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1,817 results for “Late Cretaceous”
Fig. 39 in Late Campanian (Cretaceous) Heteromorph Ammonites From The Western Interior Of The United States
Fig. 39. Scatter diagram showing ratios of whorl breadth to whorl height of Exiteloceras jenneyi jenneyi (Whitfield, 1877), based on nine specimens from USGS Mesozoic locality D9651 (●), nine specimens from USGS Mesozoic locality D13451 (×), and the holotype (Δ) and of E. jenneyi camacki, n. subsp., based on 11 specimens from USGS Mesozoic localities D454, D851, D1232, D2619, D13448, and D13510 (O) and the holotype (+).
Fig. 40 in Late Campanian (Cretaceous) Heteromorph Ammonites From The Western Interior Of The United States
Fig. 40. Suture of Exiteloceras jenneyi jenneyi (Whitfield, 1877). E is the external lobe, L is the lateral lobe, U is the umbilical lobe, and I is the internal lobe. The heavy, straight line marks the middle of the venter. USNM 482478, USGS Mesozoic locality D1947 (fig. 2, loc. 19).
Fig. 36 in Late Campanian (Cretaceous) Heteromorph Ammonites From The Western Interior Of The United States
Fig. 36. Didymoceras cheyennense (Meek and Hayden, 1856a). A. USNM 482467, USGS Mesozoic locality D221 (fig. 2, loc. 14). B. USNM
Fig. 55 in Late Campanian (Cretaceous) Heteromorph Ammonites From The Western Interior Of The United States
Fig. 55. Suture of a paratype (A) and side view (natural size) of the holotype (B) of Ptychoceras meekanum Whitfield, 1877 (from Whitfield, 1880: pl. 16, figs. 1, 2).
Fig. 58 in Late Campanian (Cretaceous) Heteromorph Ammonites From The Western Interior Of The United States
Fig. 58. Restoration of most of a Solenoceras bearpawense, n. sp. Stipple board drawing by John R. Stacy. Figure is ×3.
Fig. 43. A–C in Late Campanian (Cretaceous) Heteromorph Ammonites From The Western Interior Of The United States
Fig. 43. A–C. Exiteloceras jenneyi jenneyi (Whitfield, 1877). USNM 450341, from USGS Mesozoic locality D2854 (fig. 2, loc. 36). Figures are ×1.
Fig. 37. A, B in Late Campanian (Cretaceous) Heteromorph Ammonites From The Western Interior Of The United States
Fig. 37. A, B. Didymoceras cheyennense (Meek and Hayden, 1856a). BHMNH 2139, collected by Neal Larson, Pierre Shale near Red Shirt, Shannon County, S. Dak. Figures are reduced ×0.83.
Fig. 35 in Late Campanian (Cretaceous) Heteromorph Ammonites From The Western Interior Of The United States
Fig. 35. Didymoceras cheyennense (Meek and Hayden, 1856a). A. USNM 482465, USGS Mesozoic locality D1794 (fig. 2, loc. 37). B, C. USNM 482466, USGS Mesozoic locality D1689 (fig. 2, loc. 51). D. USNM 482460a, USGS Mesozoic locality D2740 (fig. 2, loc. 39). Figures are ×1.
Fig. 33 in Late Campanian (Cretaceous) Heteromorph Ammonites From The Western Interior Of The United States
Fig. 33. Didymoceras cheyennense (Meek and Hayden, 1856a). A. USNM 482463, USGS Mesozoic locality D1794 (fig. 2, loc. 37). B, C. USNM 482464, USGS Mesozoic locality D2740 (fig. 2, loc. 39). D, E. USNM 482458, USGS Mesozoic locality D804 (fig. 2, loc. 45). All figures are ×1.
Fig. 34. A–C in Late Campanian (Cretaceous) Heteromorph Ammonites From The Western Interior Of The United States
Fig. 34. A–C. Didymoceras cheyennense (Meek and Hayden, 1856a). BHMNH 2100, collected by Neal L. Larson, Pierre Shale near Red Shirt, Shannon County, S. Dak. Figures are reduced ×0.88.
Fig. 32 in Late Campanian (Cretaceous) Heteromorph Ammonites From The Western Interior Of The United States
Fig. 32. Index map of part of the Western Interior of the United States showing localities of Didymoceras cheyennense (Meek and Hayden, 1856a). 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. cheyennense zone time.
Fig. 54 in Late Campanian (Cretaceous) Heteromorph Ammonites From The Western Interior Of The United States
Fig. 54. Oxybeloceras crassum (Whitfield, 1877). A. USNM 482496, USGS Mesozoic locality D1387 (fig. 2, loc. 27). B. USNM 482497, USGS Mesozoic locality D1364 (fig. 2, loc. 16). C, D. USNM 482498, USGS Mesozoic locality D454 (fig. 2, loc. 17). E. USNM 482499, USGS Mesozoic locality D2842 (fig. 2, loc. 38). F. USNM 482500, USGS Mesozoic locality D2630 (fig. 2, loc. 4). G,
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).
Fig. 46 in Late Campanian (Cretaceous) Heteromorph Ammonites From The Western Interior Of The United States
Fig. 46. Exiteloceras jenneyi jenneyi (Whitfield, 1877). A, B. USNM 482486, USGS Mesozoic locality 1338 (fig. 2, loc. 59). C E. USNM 450342, USGS Mesozoic locality D79 (fig. 2, loc. 52). Figures are ×1.
Fig. 29 in Late Campanian (Cretaceous) Heteromorph Ammonites From The Western Interior Of The United States
Fig. 29. End (A), dorsal (B), and ventral (C) views of the holotype of Helicoceras angulatum Meek and Hayden, 1860b (from Meek, 1876: pl. 21, fig. 3a–c). Figures are ×1.
Fig. 64 in Late Campanian (Cretaceous) Heteromorph Ammonites From The Western Interior Of The United States
Fig. 64. Part of the suture of a paratype of Solenoceras larimerense, n. sp. E is the external lobe and L is the lateral lobe. The heavy, straight line marks the middle of the venter. USNM 482523, USGS Mesozoic locality D304 (fig. 2, loc. 35).
Fig. 62 in Late Campanian (Cretaceous) Heteromorph Ammonites From The Western Interior Of The United States
Fig. 62. Didymoceras nebrascense (Meek and Hayden, 1856a) and Solenoceras bearpawense, n. sp. BHMNH 4040, collected by Neal L. Larson, Pierre Shale in the SE1/4 sec. 12, T. 7 S., R. 7 E., Fall River County, S. Dak. Figure is reduced ×0.90.
Fig. 28 in Late Campanian (Cretaceous) Heteromorph Ammonites From The Western Interior Of The United States
Fig. 28. Side view and cross section of the holotype of Ancyloceras (Hamites) uncus Meek and Hayden, 1858 (from Meek, 1876: pl. 21, fig. 1a, b). Figure is ×1.
Fig. 49. Exiteloceras jenneyi camacki, n in Late Campanian (Cretaceous) Heteromorph Ammonites From The Western Interior Of The United States
Fig. 49. Exiteloceras jenneyi camacki, n. subsp. Side view and two cross sections of the holotype, USNM 482491, locality D1232 (fig. 2, loc. 53). The solid line is the costal section, and the dashed line is the intercostal section. Figure is ×1.
Fig. 48 in Late Campanian (Cretaceous) Heteromorph Ammonites From The Western Interior Of The United States
Fig. 48. Exiteloceras jenneyi jenneyi (Whitfield, 1877). BHMNH 2140, collected by Howard Ehrle, Pierre Shale in Carter County, Mont. Figure is reduced ×0.92.
ScienceDex guides
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Allen Brain Atlas
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International Brain Laboratory public data
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OpenNeuro
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