the fossils
gastropod
a snail in stone · coiled as they still are
The tell
A spiral. Either coiled flat in one plane or wound up into a spire.
A modern snail shell on the beach is not a fossil. A fossil one is stone all the way through and usually filled with rock.
What it gets mistaken for
- cephalopod
- brachiopod
- ammonite
- modern snail shell
The facts
- also calleda snail in stone · coiled the way they still are
- agemostly ~385 million yrs · Silurian ones ~430
- where it turns upstatewide in gravel · older ones at the Straits
- the field markone spiral coiling out from a center
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