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The AAPG/Datapages Combined Publications Database

AAPG Bulletin


Volume: 68 (1984)

Issue: 7. (July)

First Page: 942

Last Page: 943

Title: Geology of Scipio Pass Quadrangle, Millard County, Utah: ABSTRACT

Author(s): Roger Michaels


The Scipio Pass quadrangle is comprised of three separate packages of stratigraphy: (1) the Canyon Range Precambrian and Cambrian allochthonous section, (2) the Pavant allochthon of Paleozoic carbonates and quartzites, and (3) a thick Cretaceous to Quaternary blanket of coarse clastics that unconformably overlies the other packages. A fourth package, the Pavant autochthon, is inferred in the subsurface. Mesozoic rocks of this package crop out farther south where the Jurassic Navajo Sandstone is overlain in thrust contact by the Cambrian Tintic Quartzite.

Based on lithology and biostratigraphic evidence, the heretofore undivided Cambrian section of the Pavant allochthon correlates well with the

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East Tintic section to the north, but differs notably from the Cambrian section of the Canyon Range allochthon, which closely parallels the House Range stratigraphy. Juxtaposition of two separate Cambrian packages is attributed to a major Cretaceous thrusting episode during the Sevier orogeny. The Canyon Range allochthon placed Precambrian and Cambrian rocks on top of Cambrian through Devonian rocks of the Pavant allochthon. Later detachment of the Pavant allochthon emplaced the Paleozoic section over the Mesozoic rocks farther east. Movement of the Pavant allochthon carried the Canyon Range allochthon "piggyback." Folding of both allochthonous sheets occurred, and Precambrian klippen of the Canyon Range allochthon are preserved, in two major synclinal troughs. Miocene to Holocene blo k faulting elevated and exhumed both the Canyon and Pavant Ranges from beneath their cover of self-derived conglomerates.

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