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  3. Vol. 6 (2019): Geology of the Intermountain West

Vol. 6 (2019): Geology of the Intermountain West

Jurassic Morrison Formation as exposed at Cope’s Nipple lying between the orange Pennyslvanian Fountain Formation and overlying Cretaceous Lytle Formation capping the butte to the left. Photo courtesy of Dan Grenard (retired, Bureau of Land Management, Cañon City, Colorado).
DOI: https://doi.org/10.31711/giw.v6
Published: 2019-01-01

Articles

  • Jurassic Morrison Formation as exposed at Cope’s Nipple lying between the orange Pennyslvanian Fountain Formation and overlying Cretaceous Lytle Formation capping the butte to the left. Photo courtesy of Dan Grenard (retired, Bureau of Land Management, Cañon City, Colorado).
    Redefining the Upper Jurassic Morrison Formation in Garden Park National Natural Landmark and vicinity, eastern Colorado: Geology of the Intermountain West
    Kenneth Carpenter, Eugene Lindsey
    1-30
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  • Bones of Camarasaurus supremus as found and excavated by Oramel Lucas in 1877. Photograph was taken by C.W. Talbot (Cañon City, Colorado). See figure 4 caption for more details.
    History and geology of the Cope’s Nipple Quarries in Garden Park, Colorado—type locality of giant sauropods in the Upper Jurassic Morrison Formation
    Kenneth Carpenter
    31-53
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  • Two views of a cast of the long-lost holotype of Petalodus ohioensis Safford, 1853 and hypothetic restoration of the shark. The cast resolves the long historical debate about the validity of this ancient shark tooth species.
    Taxonomic validity of Petalodus ohioensis (Chondrichthyes, Petalodontidae) based on a cast of the lost holotype
    Kenneth Carpenter, Wayne M. Itano
    55-60
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  • West view of the Morrison Formation at Rainbow Draw. The fossil log horizon is in the greenish- colored siltstone beds near the center of the photograph. The Cretaceous Cedar Mountain through the Frontier Formations are exposed on the distant ridge. See figure 7 for details. Inset photo of a fossil log typically found in Rainbow Draw.
    Stratigraphic Setting of Fossil Log Sites in the Morrison Formation (Upper Jurassic) near Dinosaur National Monument, Uintah County, Utah, USA
    Douglas A. Sprinkel, Mary Beth Bennis, Dale E. Gray, Carole T. Gee
    61-76
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  • Fossil wood thin sections of Agathoxylon hoodii showing fine anatomical details. All micrographs were taken of radial sections of thin section RDW-004. Two photographs of the fossil logs found in Rainbow Draw, Uintah County, Utah.
    Silicified logs of Agathoxylon hoodii (Tidwell et Medlyn) comb. nov. from Rainbow Draw, near Dinosaur National Monument, Uintah County, Utah, USA, and their implications for araucariaceous conifer forests in the Upper Jurassic Morrison Formation
    Carole T. Gee, Douglas A. Sprinkel, Mary Beth Bennis, Dale E. Gray
    77-92
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  • Based on morphology alone, differing attributes (including body size, cranial, vertebral, and limb morphologies) between two specimens could result in the interpretation that they are distinct. Conversely, from just histology, only age is assessed from a growth perspective. However, by increasing the lines of evidence, by incorporating both morphology and histology, we can more accurately account for a growth series. Growth is gradational, so we should expect to see not just the extremes, but transitional forms as well. Human scale bar is Augustus Saint-Gaudens’ Diana of the Tower, depicting Diana as 1.83 m. Diplodocus sp. silhouettes originally based on art by S. Hartman available via PhyloPic (Creative Commons Attribution- ShareAlike 3.0 Unported).
    What factors influence our reconstructions of Morrison Formation sauropod diversity?
    D. Cary Woodruff
    93-112
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