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The AAPG/Datapages Combined Publications Database

AAPG Bulletin


Volume: 65 (1981)

Issue: 5. (May)

First Page: 1010

Last Page: 1010

Title: Carboniferous-Permian Boundary Sequence of Northern Oquirrh Basin, Idaho-Utah: ABSTRACT

Author(s): Thomas E. Yancey, Raymond C. Douglass

Article Type: Meeting abstract


The Carboniferous-Permian boundary occurs in the middle of the Oquirrh Group in the northern part of the Oquirrh basin, the largest basin formed east of the Antler tectonic belt during the middle Carboniferous. Good sequences of fusulinid faunas for the northern part of the basin are exposed in the Sublett and Deep Creek Ranges of southern Idaho, a position midway between the basin's bathymetric low and the basin edge. In the Sublett Range, Late Pennsylvanian-Early Permian fusulinids occur through 1,500 m of mixed quartose sands and limestones of the Trail Canyon Formation and basal part of the overlying Hudspeth Cutoff Formation. The Missourian interval is thin relative to the Virgilian interval. Near the base of the Trail Canyon Formation, possible Missourian fusulinid aunas appear containing Triticites and Eowaeringella, and extend through a 250-m section, which is overlain by a 400-m section with Virgilian fusulinids, including Triticites sp. aff. T. cullomenensis and T. sp. aff. T. subventricosus. The Carboniferous-Permian boundary occurs at about the top of the middle limy unit of the Trail Canyon Formation, and Wolfcampian fusulinids, including Schwagerina and Pseudoschwagerina, occur through 800 m of section. Pseudofusulinella is common through Virgilian and Wolfcampian interval on the western side of the Sublett Range, but has not been found in this interval on the eastern side. Leonardian fusulinids have yet to be found here, contrary to earlier published reports.

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