Freshwater gastropods and a pelecypod from the middle Miocene Esmeralda Formation, Fossil Valley, Nevada. For perspective, the specimen at lower right (marked with letter A) is 30mm long. Photographed by author. Collected before Fossil Valley became a federally protected area; unauthorized collecting there is now strictly verboten.

All gastropods, except specimen marked letter "D." Letter A--Viviparus sp.; Letter B (four specimens to left, and three to the right of the letter)--Goniobasis sp.; Letter C--Valvata sp.; D--A pelecypod, Sphaerium. All the rest, without lettering--Vorticifex sp.