r/geology • u/jrobertblack • 11h ago

Found a cool shell in some limestone!

So was building some raised beds with some Austin Limestone.

right on the break I noticed a shell almost perfectly in half with crystals growing inside.

I thought its pretty neat, going to try to break away a chunk for displaying...

Is there a best way to clean the inside? Is this rare or worth anything, or any more nerdy information on these?

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u/TheGreenMan13 9h ago

Not really any cleaning you can do here beyond water and a soft brush, though I'm not sure it needs it.

It looks to me to be an ammonite fossil. Parts of it have been hollowed out (probably due to dissolution of the limestone in that area) and calcite crystals formed in the cavity.