Abstract

Stages in the development of the Canyon Range have been determined from structural and stratigraphic relationships of the following sedimentary units: Precambrian (?) quartzite, shale, and slate, 7950 feet (thrust contact at base of section); Tintic quartzite, 1500 feet (Lower Cambrian); Ophir shale, 975 feet (Middle Cambrian); undifferentiated limestones and dolomites, 4750 feet (Upper Cambrian and Ordovician?); Indianola (?) group, 12,500 (Upper Cretaceous); North Horn (?) and Flagstaff (?), 3500 feet (late Cretaceous and Paleocene); Oligocene conglomerates, 1200 feet; and Pleistocene and Recent alluvium. The following series of events is indicated.

  1. Uplift accompanied by folding and large scale thrusting beginning in late Jurassic (?) time and culminating in early Cretaceous time;

  2. Deep erosion, 5000-10,000 feet;

  3. Deposition of thick series of coarse clastic continental sediments (Indianola group);

  4. Folding and high-angle thrust faulting in post Indianola time, previous thrust plane folded and Precambrian (?) rocks thrust over Cretaceous rocks, displacement less than 5000 feet;

  5. Deposition of continental sediments in marginal basins, (North Horn and Flagstaff);

  6. Moderate folding in post Flagstaff time;

  7. Development of essentially the present drainage systems;

  8. Deposition of Oligocene (?) conglomerates on piedmont slopes and in canyons and valleys within range, 0–1800 feet thick;

  9. Tilting of Oligocene conglomerates;

  10. Basin and Range faulting, beginning in Miocene (?) time and continuing to Recent;

  11. Alluviation of piedmonts and deposition of Bonneville sediments followed by post-Bonneville dissection.

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