Fig. 31. A in Scaphites Of The ''Nodosus Group'' From The Upper Cretaceous (Campanian) Of The Western Interior Of North America

Fig. 31. A. Plot of W1/H1 versus V4/H4 in macroconchs of Hoploscaphites nodosus (Owen, 1852) and H. brevis (Meek, 1876), Pierre Shale and Bearpaw Shale, Baculites compressus–B. cuneatus zones. The arrow represents the variation in W1/H1 in seven specimens from two concretions in the Pierre Shale, AMNH loc. 3274, Meade County, South Dakota. B. Plot of LMAX/H4 versus V4/H4 in macroconchs of Hoploscaphites nodosus and H. brevis, Pierre Shale and Bearpaw Shale, Baculites compressus–B. cuneatus zones.