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Showing results for tags 'titanoceras?'.
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I found this cephalopod at the Lost Creek spillway site neat Jacksboro Texas. It's from the Finis Shale, Graham Formation, Upper Pennsylvanian. The largest dimension is 16 mm. It seems to be a replacement fossil so no sutures are showing and I don't know of any similar goniatites so that suggests a coiling nautiloid. The only thing I know of with a trapezoidal whorl cross-section like this is a Titanooceras and T. ponderosum has been found there but of course they are huge so it would have to be close to the protoconch. There is an off-center ridge going along the venter and the shell thickens greatly at the ventrolateral margins. I can check for any other features that might help with an ID. edit: It occurred to me that this may not be a cephalopod at all but a gastropod, Amphiscapha subrugosa but I haven't seen one with the ventral ridge. Ventral view Dorsal View
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