Plate 18 From United States Geological Survey Professional Paper 167

Lower Triassic Ammonoids Of North America

By James Perrin Smith


Ammonoids from the Lower Triassic Union Wash Formation, Union Wash, Inyo County, California. "Figures 1-7 Meekoceras (Koninckitis) mushbachanum; 1-2 side view and septum of a large specimen; 3-5 side and rear views and septum of a smaller specimen; 6-7 side and front views of an immature specimen."

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