Bivalve IDs from SC coast

[cthamon]

All of these were found beach combing in Charleston, SC and all were caked with what I believe is limestone. 

 

A. Not sure on this one. Thought clam before pulling away some limestone but now thinking oyster? About 5cm wide.

 

 

 

 

B. Scallops, wondering type and age if identifiable About 3 cm tall.

 

 

 

C. Was thinking scallop on this one but it doesn’t seem to have the same vertical lines, they’re all horizontal. Roughly 9cm tall.

 

Thank you all in advance! I’ll be posting some corals and bones tomorrow if I have no luck finding anything myself

[fifbrindacier]

Hi, A is an Oyster, you're right.

[cthamon]

Looking like Actinostreon marshii for the oyster, but SC supposedly has a gap in rock records/fossils between the Cambrian and Cretaceous period. Would this be properly placed in mid Jurassic or is it a similar looking younger species? 

[Rockwood]

Ostrea falcata is found in the Cretaceous.

It's not an ID though, just a suggestion.

[Al Dente]

The oysters look similar to Conradostrea that I find in the Pliocene of North Carolina. I think the material around Charleston is Oligocene and younger.

[MikeR]

My understanding is that renourishment at Folly Beach a couple of years ago brought up a bunch of Upper Pliocene Goose Creek Limestone.  Eric is correct concerning Conradostrea sculpturata.  The pecten is Nodipecten peedeensis.  The other I would need some additional views.

 

Mike

[cthamon]

3 hours ago, MikeR said:

My understanding is that renourishment at Folly Beach a couple of years ago brought up a bunch of Upper Pliocene Goose Creek Limestone.  Eric is correct concerning Conradostrea sculpturata.  The pecten is Nodipecten peedeensis.  The other I would need some additional views.

 

Mike

I don’t know if the shape or deep grooves match up with C. sculpturata, potentially O. Locklini? Or C. Lawrencei?