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for me it looks like an interestingly eroded rock.

Cool top jaw

This is a weird and very interesting item. It looks like a lamnid shark had its jaws preserved in a very odd way. A scale with the item would be very useful to get an idea of the size. Was there any more of this where it was found or similar pieces?

I see lithification, which is a sign of a sedimentary rock, where fossils are found. I’m not certain if this is a shark jaw, but it is something very interesting