I have been going through some micro I collected at brownies beach (Calvert FM, Miocene. Zones 4 and 10 mostly) and this tooth looks a little strange to me. Its small, 5 MM about. I'm guessing its a Physogaleus contortus, but I'm not sure. Confirmation, other ideas, and any other information is welcome and encouraged. sorry about poor picture quality, USB microscope is a bit grainy.