Uh, so we can tell you any location in the world where you could get help, and that would be ok?
Honey, I think there are about a trillion snail shell fossils. It's not exactly going to be worth anything. Especially if you live in California and I tell you to go to Bombay India to have it "appraised"
....and how is someone supposed to email you if you haven't provided an email address.
also, why don't you just post a picture?