Reconnaissance Geology of the Southern Muggins Mountains Yuma County, Arizona
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 …
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Date:
January 1958
Creator:
Reyner, Millard L. & Ashwill, Walter R.
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