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ZinaBeth

Fossil or mineral

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ZinaBeth

Cheboygan Michigan they look like brains, I find them from baseball to basketball sizes. I broke one up with a sledge hammer, the center gets more dense. The out side seems to house shells? 

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ZinaBeth

image.jpg

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ynot

Need a scale on this piece.

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KimTexan

Looks like one of those very weathered shell conglomerates one sees at times.

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abyssunder

Hard to say for sure, but maybe there are cemented gastropod and brachiopod/bivalve remains.

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