Reconnaissance Geology of the Southern Muggins Mountains Yuma County, Arizona

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Summary and conclusion: More than 4000 feet of Lower Miocene lake sediments were deposited upon a gneissic basement rock, at least locally. The sediments have been gently folded into broad anticlines and synclines and have been cut by high-angle faults with displacements on the order of 100 feet. Both basaltic (?) and acid andesitic lavas have intruded the sediments. A Pleistocene (?) conglomerate unconformably overlies all older exposed rocks. The lake sediments were considered to overlie the adjacent thick series of andesite flows (l). This was not established by a cursory examination. The sediments appeared to be in fault contact … continued below

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4 p. : ill., map ; 28 cm.

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Reyner, Millard L. & Ashwill, Walter R. January 1958.

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  • Main Title: Reconnaissance Geology of the Southern Muggins Mountains Yuma County, Arizona
  • Added Title: TM (Series)
  • Series Title: Atomic Energy Commission Reports
  • Added Title: Atomic Energy Commission Technical Memorandum 277

Description

Summary and conclusion: More than 4000 feet of Lower Miocene lake sediments were deposited upon a gneissic basement rock, at least locally. The sediments have been gently folded into broad anticlines and synclines and have been cut by high-angle faults with displacements on the order of 100 feet. Both basaltic (?) and acid andesitic lavas have intruded the sediments. A Pleistocene (?) conglomerate unconformably overlies all older exposed rocks. The lake sediments were considered to overlie the adjacent thick series of andesite flows (l). This was not established by a cursory examination. The sediments appeared to be in fault contact with the lavas although the relationship was always obscured by the younger conglomerate or alluvial cover. Since a dike of this acid andesitic composition was observed cutting the sediments, there is a possibility that the lake sediments are older than or contemporaneous with the thick extrusive andesite series.

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4 p. : ill., map ; 28 cm.

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  • OCLC: 959984054
  • SuDoc Number: Y 3.At 7:22/TM-277
  • Report No.: TM-277
  • Archival Resource Key: ark:/67531/metadc784389

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Technical Report Archive and Image Library

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  • January 1958

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  • July 14, 2017, 6:39 a.m.

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  • July 19, 2017, 4:08 p.m.

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Reyner, Millard L. & Ashwill, Walter R. Reconnaissance Geology of the Southern Muggins Mountains Yuma County, Arizona, report, January 1958; Washington D.C. (U.S.). (https://digital.library.unt.edu/ark:/67531/metadc784389/: accessed May 29, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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