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This one has me stumped. I think it is the body whorl of a gastropod (DSR, Middle Devonian, Hamilton Group, Moscow Fm., Windom Shale). It is smashed, but the full circumference of the whorl is present, which means the aperture has to be on the left (which is consistent with the direction of the growth lines) (see arrow). If that is the case, there should be a shallow furrow or ridge in the center of the whorl running parallel with the cords and perpendicular to the growth lines if it were something like Mourlonia or even a Bellarophontacea. I see no evidence of such, not even on the crimpe
Does anyone know what part of the crinoid this element is? Is there enough there to assign a genus? It is 6-sided, and each side has a concavity. Pictured are top, bottom, and one side view. Scale in mm. Location & geological context in tags.
I've been experimenting with breaking down some Windom Shale from Penn-Dixie, and I think I have some ostracods: I have a few other interesting bits, too. Are these echinoid spines, micro-belemnite bits, or something else? And then there's this object: That's a small sampling. I also have found lots of brachiopod pieces, which is not surprising. The shale is rich in macrofossils, especially brachiopods, trilobites, horn corals, and occasional straight cephalopods.