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1,137 results for “Upper Cretaceous”
Fig. 51 in Scaphites Of The ''Nodosus Group'' From The Upper Cretaceous (Campanian) Of The Western Interior Of North America
Fig. 51. Hoploscaphites nodosus (Owen, 1852), macroconchs. A, B. USNM 536218, USGS Mesozoic loc. 22182, Bearpaw Shale, Baculites cuneatus–B. reesidei zones, Fergus County, Montana. A. Ventral; B. left lateral. C, D. USNM 315704, uncoated, said to be from the ''Yellowstone River, 150 mi above river mouth, Montana,'' but more probably from the Pierre Shale, Pennington County, South Dakota. C. Ventral; D. left lateral. Specimens are illustrated natural size.
Fig. 28 in Scaphites Of The ''Nodosus Group'' From The Upper Cretaceous (Campanian) Of The Western Interior Of North America
Fig. 28. Septal approximation at maturity in Hoploscaphites nodosus (Owen, 1852) and H. brevis (Meek, 1876). A, B. H. nodosus, macroconchs. A. YPM 35598, YPM loc. C3347, Pierre Shale, Belle Fourche River, South Dakota. Septal approximation occurs over one chamber and is relatively weak (the interseptal distance of the last chamber is 65% that of the last ''normal'' chamber). This specimen also exhibits a marked pathology due to an injury, which probably explains the large variation in septal
Fig. 41 in Scaphites Of The ''Nodosus Group'' From The Upper Cretaceous (Campanian) Of The Western Interior Of North America
Fig. 41. Size-frequency histogram of Hoploscaphites nodosus (Owen, 1852), Pierre Shale and Bearpaw Shale, Baculites compressus–B. cuneatus zones, based on the samples in tables 3 and 5, including additional unnumbered specimens in the BHI collections.
Fig. 58 in Scaphites Of The ''Nodosus Group'' From The Upper Cretaceous (Campanian) Of The Western Interior Of North America
Fig. 58. Scaphites from the Oacoma Member, Baculites compressus Zone, Pierre Shale, east-central South Dakota. A–C. Hoploscaphites brevis (Meek, 1876), macroconchs. A, B. USNM 536268, USGS Mesozoic loc. D13686, Buffalo County. A. Ventral; B. left lateral. C. USNM 536269, left lateral, USGS Mesozoic loc. D13583, Lyman County. D–F. Hoploscaphites nodosus (Owen, 1852), macroconchs. D.
Fig. 27 in Scaphites Of The ''Nodosus Group'' From The Upper Cretaceous (Campanian) Of The Western Interior Of North America
Fig. 27. Hoploscaphites brevis (Meek, 1876) from a single concretion (Concretion S), AMNH loc. 3274, Pierre Shale, Baculites compressus–B. cuneatus zones, Meade County, South Dakota (continuation of fig. 26), containing a mixture of macroconchs and microconchs. A–D. Small microconch, AMNH 58514. A. Right lateral; B. apertural; C. ventral; D. left lateral. E–F. Large, coarsely ornamented macroconch, AMNH 58516. Note the small scaphite in the aperture. E. Right lateral; F. apertural. Specimens are illustrated natural size.
Fig. 62 in Scaphites Of The ''Nodosus Group'' From The Upper Cretaceous (Campanian) Of The Western Interior Of North America
Fig. 62. Hoploscaphites nodosus (Owen, 1852), large microconch, BHI 4222, uncoated, Baculites compressus Zone, Pierre Shale, Meade County, South Dakota. A. Right lateral; B. apertural; C. ventral; D. left lateral. The shell on the phragmocone was removed to expose the sutures. Specimen is illustrated natural size.
Fig. 24. A in Scaphites Of The ''Nodosus Group'' From The Upper Cretaceous (Campanian) Of The Western Interior Of North America
Fig. 24. A. Plot of H4/H2 versus H4/H6 in Hoploscaphites nodosus (Owen, 1852). B. Plot of H4/H2 versus H4/H6 in H. brevis (Meek, 1876). In each species, the two dimorphs appear as distinct clusters with some overlap between them.
Fig. 26 in Scaphites Of The ''Nodosus Group'' From The Upper Cretaceous (Campanian) Of The Western Interior Of North America
Fig. 26. Hoploscaphites brevis (Meek, 1876) from a single concretion (Concretion S), AMNH loc. 3274, Pierre Shale, Baculites compressus–B. cuneatus zones, Meade County, South Dakota. A–C. Small microconch, AMNH 58518. A. Right lateral; B. apertural; C. left lateral. D, E. Small macroconch, AMNH 58517. D. Apertural; E. left lateral. F–I. Small macroconch, AMNH 58515. F. Right lateral; G. apertural; H. ventral; I. left lateral. Specimens are illustrated natural size.
Fig. 23. A in Scaphites Of The ''Nodosus Group'' From The Upper Cretaceous (Campanian) Of The Western Interior Of North America
Fig. 23. A. Plot of LMAX (mm) versus UDP (mm) in Hoploscaphites nodosus (Owen, 1852) reveals a cluster of microconchs on the upper left and a cluster of macroconchs on the lower right. B. Plot of UDP (mm) versus UDL (mm) in Hoploscaphites nodosus (Owen, 1852) distinguishes the two dimorphs mainly on the basis of UDP.
Fig. 21 in Scaphites Of The ''Nodosus Group'' From The Upper Cretaceous (Campanian) Of The Western Interior Of North America
Fig. 21. Sutures in Hoploscaphites nodosus (Owen, 1852) and H. brevis (Meek, 1876). A. Hoploscaphites brevis (Meek, 1876), macroconch, third from last suture, BHI 7034, Pierre Shale, Baculites cuneatus Zone, Pennington County, South Dakota. B. Hoploscaphites brevis (Meek, 1876), macroconch, next to last suture, BHI 4205, Baculites compressus Zone, Pierre Shale, Meade County, South Dakota. C. Hoploscaphites nodosus (Owen, 1852), microconch, fourth from last suture, USNM 536232, USGS Mesozoic loc. 21224, Bearpaw Shale, Big Horn County, Montana. D. Hoploscaphites nodosus (Owen,
Fig. 61 in Scaphites Of The ''Nodosus Group'' From The Upper Cretaceous (Campanian) Of The Western Interior Of North America
Fig. 61. Sutures of Hoploscaphites nodosus (Owen, 1852). A. YPM 35593, macroconch, next to last suture, YPM loc. C3346, Pierre Shale, locality unknown. B. BHI 4222, microconch, third from last suture, Baculites compressus Zone, Pierre Shale, Meade County, South Dakota. C. AMNH 56880, juvenile, last suture, WH 5 16.2 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. 19 in Scaphites Of The ''Nodosus Group'' From The Upper Cretaceous (Campanian) Of The Western Interior Of North America
Fig. 19. Spacing of ventrolateral tubercles on the adult shells of Hoploscaphites nodosus (Owen, 1852) and H. brevis (Meek, 1876). A. Hoploscaphites brevis (Meek, 1876), large macroconch, BHI 4790, Baculites compressus–B. cuneatus zones, Pierre Shale, Meade County, South Dakota. B. Hoploscaphites nodosus (Owen, 1852), large microconch, BHI 4222, Baculites compressus Zone, Pierre Shale, Meade County, South Dakota. C. Hoploscaphites nodosus (Owen, 1852), large macroconch, BHI 4216, Baculites
Fig. 16 in Scaphites Of The ''Nodosus Group'' From The Upper Cretaceous (Campanian) Of The Western Interior Of North America
Fig. 16. Embryonic whorls of Hoploscaphites brevis (Meek, 1876), AMNH loc. 3274, Baculites compressus–B. cuneatus zones, Pierre Shale, Meade County, South Dakota. A–C. Median cross section, AMNH 58522. A. The embryonic shell ends in the primary varix (PV). The ammonitella diameter is 742 Mm and the ammonitella angle is 281u. B. Close-up of the primary varix (PV). The arrow here and in C and D indicates the adoral direction. C. The postembryonic shell emerges from beneath the primary varix (PV) and consists of an outer prismatic (OP) and inner nacreous layer (NA). D–E. Median cross section, AMNH 58531. D. The proseptum (1), its necklike attachment (N), and the flange (F) are visible. E. Closeup of the dorsal portion of the proseptum (1), its necklike attachment (N), and the flange (F). F. Close-up of the ventral portion of the proseptum (1) and its necklike attachment (N).
Fig. 39. Fossil invertebrates from a in Scaphites Of The ''Nodosus Group'' From The Upper Cretaceous (Campanian) Of The Western Interior Of North America
Fig. 39. Fossil invertebrates from a cold seep in the Pierre Shale, Didymoceras cheyennense Zone, AMNH loc. 3418, Custer County, South Dakota. A, B. Baculites corrugatus Elias, 1933, mature macroconch, AMNH 58552, uncoated. Note the series of small scalloped edges along the entire length of the body chamber on both sides (arrows), probably reflecting predation. A. Ventral, with apertural projection on top; B. right lateral, with apertural projection on top. C. Didymoceras cheyennense (Meek
Fig. 14. Scaphite terminology. A in Scaphites Of The ''Nodosus Group'' From The Upper Cretaceous (Campanian) Of The Western Interior Of North America
Fig. 14. Scaphite terminology. A. Macroconch, right lateral view. The shell is oriented in the probable floating position when the body was withdrawn into the body chamber. The umbilical seam of the shaft in
Fig. 11. Fossiliferous concretion BHI 4788 in Scaphites Of The ''Nodosus Group'' From The Upper Cretaceous (Campanian) Of The Western Interior Of North America
Fig. 11. Fossiliferous concretion BHI 4788 from the Baculites cuneatus Zone of the Pierre Shale, Meade County, South Dakota. The concretion contains an adult specimen of B. cuneatus Cobban, 1962, an adult macroconch of Hoploscaphites brevis (Meek, 1876), and ''Inoceramus'' sagensis Owen, 1852.
Fig. 10. B in Scaphites Of The ''Nodosus Group'' From The Upper Cretaceous (Campanian) Of The Western Interior Of North America
Fig. 10. B. Comparison of the biostratigraphy of the upper part of the Campanian in the Western Interior of North America area indicates the biostratigraphic interval corresponding to the ranges of Hoploscaphites nodosus and H. brevis. The
Fig. 10. A in Scaphites Of The ''Nodosus Group'' From The Upper Cretaceous (Campanian) Of The Western Interior Of North America
Fig. 10. A. Acanthoscaphites praequadrispinosus Błaszkiewicz, 1980 (38: pl. 19, figs. 6–8), holotype, IG 1.310.II.17, macroconch, left lateral, Nostoceras (N.) hyatti Zone, Piotrawin, Vistula River Valley, Poland. Forms similar or identical to this species occur in the Baculites reesidei-B. jenseni zones of the Western Interior of North America. The specimen is illustrated natural size.
Fig. 49 in Scaphites Of The ''Nodosus Group'' From The Upper Cretaceous (Campanian) Of The Western Interior Of North America
Fig. 49. Hoploscaphites nodosus (Owen, 1852), macroconchs. A, B. AMNH 58513, locality unknown, probably Pennington County, South Dakota. A. Ventral; B. left lateral. C, D. BHI 4215, Baculites cuneatus Zone, Meade County, South Dakota. C. Right lateral; D. ventral hook. Specimens are illustrated natural size.
Fig. 48 in Scaphites Of The ''Nodosus Group'' From The Upper Cretaceous (Campanian) Of The Western Interior Of North America
Fig. 48. Hoploscaphites nodosus (Owen, 1852), large macroconch, AMNH 47121, Baculites cuneatus–B reesidei zones, Bearpaw Shale, AMNH loc.
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