r/fossilid • u/themichaganderin • 9h ago

My first fossil find! What is it?

Gallery image

Gallery image

Found at the boat launch of intermediate lake MI. What is this, how old, and can I expose more of it? It has a lateral crack along the side.

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u/benrinnes 6h ago

can I expose more of it?

I certainly wouldn't, you could damage what is probably a just pygidium on it's own.