Most likely. I found some up the Potomac last year after the storms. In Yorktown, that's most likely Miocene as is a lot of that part of VA. the long gone Rice's pit in Hampton was Miocene. Look for BIG shark's teeth in the area. The megalodon (or as I call it a chomp-o-saurus), the ancestor of the great white shark ate these whales. Yum yum.