Miocene. The very first bivalves that we find in the fossil record are tiny, but fully-formed bivalves, complete with two shells, a hinge, a ligament, and adductor muscle scars. Marine bivalve communities are relatively stable. Many species, from as early as the Miocene Epoch survive to the present.
UT Department of Environmental Sciences
The University of Toledo
Digital Initiatives, University of Toledo Libraries
environmental sciences; virtual exhibitions
"Phylum Mollusca, Class Bivalvia" (2017). Rock and Mineral Exhibit. 101.