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ID help. Crustacean, mollusk, or something else? Upper carboniferous.


Gramps

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I have found several of these in an outcropping of shale and limestone in the Iola Formation in Northeastern Oklahoma (middle Pennsylvanian). The longest dimension is about 15 mm ( 5/8 inch). Some of the other specimens are slightly larger, but all have the same pattern of bumps. (I photographed this one because it shows the least wear.) I’m wondering it might be the carapace of a phyllocarid or some other crustacean. Alternatively, it might be a bivalve or other mollusk. Any help with ID would be appreciated. Focus and exposure were difficult, so there are several images.

Best wishes.

01 Top Darker.jpg

02 Top Lighter.jpg

03 Bumpy Side.jpg

04 Bumpy Side.jpg

05 Bottom.jpg

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Ammonite living chamber? :headscratch:

Accomplishing the impossible means only that the boss will add it to your regular duties.

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5 hours ago, daves64 said:

Ammonite living chamber? :headscratch:

The shell is rather thick, as a chamber wall might be. The pattern of bumps on the convex side has me stumped, though.

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