| Ammonoids from the Lower Triassic Union Wash Formation, Union Wash, Inyo County, California. "Figures 1-8 Meekoceras gracilitatus; 1-3 side and rear views of a broken specimen, showing cross section of the younger whorls; 4-5 side and front views of a smaller specimen; 6 side view of a large specimen, showing the increasing evolution of the old whorl; 7-8 side and front views of an adolescent specimen." |