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Showing results for tags 'aperture'.
Found 2 results
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From the album: Russian Upper Volgian ammonites
Rarely preserved bell-like aperture -
This specimen from the Finis Shale of Jacksboro Texas is the first example of a Pennsylvanian nautiloid showing part of the aperture that I have found or even seen. Maybe they are common and I just don't get out enough I believe this is Stenopoceras sp. and the attached clam is probably Pseudomonotis beedi since that's the only species of that genus I can't find an image of and the others on the fauna list have ribs that curve away from center. You can help me twice if you can confirm the clam ID and show us your nautiloid apertures for comparison. Outside of shell Inside surface Edge of possible aperture Margin showing profile wedging to a fine edge Close-up of edge profile before prep completed
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- aperture
- finis shale
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