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Showing results for tags 'grypoceratid'.
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Stenopoceras, nautiloid from the Finis Shale of Texas
BobWill posted a topic in General Fossil Discussion
I found my first Stenopoceras sp. from the Finis Shale member of the Graham Formation at Jacksboro Texas. I thought it was an oddly-shaped version of the more common Grypoceratid from there, Domatoceras scuptile until I noticed the concave venter. I went through my drawer of Domatoceras fragments and found another partial one after I studied the differences a little. That one was just part of one side and had nothing of the venter but a part of the apertural margin was showing, something I don't remember seeing before. Both are external casts so no sutures but the faint growth lines are visible. The phragmocone is crushed and I believe the septum is the last one so most of the specimen is the body chamber which is about 67mm across. Those holes sure look like punctures and the shell is mostly gone from the opposite flank. This view shows the crushed phragmocone and the septum for a look at the whorl profile which is taller than the more "squatty" Domatoceras. It was in about 7 pieces and I just now figured out where the last one fit. I hope I got all of it that was still there.- 4 replies
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- graham formation
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