobWill Posted February 1, 2021 Share Posted February 1, 2021 I found this partial nautiloid at Jacksboro. Finis Shale member, Graham Formation, Pennsylvanian. The odd part is how deep the umbilicus is. There was just enough of it to see a piece of intact inner whorl for the profile and some septa to know about how much bigger it could have been if an adult. There was also a piece of the flank broken back with tubercles. I made the clay model of what it might have looked like whole but left off most of the tubercles. I will add photos comparing it to a Metacoceras fragment of about the same diameter that shows the depth from the flank to the previous whorl being about twice as wide. 1 Link to comment Share on other sites More sharing options...
BobWill Posted February 1, 2021 Author Share Posted February 1, 2021 You can see here the Metacoceras on the left has less than half the width of the umbilical wall as the unknown specimen. A similar sized Tainoceras is about the same as the Metacoceras. Link to comment Share on other sites More sharing options...
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