Perhaps they are related. Was G. arcuata a terrestrial, fresh water, or marine critter?

---- John Wolff <[log in to unmask]> wrote: 

=============
They look like Gryphaea arcuata (Lamarck, 1801) I have from England's 
Lower Sinemurian, Jurassic (200-150Ma).  I believe they are called 
"Devils' toenails"

John

At 08:33 PM 1/07/16, you wrote:
>ASU has just received this lovely fossil snail from Fred Skillman, 
>an amateur entomologist who found it in a wash on private land near 
>Delicate Arch, Arches National Park, Utah. It is such a treasure for 
>me because it actually has what appears to be fossilized animal and 
>an operculum which became separated when he was cleaning off 
>caked-on dirt. I just had to share with all of you. We think it may 
>date back to the Jurassic.
>
>To see 5 photos just copy and paste the following link onto your 
>search engine.
>
>https://drive.google.com/drive/folders/0B-Vz8pRKgeC8M1NLa1k4U2VZNDg=============
>
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