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Home / Geologic Maps / 1:100,000 Geologic Maps / Geologic map of the St. George and east part of the Clover Mountains 30' x 60' quadrangles, Washington and Iron Counties, Utah

Geologic map of the St. George and east part of the Clover Mountains 30' x 60' quadrangles, Washington and Iron Counties, Utah

Geologic map of the St. George and east part of the Clover Mountains 30' x 60' quadrangles, Washington and Iron Counties, Utah
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SKU M-242
Weight 1.13 lbs
 
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By: R. F. Biek, P. D. Rowley, J. M. Hayden, D. B. Hacker, G. C. Willis, L. F. Hintze, R. E. Anderson, and K. D. Brown

Southwest Utah straddles the transition zone between the Colorado Plateau and Basin and Range Province and so includes a remarkable diversity of rocks, landforms, and geologic structures. Sedimentary and volcanic rocks that collectively total over 8 miles in thickness are exposed in the map area, representing every geologic period except the Ordovician and Silurian. The oldest rocks exposed in the map area, 1.7-billion-year-old metamorphic and igneous rocks, form the core of the enigmatic Beaver Dam Mountains. Triassic and Jurassic redrock, famously exposed at Zion National Park and Snow Canyon and Quail Creek State Parks, are among the most widespread and visible strata, for they also surround major urban areas in southwest Utah. The past decade has witnessed significant new discoveries of dinosaur tracks and fossils in these local strata, shedding new light on this part of North America?s geologic history. These and other rocks, including the enormous Pine Valley laccolith and dozens of basaltic lava flows and cinder cones, are exceptionally well exposed because of widespread erosion that began when the Colorado Plateau and Basin and Range began to split apart about 17 million years ago.

This map is derived from 29 published 1:24,000-scale geologic maps that encompass the St. George 30' x 60' quadrangle and Utah part of the Clover Mountains 30' x 60' quadrangle. It also incorporates significant new unpublished field mapping of the Smith Mesa quadrangle and of six quadrangles in the Bull Valley and Pine Valley Mountains, late Tertiary and Quaternary deposits of the Mesquite basin, and the Pintura area. The resulting compilation shows the regional geology of the southwest corner of Utah in unprecedented detail.

Other Information:
Published: 2009
Pages: 108 p.
Plates: 2 pl.
Scale: 1:100,000
Location: Iron County and Washington County
Media Type: Paper Map

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