Hi, @sean-mccrea – we can update your taxonomy to be Phylum Molluca > Class Bivalvia at least. If you want to try to identify it further check out the bivalve species on Neogene Atlas: https://neogeneatlas.net/species/

Do you remember where you found this specimen? Thanks, Jen

Hi, @sean-mccrea – similar to my last comment you can update your taxonomy to include Phylum Mollusca > Class Bivalvia and check out the Neogene Atlas to narrow it down further: https://neogeneatlas.net/species/

Do you remember where you found this specimen?

If you are interested in narrowing down the geologic context check out macrostrat: https://macrostrat.org/map/#/z=10.2/x=-76.7939/y=35.3504/bedrock/lines/