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1,137 results for “Upper Cretaceous”
Fig. 89 in Scaphites Of The ''Nodosus Group'' From The Upper Cretaceous (Campanian) Of The Western Interior Of North America
Fig. 89. Hoploscaphites brevis (Meek, 1876), large macroconchs. A–C. BHI 4124, Baculites compressus– B. cuneatus zones, Pierre Shale, Meade County, South Dakota. A. Right lateral; B. apertural; C. ventral. D–F. BHI 4202, Baculites compressus Zone, Pierre Shale, Meade County, South Dakota. D. Apertural; E. ventral; F. left lateral. Specimens are illustrated natural size.
Fig. 88 in Scaphites Of The ''Nodosus Group'' From The Upper Cretaceous (Campanian) Of The Western Interior Of North America
Fig. 88. Hoploscaphites brevis (Meek, 1876), YPM loc. A6520, Pierre Shale, Sage Creek, Pennington County, South Dakota. A. YPM 355812, 35582, macroconch and microconch, respectively, in the same concretion. B–D. YPM 35576, large macroconch. B. Apertural; C. ventral; D. left lateral. Specimens are illustrated natural size.
Fig. 87 in Scaphites Of The ''Nodosus Group'' From The Upper Cretaceous (Campanian) Of The Western Interior Of North America
Fig. 87. Hoploscaphites brevis (Meek, 1876), large macroconchs. A–C. BHI 4203, Baculites compressus Zone, Pierre Shale, Meade County, South Dakota. A. Apertural; B. ventral; C. left lateral. D, E. USNM 536222, USGS Mesozoic loc. 23537, Didymoceras cheyennense Zone, Pierre Shale, Carter County, Montana. A chunk of shell is missing from the back of the body chamber. D. Right lateral, E. apertural. Specimens are illustrated natural size.
Fig. 86. A–D in Scaphites Of The ''Nodosus Group'' From The Upper Cretaceous (Campanian) Of The Western Interior Of North America
Fig. 86. A–D. Hoploscaphites brevis (Meek, 1876), macroconch, USNM 12289 (5 Whitfield, 1880: pl. 13, figs. 8, 9, Scaphites nodosus var. brevis), uncoated, from ''the Fort Pierre Group, Cheyenne River, near Rapid Creek, Black Hills, Dakota.'' A. Right lateral; B. apertural; C. ventral; D. left lateral. E–G. Hoploscaphites plenus (Meek, 1876), macroconch, GSC 21852 (5 Riccardi, 1983: pl. 5, figs. 5–7, Hoploscaphites cf. brevis [Meek, 1876]), GSC loc. 97993, Bearpaw Shale, Frenchman (?) River, Saskatchewan, Canada. E. Apertural; F. ventral; G. left lateral. Specimens are illustrated natural size.
Fig. 85 in Scaphites Of The ''Nodosus Group'' From The Upper Cretaceous (Campanian) Of The Western Interior Of North America
Fig. 85. Hoploscaphites brevis (Meek, 1876), large macroconchs. A–C. USNM 536223, USGS Mesozoic loc. D1074, Baculites reesidei Zone (?), Pierre Shale, Pueblo County, Colorado. A. Right lateral; B. apertural; C. ventral. D–F. USNM 536225, USGS Mesozoic loc. 7892, Bearpaw Shale, Musselshell County, Montana. D. Right lateral; E. apertural; F. ventral. Specimens are illustrated natural size.
Fig. 100 in Scaphites Of The ''Nodosus Group'' From The Upper Cretaceous (Campanian) Of The Western Interior Of North America
Fig. 100. Sutures of Hoploscaphites brevis (Meek, 1876). A. BHI 4202, macroconch, third to last suture, Baculites compressus Zone, Pierre Shale, Meade County, South Dakota. B. BHI 4235, macroconch, next to last suture, Baculites compressus Zone, Pierre Shale, Meade County, South Dakota. C. USNM 536225, microconch, last suture, WH 5 27.2 mm, USGS Mesozoic loc. 7892, Bearpaw Shale, Musselshell County, Montana. D. BHI 4314, microconch, third from last suture, Baculites compressus–B. cuneatus zones, Pierre Shale, Meade County, South Dakota. E. BHI 4261, microconch, next to last suture, Baculites compressus Zone, Pierre Shale, Meade County, South Dakota. F. AMNH 56881, juvenile, last suture, WH 5 6.2 mm, AMNH loc. 3274, Baculites compressus–B. cuneatus zones, Pierre Shale, Meade County, South Dakota. Abbreviations: x 5 tubercle; E 5 ventral lobe; E/L 5 first lateral saddle between ventral and lateral lobes; L 5 lateral lobe.
Fig. 84 in Scaphites Of The ''Nodosus Group'' From The Upper Cretaceous (Campanian) Of The Western Interior Of North America
Fig. 84. Spacing of ventrolateral tubercles on the adult shell of Hoploscaphites brevis (Meek, 1876), macroconchs. A. BHI 4203, Baculites compressus Zone, Pierre Shale, Meade County, South Dakota. B. USNM 367, holotype, Pierre Shale, probably from the Sage Creek area, Pennington County, South Dakota. C. BHI 4235, Baculites compressus Zone, Pierre Shale, Meade County, South Dakota. D. YPM 35585, YPM loc. A6520, Pierre Shale, Sage Creek, Pennington County, South Dakota. E. BHI 4796, Baculites compressus–B. cuneatus zones, Pierre Shale, Meade County, South Dakota. The photo in E has been flipped so that it faces the same way as the others. Symbols: N 5 tubercle on the phragmocone; o 5 tubercle on the body chamber.
Fig. 105 in Scaphites Of The ''Nodosus Group'' From The Upper Cretaceous (Campanian) Of The Western Interior Of North America
Fig. 105. Hoploscaphites brevis (Meek, 1876), small microconchs. A–C. BHI 4283, Baculites cuneatus Zone, Pierre Shale, Meade County, South Dakota. A. Right lateral; B. apertural; C. ventral. D–F. USNM 536243, locality unknown, but probably Pierre Shale, Pennington County, South Dakota. D. Right lateral; E. apertural; F. ventral. G–I. BHI 4211a, Baculites compressus Zone, Pierre Shale, Meade County, South Dakota. G. Right lateral; H. apertural; I. ventral. Specimens are illustrated natural size.
Fig. 81. Hoploscaphites aff. H in Scaphites Of The ''Nodosus Group'' From The Upper Cretaceous (Campanian) Of The Western Interior Of North America
Fig. 81. Hoploscaphites aff. H. nodosus (Owen, 1852), Coon Creek Tongue, Ripley Formation, Nostoceras (N.) hyatti Zone, Coon Creek, McNairy County, Tennessee. A, B. MPPM 1996.39.1, macroconch. A. Ventral; B. left lateral. C, D. MPPM 1996.39.3, macroconch. C. Right ventrolateral; D. ventral. These specimens are more coarsely ribbed than Hoploscaphites nodosus (Owen, 1852). Specimens are illustrated natural size.
Fig. 82 in Scaphites Of The ''Nodosus Group'' From The Upper Cretaceous (Campanian) Of The Western Interior Of North America
Fig. 82. Size-frequency histogram of Hoploscaphites brevis (Meek, 1876), Pierre Shale and Bearpaw Shale, Baculites compressus–B. cuneatus zones, based on the samples in tables 7 and 9.
Fig. 77 in Scaphites Of The ''Nodosus Group'' From The Upper Cretaceous (Campanian) Of The Western Interior Of North America
Fig. 77. Septal approximation at maturity in Hoploscaphites nodosus (Owen, 1852). A, B. Macroconchs. A. BHI 4948, Baculites compressus Zone, Pierre Shale, Meade County, South Dakota. Septal approximation occurs over two chambers and is strong (the interseptal distance of the last chamber is 36% that of the last ''normal'' chamber). B. AMNH 58511, Pierre Shale, Meade County, South Dakota. Septal approximation occurs over one chamber and is modest (the interseptal distance of the last chamber is 53% that of the last ''normal'' chamber). C–F. Microconchs. C. BHI 4222, Baculites compressus Zone,
Fig. 114 in Scaphites Of The ''Nodosus Group'' From The Upper Cretaceous (Campanian) Of The Western Interior Of North America
Fig. 114. Plot of the ratio of umbilical diameter to shell diameter (UD/D) versus shell diameter (mm) in Hoploscaphites brevis (Meek, 1876) in early (top graph) and later ontogeny (bottom graph; see figs. 110– 112 for illustrations of cross sections on which these graphs are based, and appendix 2, tables 4–6, for a list of measurements). The ratio decreases through most of ontogeny until a shell diameter of approximately 10 mm, after which it remains nearly the same until the formation of the mature body chamber. Filled symbols indicate measurements in the mature body chamber.
Fig. 75 in Scaphites Of The ''Nodosus Group'' From The Upper Cretaceous (Campanian) Of The Western Interior Of North America
Fig. 75. Plot of the ratio of umbilical diameter (UD/D) to shell diameter versus shell diameter (mm) in Hoploscaphites nodosus (Owen, 1852) in early (top graph) and later ontogeny (bottom graph; see figs. 72, 73 for illustrations of cross sections on which these graphs are based, and appendix 2, tables 1–3, for a list of measurements). The ratio decreases through most of ontogeny until a shell diameter of approximately 20 mm, after which it remains nearly the same until the beginning of the mature body chamber. Filled symbols indicate measurements in the mature body chamber.
Fig. 109 in Scaphites Of The ''Nodosus Group'' From The Upper Cretaceous (Campanian) Of The Western Interior Of North America
Fig. 109. Hoploscaphites brevis (Meek, 1876), small microconchs. A–D. BHI 4252, Baculites cuneatus Zone, Pierre Shale, Meade County, South Dakota. A. Right lateral; B. apertural; C. ventral; D. left lateral. E–H. YPM 35586, YPM A6520, Pierre Shale, Sage Creek, Pennington County, South Dakota. E. Right lateral; F. apertural; G. ventral; H. left lateral. I–L. BHI 4249, Baculites compressus–B. cuneatus zones, Pierre Shale, Meade County, South Dakota. I. Right lateral; J. apertural; K. ventral; L. left lateral. M–P. USNM 536250, locality unknown, but probably Pierre Shale, Pennington County, South Dakota. M. Right lateral; N. apertural; O. ventral; P. left lateral. Specimens are illustrated natural size.
Fig. 99 in Scaphites Of The ''Nodosus Group'' From The Upper Cretaceous (Campanian) Of The Western Interior Of North America
Fig. 99. Hoploscaphites brevis (Meek, 1876), small macroconchs. A–D. YPM 35585, YPM loc. A6520, Pierre Shale, Sage Creek, Pennington County, South Dakota. A. Right lateral; B. apertural; C. ventral; D. left lateral. E–H. BHI 4250, Baculites compressus–B. cuneatus zones, Pierre Shale, Meade County, South Dakota. E. Right lateral; F. apertural; G. ventral; H. left lateral. I–L. BHI 4311, Baculites compressus–B.
Fig. 116 in Scaphites Of The ''Nodosus Group'' From The Upper Cretaceous (Campanian) Of The Western Interior Of North America
Fig. 116. Septal approximation at maturity in Hoploscaphites brevis (Meek, 1876). A–C. Macroconchs. A. BHI 7034, Baculites cuneatus Zone, Pierre Shale, Pennington County, South Dakota. Septal approximation occurs over three chambers and is strong (the interseptal distance of the last chamber is
Fig. 74 in Scaphites Of The ''Nodosus Group'' From The Upper Cretaceous (Campanian) Of The Western Interior Of North America
Fig. 74. Plot of the ratio of whorl width to height (W/H) versus shell diameter (mm) in Hoploscaphites nodosus (Owen, 1852) in early (top graph) and later ontogeny (bottom graph; see figs. 72, 73 for illustrations of cross sections on which these graphs are based, and appendix 2, tables 1–3, for a list of measurements). The ratio of whorl width to height decreases through most of ontogeny until the beginning of the mature phragmocone, after which it increases. Filled symbols indicate measurements in the mature body chamber.
Fig. 104 in Scaphites Of The ''Nodosus Group'' From The Upper Cretaceous (Campanian) Of The Western Interior Of North America
Fig. 104. Hoploscaphites brevis (Meek, 1876), large microconchs, locality unknown, but probably Pierre Shale, Pennington County, South Dakota. A–C. USNM 536242. A. Apertural; B. ventral; C. left lateral. D–F. USNM 536241. D. Apertural; E. ventral; F. left lateral. Specimens are illustrated natural size.
Fig. 73. Dorsoventral cross section through a in Scaphites Of The ''Nodosus Group'' From The Upper Cretaceous (Campanian) Of The Western Interior Of North America
Fig. 73. Dorsoventral cross section through a robust microconch of Hoploscaphites nodosus (Owen, 1852), USNM 536246, USGS Mesozoic loc. 9133, Pierre Shale, near Kremmling, Grand County, Colorado. The plane of the cross section approximately coincides with the line of maximum length. A. Camera lucida of cross section of the adult shell. The stippled area demarcates the mature body chamber. B. Camera lucida of cross section of the inner whorls. C. Photo of cross section of the inner whorls. Measurements are listed in appendix 2, table 3.
Fig. 71 in Scaphites Of The ''Nodosus Group'' From The Upper Cretaceous (Campanian) Of The Western Interior Of North America
Fig. 71. Hoploscaphites nodosus (Owen, 1852), microconchs, Baculites cuneatus Zone, Pierre Shale, near the junction of the Belle Fourche and Cheyenne Rivers, Meade County, South Dakota. A–C. BHI 4791. A. Right lateral; B. apertural; C. ventral. D, E. BHI 4794, massive body chamber. D. Right lateral; E. ventral. Specimens are illustrated natural size.
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