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Concretion around a shell?

FedEx

By FedEx
in Fossil ID

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FedEx Newbie

FedEx

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I found this “rock” on a beach in Mississippi where I usually find late Miocene fossils. It has the overall shape and symmetry of a shell, and the inside of the hole has the texture of a shell. It feels very porous and light, and it weighs about 12.5 grams. I can scratch the rock with my fingernail, and it fizzles with a drop of vinegar. Anybody have any ideas about this thing?

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Rockwood Regular Member

Rockwood

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Bryozoan encrusted gastropod?

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FedEx Newbie

FedEx

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@RockwoodI think you’re right! I’ve never seen one before, but the pictures on google look identical. It’s probably modern then, right?

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Rockwood Regular Member

Rockwood

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16 minutes ago, FedEx said:

@RockwoodI think you’re right! I’ve never seen one before, but the pictures on google look identical. It’s probably modern then, right?

It could be modern, but I don't know how to tell. 

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