All my collecting is on scuba on a single stretch of local reef (about
130 species so far) here in SoFla.

I also spend some time bicycling the berms in the Everglades. At my age,
I spend a lot of time on the ground
resting. The berms are dredged from the canals alongside, then topped
and filled with stuff from wherever
they could get it. Both the fill and the dredged stuff are full of
shells, all of which are the same shade of white.
I've started crunching  some and most are obviously not fossils but a
few appear to be.

I'm sure you fossil hunters don't crunch stuff, so...  How does one tell
a fossil from a very old shell?

tia
m

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