Geologic Map of the Haycock Mountain Quadrangle, Garfield County, Utah (M-269dm)

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1:24,000 Geologic Maps
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By: Robert F. Biek, John J. Anderson, Edward G. Sable, and Peter D. Rowley

The Haycock Mountain quadrangle lies in the central part of the Markagunt Plateau in southwest Utah and includes the eastern part of Panguitch Lake, a popular area of summer and winter recreational use. Despite the plateau's relatively simple structure of a gently east-tilted fault block, the quadrangle contains scenic and instructive exposures of south-west Utah's youngest basaltic lava flows, classic examples of inverted valleys capped by older lava flows, and the southern margin of the Markagunt Megabreccia, including newly identified, exceptionally instructive exposures of its basil slip surface. The Megabreccia is the debris of Utah's largest catastrophic landslide deposit, which covers 1300 square miles (3400 km²) of the northern and central Markagunt Plateau.

Other Information:
Published: 2014
Pages: 36
Plates: 2
Scale: 1:24,000
Includes GIS data
Location: Utah
Media Type: Paper Publication

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