Can Somebody Please I.D. This Bivalve?

[Pterodactyl]

Hello. I got this fossil at a store and I forgot the name of the bivalve. Thank you!

[PaleoRon]

It looks like an oyster. Possibly Graphaea sp.

[Tennessees Pride]

I'll take a shot at it for you, it appears you may have a specimen of ostrea bryani.Although it is just hard to tell with no scale present. That type should be a small shell. Also, that would be assuming a late Cretaceous time period you recovered it from....

[Tennessees Pride]

The source the photos come from here is about 100 yr old, so I presume that name is still in use???

[Tennessees Pride]

If not that, could it be ostrea monmouthensis? My main study isn't in shells, but when I saw your pictures it reminded me of a shell specimen I'd recovered from the Coon Creek Formation previously. If per say, it turns out to be one of these, do you live around me???

[Pterodactyl]

I'll take a shot at it for you, it appears you may have a specimen of ostrea bryani.Although it is just hard to tell with no scale present. That type should be a small shell. Also, that would be assuming a late Cretaceous time period you recovered it from....

Cool. That name sounds familiar. Thank you!

[Pterodactyl]

It looks like an oyster. Possibly Graphaea sp.

Pretty sure it's not a gryphaea. This shell is more circular. Thanks for your help though!

[Guguita2104]

Exogyra sp.,IMO

[Tennessees Pride]

Cool. That name sounds familiar. Thank you!

Sir, you're welcome.