Geologic Map of the Ophir Quadrangle, Tooele County, Utah (M-257dm)

M257
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1:24,000 Geologic Maps
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By: Stefan M. Kirby

This map represents the geology of the Ophir quadrangle at 1:24,000 scale. The Ophir quadrangle, in southeastern Tooele County, Utah, includes part of the Oquirrh Mountains and an adjoining part of Rush Valley. Quaternary unconsolidated deposits cover the southwestern two-thirds of the quadrangle, and are broadly divisible into alluvial and lacustrine deposits that are separated by the highstand shoreline of Lake Bonneville. A series of down-to-the-southwest normal faults cut unconsolidated deposits and bedrock parallel to the margin of the Oquirrh Mountains and define the southern Oquirrh Mountain fault zone. Bedrock includes Pennsylvanian-to Cambrian-age sedimentary rocks exposed in the Oquirrh Mountains, which are broadly folded across the north-northwest tranding Ophir anticline. Igneous rocks include rhyolite dikes and other intrusions, and at least two magic dikes that cut across sedimentary bedding and some faults at high angles.Â

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Other Information:
Published: 2012
Pages: 13
Plates: 2
Scale: 1:24,000
Location: Utah
Media Type: Paper Publication

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