Here is an interesting article on crescents. Too bad you can't read the whole thing. I never knew about them. Probably walked over dozens. I looked through my bucket of flint and maybe I have a couple I picked up for some reason.
https://books.google.com/books?id=N...0CCkQ6AEwAzge#v=onepage&q=great basin&f=false
https://books.google.com/books?id=N...0CCkQ6AEwAzge#v=onepage&q=great basin&f=false
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