Geologic map of the Lucin 4 SW quadrangle, Box Elder County, Utah (M-130)

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1:24,000 Geologic Maps

By: D. M. Miller

The Lucin 4 NW 7.5-minute quadrangle lies in northwestern Utah and includes part of the northern Silver Island Mountains and the adjacent Great Salt Lake Desert. A thick sequence of miogeoclinal Paleozoic rocks, ranging from Cambrian to Permian in age, underlies the Silver Island Mountains. Cambrian to Devonian rocks in this sequence are exposed in the quadrangle. This sequence was faulted and then intruded by several Jurassic granitoid plutons and numerous dikes. During the Cenozoic, the mountain range was blocked out by north-striking basin-and-range faults that separate it from adjacent basins containing thick Cenozoic deposits. During Pleistocene time, Lake Bonneville inundated much of the quadrangle area; shorelines cut into bedrock and alluvial fans indicate that the lake reached about 1589 meters at its maximum depth.

Current detailed geologic mapping has updated several aspects of the stratigraphy and structure of Paleozoic rocks at Crater Island and has firmly established the age of granitoids as Jurassic. The basic map pattern of stratigraphic units and portrayal of structures have not changed dramatically with respect to Anderson's pioneer mapping, but the new refinements have aided considerably in our understanding of several regional geologic problems. This report on the Lucin 4 SW quadrangle was prepared with a companion report on the adjacent Crater Island quadrangle.

Other Information:
Published: 1990
Pages: 13 p.
Plates: 2 pl.
Scale: 1:24,000
Location: Box Elder County
Media Type: Paper Map

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