>The two Sphaeriid valves (both seem to be the same valve but
> I don't know left from right when it comes to bivalves)

They are sphaeriid left valves.  The dentition is much weaker than in
the same-sized Corbicula.

> Second, I found two gastropod shells in the silty gravel which
> produced the
> Corbicula and Sphaeriid valves.

Anguispira, a land snail

> Last, to aid in getting an ID on the large clam, I made these two
> images:

Looks good for Strophitus undulatus.

--
Dr. David Campbell
425 Scientific Collections Building
Department of Biological Sciences
Biodiversity and Systematics
University of Alabama, Box 870345
Tuscaloosa AL 35487-0345  USA

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