Clam shell fossil?

[Ed_DE]

A swamp is being cleared out in Delaware & a lot of shells are being uncovered. Could this be a shell fossil and what type of shell is it?

 

[Blackfoot58]

A swamp is being cleared out in Delaware & a lot of shells are being uncovered. Could this be a shell fossil and what type of shell is it?

Looks possible to me. I don’t know the type.

 

[Red-Coat]

Neat. Looks like it might be a 'Gryphea' or 'Exogyra' species... both commonly known as 'Devil's Toenail':

Gryphaea - Wikipedia

en.wikipedia.org

Exogyra - Wikipedia

en.wikipedia.org

If so, it would have to be a fossil since both are long-extinct groups of the Oyster family. Exogyra, and Cretaceous would be more likely for Delaware, in which case those are neat finds.

 

[Ed_DE]

Neat. Looks like it might be a 'Gryphea' or 'Exogyra' species... both commonly known as 'Devil's Toenail':

Gryphaea - Wikipedia

en.wikipedia.org

Exogyra - Wikipedia

en.wikipedia.org

If so, it would have to be a fossil since both are long-extinct groups of the Oyster family. Exogyra, and Cretaceous would be more likely for Delaware, in which case those are neat finds.

Thanks Red-Coat for the help with the ID.