Location:

Calvert Cliffs of MD

~ 22-8 Million Years Old
Early to Middle Miocene
Chesapeake Group: Calvert, Choptank, and St. Mary's Formations

Amy found this ray plate still in matrix. It is tough to spot. It is still hard to spot, even when circled. You are looking straight down at it.

Here she is holding up the two pieces still in the pebble.