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459 results for “Campanian”
Fig. 102 in Scaphites Of The ''Nodosus Group'' From The Upper Cretaceous (Campanian) Of The Western Interior Of North America
Fig. 102. Hoploscaphites brevis (Meek, 1876), large microconchs, AMNH loc. 3274, Baculites compressus–B. cuneatus zones, Pierre Shale, Meade County, South Dakota. A–C. AMNH 58556. A. Right lateral; B. apertural; C. ventral. D–F. AMNH 56768. D. Right lateral; E. apertural; F. ventral. Specimens are illustrated natural size.
Fig. 103 in Scaphites Of The ''Nodosus Group'' From The Upper Cretaceous (Campanian) Of The Western Interior Of North America
Fig. 103. Hoploscaphites brevis (Meek, 1876), large microconchs. A–C. AMNH 55884, AMNH loc. 3415, Baculites compressus Zone, Pierre Shale, Meade County, South Dakota. A. Apertural; B. ventral; C. left lateral. D–F. BHI 4123, Baculites compressus–B. cuneatus zones, Pierre Shale, Meade County, South Dakota. D. Apertural; E. ventral; F. left lateral. Specimens are illustrated natural size.
Fig. 110. Dorsoventral cross section through a in Scaphites Of The ''Nodosus Group'' From The Upper Cretaceous (Campanian) Of The Western Interior Of North America
Fig. 110. Dorsoventral cross section through a small microconch of Hoploscaphites brevis (Meek, 1876), transitional in morphology to macroconch, USNM 536254, USGS Mesozoic loc. D12203, Baculites compressus Zone, Pierre Shale, Pennington County, South Dakota. 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 5.
Fig. 76 in Scaphites Of The ''Nodosus Group'' From The Upper Cretaceous (Campanian) Of The Western Interior Of North America
Fig. 76. Ontogenetic breakdown of Hoploscaphites nodosus (Owen, 1852), macroconch, USNM 536231, USGS Mesozoic loc. D12201,?Didymoceras cheyennense Zone, Bearpaw Shale, Big Horn County, Montana. A–F. Six sizes through ontogeny in lateral and ventral views showing the change in ornamentation from early ontogeny (F) to maturity (A). Note that A is reduced and all the other photos are either natural size or enlarged.
Fig. 108 in Scaphites Of The ''Nodosus Group'' From The Upper Cretaceous (Campanian) Of The Western Interior Of North America
Fig. 108. Hoploscaphites brevis (Meek, 1876), small microconchs. A–D. BHI 4239, transitional in morphology to macroconch, Baculites compressus Zone, Pierre Shale, Meade County, South Dakota. A. Right lateral; B. apertural; C. ventral; D. left lateral. E–H. BHI 4233, Baculites compressus Zone, Pierre Shale, Meade County, South Dakota. E. Right lateral; F. apertural; G. ventral; H. left lateral. I–L. AMNH 55874, transitional in morphology to macroconch, AMNH loc. 3415, Baculites compressus Zone, Pierre Shale, Meade County, South Dakota. I. Right lateral; J. apertural; K. ventral; L. left lateral. M–P. BHI 4240, transitional in morphology to macroconch, Baculites compressus–B. cuneatus zones, Pierre Shale, Meade County, South Dakota. M. Right lateral; N. apertural; O. ventral; P. left lateral. Specimens are illustrated natural size.
Fig. 69 in Scaphites Of The ''Nodosus Group'' From The Upper Cretaceous (Campanian) Of The Western Interior Of North America
Fig. 69. Hoploscaphites nodosus (Owen, 1852), microconchs. A, B. YPM 1868, YPM loc. A6520, Pierre Shale, Sage Creek, Pennington County, South Dakota. A. Right lateral; B. ventral. C, D. USNM 536245, USGS Mesozoic loc. D 221, Didymoceras cheyennense Zone, Pierre Shale, Dawes County, Nebraska. C. Right lateral; D. ventral. Specimens are illustrated natural size.
Fig. 68 in Scaphites Of The ''Nodosus Group'' From The Upper Cretaceous (Campanian) Of The Western Interior Of North America
Fig. 68. Hoploscaphites nodosus (Owen, 1852), microconchs. A, B. USNM 536229, USGS Mesozoic loc. D1785, Baculites cuneatus Zone, Pierre Shale, Grand County, Colorado. A. Right lateral; B. ventral. C, D. USNM 536227, USGS Mesozoic loc. D1353, Baculites cuneatus Zone, Pierre Shale, Grand County, Colorado. C. Ventral; D. left lateral. Specimens are illustrated natural size.
Fig. 46 in Scaphites Of The ''Nodosus Group'' From The Upper Cretaceous (Campanian) Of The Western Interior Of North America
Fig. 46. Hoploscaphites nodosus (Owen, 1852), macroconchs, Baculites compressus–B. cuneatus zones, Pierre Shale, South Dakota. A, B. BHI 4178, with a spiral furrow (arrow) extending from midshaft to the aperture on the left side of the shell. A. Ventral hook; B. left lateral. C, D. BHI 4121. C. Ventral; D. left lateral. Specimens are illustrated natural size.
Fig. 34 in Scaphites Of The ''Nodosus Group'' From The Upper Cretaceous (Campanian) Of The Western Interior Of North America
Fig. 34. Sublethal injuries in Hoploscaphites nodosus (Owen, 1852) and H. brevis (Meek, 1876), Baculites compressus–B. cuneatus zones, Pierre Shale, Meade County, South Dakota. A, B. Hoploscaphites
Fig. 56 in Scaphites Of The ''Nodosus Group'' From The Upper Cretaceous (Campanian) Of The Western Interior Of North America
Fig. 56. Hoploscaphites nodosus (Owen, 1852), macroconchs, Pierre Shale. A–C. USNM 536235, USGS Mesozoic loc. 9154, Pierre Shale, near Kremmling, Grand County, Colorado. A piece of shell is missing from the venter of the midshaft. A. Apertural; B. ventral; C. left lateral. D–F. USNM 536234, smaller and more compressed than holotype, USGS Mesozoic loc. D5034, Baculites compressus Zone, Round Butte, Larimer County, Colorado. A large chunk of shell is missing from the adapical part of the body chamber. D. Right lateral; E. apertural; F. ventral. Specimens are illustrated natural size.
Fig. 57 in Scaphites Of The ''Nodosus Group'' From The Upper Cretaceous (Campanian) Of The Western Interior Of North America
Fig. 57. Hoploscaphites nodosus (Owen, 1852), macroconch, USNM 536270, locality unknown. A. Right lateral; B. apertural; C. ventral; D. left lateral. This is the smallest macroconch known of this species and closely resembles Hoploscaphites compressus (Roemer, 1841). Specimen is illustrated natural size.
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.
Fig. 15 in Scaphites Of The ''Nodosus Group'' From The Upper Cretaceous (Campanian) Of The Western Interior Of North America
Fig. 15. Embryonic whorls of Hoploscaphites nodosus (Owen, 1852) and H. brevis (Meek, 1876), AMNH loc. 3274, Baculites compressus–B. cuneatus zones, Pierre Shale, Meade County, South Dakota. A– C. Hoploscaphites brevis (Meek, 1876), AMNH 58539. A. The embryonic shell is covered with tubercles. B. Most of the tubercles are irregularly distributed but some are aligned in longitudinal rows. C. The tubercles vary in diameter and range from 5–10 Mm. D–F. Hoploscaphites nodosus (Owen, 1852), AMNH 66259. D. Ventral surface of the embryonic shell just adapical of the primary constriction. The surface is covered with a thin dorsal layer and retains the outline of the dorsal sutures of the succeeding whorl. E. Muscle scar in the dorsal lobe. F. The muscle scar is demarcated by a fine-grained texture.
Fig. 4. Representative batoid chondrichthyan teeth from the J&M in New Late Cretaceous microvertebrate assemblage from the Campanian-Maastrichtian Williams Fork Formation, northwestern Colorado, USA, and its paleoenvironmental implications
Fig. 4. Representative batoid chondrichthyan teeth from the J&M site, Colorado, USA, Williams Fork Formation, Upper Cretaceous. A, B. Myledaphus bipartitus Cope, 1876. A. MWC 8887, tooth crown and root in mesial (A1), labial (A2), and occlusal (A3) views. B. MWC 9591, tooth crown and root in mesial (B1), labial (B2), and occlusal (B3) views. C, D. Pseudomyledaphus sp. C. MWC 9589, tooth crown and root in mesial (C1) and occlusal (C2) views. D. MWC 9590, tooth crown and root in mesial (D1) and occlusal (D2) views. E, F. Cristomylus sp. E. MWC 8886, tooth crown in mesial (E1) and occlusal (E2) views. F. MWC 9588, tooth crown in mesial (F1) and occlusal (F2) views.
Fig. 2 in New Late Cretaceous microvertebrate assemblage from the Campanian-Maastrichtian Williams Fork Formation, northwestern Colorado, USA, and its paleoenvironmental implications
Fig. 2. Stratigraphy of the J&M site within the Williams Fork Formation. A. Regional Upper Cretaceous stratigraphy. B. Generalized stratigraphic section of the Williams Fork Formation west of Rangely (after Noll 1988). C. Stratigraphic section of Williams Fork Formation strata exposed at the J&M site, showing the stratigraphic position of the locality in Noll's (1988) "sandstone C". Width of stratigraphic units mimics the local weathering profile. Shading on unit 3B indicates a darker color than mudstones A and C. A detailed description of the J&M site stratigraphy is provided in the SOM: table S1 (Supplementary Online Material available at http://app.pan.pl/SOM/app67-Brand_etal_SOM.pdf).
FIGURE 34 in Ammonoids and their biozonation across the Santonian-Campanian boundary in north-eastern Coahuila, Mexico
FIGURE 34. Menuites stephensoni sp. from the Tepeyac section. A–D: CPC–2196 from bed TPY69-89. Scale: 50
FIGURE 29 in Ammonoids and their biozonation across the Santonian-Campanian boundary in north-eastern Coahuila, Mexico
FIGURE 29. Pachydiscus (Pachydiscus) duelmensis (Schlüter, 1972) from bed TPY50. A–B: CPC–2545. Scale: 50 mm.
FIGURE 20 in Ammonoids and their biozonation across the Santonian-Campanian boundary in north-eastern Coahuila, Mexico
FIGURE 20. Menabites (Bererella) walnutensis (Young, 1963) from bed TPY74. A–B: CPC–2404. C–F: CPC– 2406. Scale: 50 mm.
FIGURE 41 in Ammonoids and their biozonation across the Santonian-Campanian boundary in north-eastern Coahuila, Mexico
FIGURE 41. The early Campanian World with localities presenting ammonites with affinities to northeastern Coahuila (e.g., Tepeyac). Endemic species are summarized in the asterisk. Species with a wider occurrence are marked in other regions, but not in the northwestern Gulf region. Map courtesy of Scotese (2021).
FIGURE 16 in Ammonoids and their biozonation across the Santonian-Campanian boundary in north-eastern Coahuila, Mexico
FIGURE 16. Menabites (Delawarella) vanuxemi (Morton, 1830) from the middle Tepeyac section. A–D: CPC–2379, TPY33. E: CPC–2390, TPY50. F: CPC–2391, TPY50. Scale: 50 mm.
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