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Fig. 19. A C in Late Campanian (Cretaceous) Heteromorph Ammonites From The Western Interior Of The United States

Fig. 19. A C. Nostoceras monotuberculatum Kennedy and Cobban, 1993a. A, B. USNM 482470, USGS Mesozoic locality D7028 (fig. 2, loc. 46). C. BHMNH 2093, collected by N.L. Larson from the Pierre Shale in the N½ sec. 13, T. 7 S., R. 7 E., Fall River County, S. Dak. D I. Didymoceras stevensoni (Whitfield, 1877). D. USNM 482437, USGS Mesozoic locality 23528 (fig. 2, loc. 7). E, F. USNM 482438, USGS Mesozoic locality D454 (fig. 2, loc. 17). G. USNM 482439, USGS Mesozoic locality 22935 (fig. 2, loc. 29). H, I. USNM 482440, USGS Mesozoic locality D1387 (fig. 2, loc. 27). Figures are ×1.

Fig. 16. A C in Late Campanian (Cretaceous) Heteromorph Ammonites From The Western Interior Of The United States

Fig. 16. A C. Restorations of parts of the juvenile whorls of Didymoceras stevensoni (Whitfield, 1877). Stipple board drawing by John R. Stacy. Figures are ×1.

Fig. 13. A, B in Late Campanian (Cretaceous) Heteromorph Ammonites From The Western Interior Of The United States

Fig. 13. A, B. Didymoceras nebrascense (Meek and Hayden, 1856a). USNM 482434, USGS Mesozoic locality D1422 (fig. 2, loc. 13). Figures are ×1.

Fig. 22 in Late Campanian (Cretaceous) Heteromorph Ammonites From The Western Interior Of The United States

Fig. 22. Didymoceras stevensoni (Whitfield, 1877). A. USNM 482447, USGS Mesozoic locality D625 (fig. 2, loc. 62). B. USNM 482448, USGS Mesozoic locality D454 (fig. 2, loc. 17). Figures are ×1.

Fig. 7. A, B in Late Campanian (Cretaceous) Heteromorph Ammonites From The Western Interior Of The United States

Fig. 7. A, B. Didymoceras nebrascense (Meek and Hayden, 1856a). USNM 482429, USGS locality D1422 (fig. 2, loc. 13). Figures are ×1.

Fig. 3 in Late Campanian (Cretaceous) Heteromorph Ammonites From The Western Interior Of The United States

Fig. 3. Restoration of Didymoceras nebrascense (Meek and Hayden, 1856a). Stipple board drawing by John R. Stacy. Figure is reduced ×0.90.

Fig. 21 in Late Campanian (Cretaceous) Heteromorph Ammonites From The Western Interior Of The United States

Fig. 21. Didymoceras stevensoni (Whitfield, 1877). A. USNM 482445, USGS Mesozoic locality D1498 (fig. 2, loc. 56). B. USNM 482446, USGS Mesozoic locality D3789 (fig. 2, loc. 50). Figures are ×1.

Fig. 2 in Late Campanian (Cretaceous) Heteromorph Ammonites From The Western Interior Of The United States

Fig. 2. Index map of part of the Western Interior of the United States showing localities of heteromorph ammonites described or mentioned in the text. Numbers refer to USGS Mesozoic localities listed in appendix 1.

Fig. 18 in Late Campanian (Cretaceous) Heteromorph Ammonites From The Western Interior Of The United States

Fig. 18. Index map of part of the Western Interior of the United States showing localities of Didymoceras stevensoni (Whitfield, 1877). An x may indicate one or several nearby localities. Numbers refer to USGS Mesozoic localities mentioned in the text. Dashed line marks the approximate position of the western shoreline of the Western Interior Seaway during D. stevensoni zone time.

Fig. 6 in Late Campanian (Cretaceous) Heteromorph Ammonites From The Western Interior Of The United States

Fig. 6. Didymoceras nebrascense (Meek and Hayden, 1856a). A. USNM 482427, USGS Mesozoic locality D1421 (fig. 2, loc. 12). B. USNM

Fig. 12. A, B in Late Campanian (Cretaceous) Heteromorph Ammonites From The Western Interior Of The United States

Fig. 12. A, B. Didymoceras nebrascense (Meek and Hayden, 1856a). USNM 482433, USGS Mesozoic locality D1422 (fig. 2, loc. 13). Figures are ×1.

Fig. 9. A, B in Late Campanian (Cretaceous) Heteromorph Ammonites From The Western Interior Of The United States

Fig. 9. A, B. Didymoceras nebrascense (Meek and Hayden, 1856a). YPM 6131A, plaster cast of Hyatt's (1894) second specimen described as Emperoceras beecheri, Pierre Shale near Buffalo Gap, S. Dak. Figures are ×1.

Fig. 8. A, B in Late Campanian (Cretaceous) Heteromorph Ammonites From The Western Interior Of The United States

Fig. 8. A, B. Didymoceras stevensoni (Whitfield, 1877). BHMNH 4039, collected by Howard Ehrle, Pierre Shale of Carter County, Mont. C, D. Didymoceras nebrascense (Meek and Hayden, 1856a). C. USNM 482430, USGS Mesozoic locality D85 (fig. 2, loc. 23). D. YPM 6131B, plaster cast of one of two specimens described by Hyatt (1894) as the new genus and species Emperoceras beecheri, Pierre Shale near Buffalo Gap, S. Dak. Figures are ×1.

Fig. 11 in Late Campanian (Cretaceous) Heteromorph Ammonites From The Western Interior Of The United States

Fig. 11. Didymoceras nebrascense (Meek and Hayden, 1856a). A, B. USNM 482432, USGS Mesozoic locality D2148 (fig. 2, loc. 10). C. USNM 450333, USGS Mesozoic locality D1422 (fig. 2, loc. 13). Figures are ×1.

Fig. 17 in Late Campanian (Cretaceous) Heteromorph Ammonites From The Western Interior Of The United States

Fig. 17. Part of the external suture of Didymoceras stevensoni (Whitfield, 1877). E is the external lobe and L is the lateral lobe. The heavy, straight line marks the middle of the venter. USNM 482436, USGS Mesozoic locality D4446 (fig. 2, loc. 47).

Fig. 15. A–C in Late Campanian (Cretaceous) Heteromorph Ammonites From The Western Interior Of The United States

Fig. 15. A–C. Three views of the holotype of Helicoceras stevensoni Whitfield, 1877 (from Whitfield, 1880: pl. 14, figs. 5–7). Figures are

FIG. 6 in Albanerpetontid Amphibians from the Upper Cretaceous (Campanian and Maastrichtian) of North America

FIG. 6. — Frontals of Albanerpeton nexuosus Estes, 1982 and A. galaktion Fox & Naylor, 1981, lower Campanian (Aquilan in age), Alberta; A-E, A. nexuosus; A, B, UALVP 39996, fused frontals lacking anterior and posterior ends, A, dorsal view, B, ventral view; C, UALVP 39983, anterior part of fused frontals, dorsal view; D, UALVP 39989, posterior part of left frontal, ventral view; E, UALVP 39987, fragmentary fused frontals, ventral view; F-K, A. galaktion; F, G, UALVP 16216, fused and incomplete frontals missing anteri- or end of bone and posterior end of both ventrolateral crests, F, dorsal view, G, ventral view; H, UALVP 39946, anterior part of fused frontals, dorsal view; I, J, UALVP 39945, posterior one-half of fused frontals missing posterior end of both ventrolateral crests, I, dorsal view, J, ventral view; K, UALVP 39951, right posterior part of fused frontals, ventral view. All specimens are from the Milk River Formation. Scale bars: 1 mm.

FIG. 3 in Albanerpetontid Amphibians from the Upper Cretaceous (Campanian and Maastrichtian) of North America

FIG. 3. — Maxillae of Albanerpeton nexuosus Estes, 1981 and A. galaktion Fox & Naylor, 1982; Campanian and Maastrichtian (Aquilan to Lancian in age), North American Western Interior; A-H, A. nexuosus; A, B, UALVP 16242, incomplete right maxilla; A, labial view, B, lingual view; C, UALVP 39973, incomplete right maxilla, lingual view; D, OMNH 60245, incomplete right maxilla, labial view; E, UALVP 39977, incomplete right maxilla, labial view; F, OMNH 60239, anterior part of left maxilla, lingual view; G, H, UALVP 16239, anterior part of right maxilla, G, lingual view, H, dorsal view; I-N, A. galaktion; I-K, UALVP 16240, incomplete right maxilla, I, labial view, J, lingual view, K, dorsal view; L-N, UALVP 16241, incomplete right maxilla, L, labial view, M, lingual view, N, dorsal view. Provenances: A-C, E, G-N, UALVP specimens, Milk River Formation, lower Campanian (i.e. Aquilan in age), Alberta; D, OMNH 60245, Kaiparowits Formation, Utah; F, OMNH 60239, Aguja Formation, Texas, both middle Campanian (i.e. Judithian in age). Scale bars: 1 mm.

FIG. 2 in Albanerpetontid Amphibians from the Upper Cretaceous (Campanian and Maastrichtian) of North America

FIG. 2. — Dentaries of Albanerpeton nexuosus Estes, 1981 and A. galaktion Fox & Naylor, 1982, Campanian and Maastrichtian (Aquilan to Lancian in age), North American Western Interior; A-I, A. nexuosus; A, B, UCMP 49540, topotypic right mandible consisting of incomplete dentary and anterior tip of angular, A, lingual view, B, occlusal view; C, UCMP 49535, incomplete topotypic right dentary, lingual view; D, E, UCM 38714, incomplete left dentary, D, labial view, E, lingual view; F, RTMP 96.78.152, anterior part of left dentary, lingual view; G, UALVP 16238, anterior part of right dentary, labial view; H, UALVP 40014, anterior part of right dentary, labial view; I, UALVP 40032, posterior part of left dentary missing posteriormost end of area for attachment of postdentary bones, lingual view; J-M, A. galaktion; J, UALVP 16221, incomplete small, left dentary, lingual view; K-M, UALVP 16217, incomplete large, right dentary, K, labial view, L, lingual view, M, occlusal view. Provenances: A-C, UCMP specimens, Lance Formation, Wyoming; D, E, UCM specimen, Laramie Formation, Colorado, all upper Maastrichtian (i.e. Lancian in age); F, RTMP specimen, Oldman Formation, middle Campanian (i.e. Judithian in age), Alberta; G-M, UALVP specimens, Milk River Formation, lower Campanian (i.e. Aquilan in age), Alberta. Scale bars: 1 mm.

FIG. 8 in Albanerpetontid Amphibians from the Upper Cretaceous (Campanian and Maastrichtian) of North America

FIG. 8. — Frontals of Albanerpeton gracilis n. sp. and atlas of indeterminate albanerpetontid genus and species, Campanian (Judithian and Aquilan in age), Alberta; A-E, A. gracilis n. sp.; A, B, RTMP 86.194.8, fused and nearly complete frontals, A, dorsal view, B, ventral view; C, RTMP 96.78.135, fused and nearly complete frontals with medial end of right prefrontal (arrow) preserved in articulation, ventral view; D, E, RTMP 95.181.67, fused frontals missing anterior part, D, dorsal view, E, ventral view; F-H, genus and species indeterminate; F, G, UALVP 16234, nearly complete atlas missing part of left wall of neural arch, F, anterior view, G, posteri- or view; H, right lateral view, with arrows indicating foramen on right side for exit of first spinal nerve. Provenances: A, B, D, E, A. gracilis n. sp., Dinosaur Park, C, Oldman formations, middle Campanian (i.e. Judithian in age); F-H, genus and species indeterminate, Milk River Formation, lower Campanian (i.e. Aquilan in age). Scale bar: 1 mm.