Fig. 31 in Late Campanian (Cretaceous) Heteromorph Ammonites From The Western Interior Of The United States

Fig. 31. Part of the external suture of Didymoceras cheyennense (Meek and Hayden, 1856a). E is the external lobe, L is the lateral lobe, and U is the umbilical lobe. The heavy, straight line marks the middle of the venter. USNM 482461, USGS Mesozoic locality 23056 (fig. 2, loc. 6).Published as part of KENNEDY, W. J., LANDMAN, N. H., COBBAN, W. A. & SCOTT, G. R., 2000, Late Campanian (Cretaceous) Heteromorph Ammonites From The Western Interior Of The United States, pp. 1-88 in Bulletin of the American Museum of Natural History 2000 (251) on page 40, DOI: 10.1206/0003-0090(2000)2512.0.CO;2, http://zenodo.org/record/535042