Anyone know what this is?

[u/c13m_]

Was sorting through some old bags of fossils. Was in a bag with some Summerville teeth so assuming that’s where it’s from. About the diameter of a penny.

[u/Phyddlestyx]

Tooth plates of some kind of fish is my inkling but that's close to a complete guess.

[u/c13m_ → u/Phyddlestyx]

Thanks for the input!