Interim Geologic Map of the Devils Slide Quadrangle, Morgan, and Summit Counties, Utah (OFR-691)

By: James C. Coogan

The Devils Slide quadrangle is located northeast of Salt Lake City and southeast of Ogden, Utah along a national east-west transportation corridor (U.S. Interstate Highway 84 and the Union Pacific Railroad). The Weber River crosses the quadrangle, and cut Upper Weber Canyon between Henefer and Round Valleys. The valleys of Lost Creek and Main Canyon Creek (an extension of East Canyon) also enter the quadrangle. Pennsylvanian through Permian marine sedimentary strata and Mesozoic (Triassic and Jurassic) sedimentary rocks are exposed in an east-dipping homocline on both sides of Upper Weber Canyon. Conglomeratic rocks of the Cretaceous Weber Canyon and Evanston Formations are exposed on the east flank of the homocline, and unconformably overlie these older rocks. These synorogenic conglomeratic rocks and related thrust faults are unconformably overlain by the at least locally conglomeratic Tertiary Wasatch Formation. In addition to the conglomerates, the quadrangle is geologically significant for its well-exposed Mesozoic rocks, salt (NaCl), and phosphate. The Jurassic Twin Creek Limestone is the feed source for the cement plant at Devils Slide and a salt welt is present in subsurface in the Jurassic Preuss Formation in the Lost Creek and Main Canyon Creek valleys and is better developed to the south in the East Canyon graben. During phosphate exploration, two trenches were excavated across the Permian Meade Peak Member of the Phosphoria Formation south of U.S. Interstate Highway 84 east of Taggarts.

Other Information:
Published: 2018
Pages: 37
Plates: 1
Scale: 1:24,000
Location: Utah
Media Type: Paper Publication