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Shell piece from Lower Permian marine i̶n̶v̶e̶r̶t̶e̶b̶r̶a̶t̶e̶, Kansas


trisk

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Found this amongst some loose pieces from our favourite cliffside in Manhattan, Kansas. Age is probably Lower Permian. There's a faint series of ridges on the concave side. Maybe part of a valve?

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10 minutes ago, Foozil said:

Can we have some close up pictures of below and above?

Here's my best try not to get it in shadow.

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Is this fossil porous? Does it stick to your tongue or lips? If so I'm fairly confident it is a tooth from a petalodont shark. It would be from the upper center part of the jaw. I'll try to post some images later.

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Here are some illustrations of Petalodont teeth. The first is from forum member LanceH found here. The second is from a publication "On the Relationships of the Petalodontiformes (Chondrichthyes)".

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petalodont.JPG

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Most of the surface appears relatively smooth, but there's an interesting pattern on convex side at the end with the two points (the grey crescent).

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Close up of the concave side:

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2 hours ago, Al Dente said:

Nice pictures. I'm confident it is a petalodont tooth. It looks complete.

Thanks! That makes it our first vertebrate finding here! Wish I could edit the topic now, haha.

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Nice Find,good pictures and good ID! :)

" We are not separate and independent entities, but like links in a chain, and we could not by any means be what we are without those who went before us and showed us the way. "

Thomas Mann

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