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Current Issue

Vol. 9 (2022): Geology of the Intermountain West
Published: 2022-02-03

Articles

  • View south from Forshea Mountain showing Phonolite Hill. Phonolite Hill, a rhyolite dome, erupted 5 million years ago at the bottom of Kingston Canyon. The photographer is standing on the 8 Ma rhyolite of Forshea Mountain. The top of the gently east-dipping canyon wall across the canyon would have been a valley floor 8 million years ago. The Sevier fault is to the right of the hills at the far right of the view, west of which is a glimpse of Sevier Valley. The base of the 5 Ma rhyolite dome of Phonolite Hill is at the current canyon floor, showing here a minimum of 4000 feet (1200 m) of uplift (it would show as more if the south wall were projected out to the Sevier fault) on the Sevier fault between 8 and 5 Ma.
    Basin-range uplift and canyon cutting in 3 million years, Kingston Canyon, Piute County, southwestern Utah
    Peter D. Rowley, Robert F. Biek, David B. Hacker
    1-11
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  • View south of unconformity on Hoodle Creek. The vertical light-colored beds of the Brian Head strata are truncated under gently east-dipping, well-bedded brownish- colored gravels likely of the Sevier River Formation.
    An unconformity in the Pole Creek area (Sevier Plateau) west of Antimony, western Garfield County, Utah, and its bearing on the Sevier gravity slide
    Peter D. Rowley, Robert F. Biek, David B. Hacker
    13-24
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  • View west at the geosite, within the selvage-joint phase of The Three Peaks intrusion. For scale, a rock hammer is near the base of the cliff, left of center and above the shadows on the left.
    A site bearing on the origin of iron deposits in the Iron Springs Mining District, Iron County, Utah
    Peter D. Rowley, David B. Hacker, Robert Biek
    25-37
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  • Photograph of the upper part of the Upper Jurassic Brushy Basin Member of the Morrison Formation from about 45 m south of the Cleveland-Lloyd Dinosaur Quarry. Photograph of Morrison Formation by Jonathan Warnock. Below photograph is the charophyte Aclistochara bransoni from the quarry. Left is apical view, center is lateral view, and right is basal view. See figure 3 more information.
    A Review of charophytes of the Cleveland-Lloyd Dinosaur Quarry at Jurassic National Monument in the upper part of the Morrison Formation (Late Jurassic), Emery County, Utah, USA
    Joseph E. Peterson, Jonathan P. Warnock, Jason J. Coenen, Charles A. Bills, Mateo E. Denoto
    39-47
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  • Tidwell Member of the Morrison Formation (gray bed) between the underlying Summerville Formation and sandstone beds of the Salt Wash Member of the Morrison Formation. Woodside anticline, Emery County, Utah.
    The lithostratigraphic Tidwell Member of the Morrison or Summerville Formations (Upper Jurassic)—who, what, where, when?
    Kenneth Carpenter
    49-114
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  • The Pleistocene Basalt of Antelope Flat dammed the Snake River in Swan Valley, southeast Idaho, producing hyaloclastite visible along US Highway 26.
    Geomorphic and tectonic development of Swan Valley, southeast Idaho, since the eruption of the Basalt of Antelope Flat—new 40Ar/39Ar, geochemical, and paleomagnetic data
    Stacy Henderson, Tiffany Rivera, Peter C. Lippert, Brian R. Jicha
    115-130
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