Bulletin of the United States Geological Survey-Pre-Cambrian Geology of North America (1908) (14771348512)

Identifier: bulletinofunited352leew (find matches)
Title: Bulletin of the United States Geological Survey--Pre-Cambrian Geology of North America
Year: 1908 (1900s)
Authors: Lee, Willis T.
Subjects:
Publisher:
Contributing Library: Clemson University Libraries
Digitizing Sponsor: LYRASIS Members and Sloan Foundation



Text Appearing Before Image:
A, RHYOLITIC ASH NEAR KINGMAN.
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11. DETRITUS AT MOUTH OF DELUGE WASH. DETAILS OF HIGHLANDS. 23 prospects have not been extensively developed owing to the inaccessi-bility of the region. Overlying the granite south of Artillery Peak occur thick massesof effusive rock similar in appearance to the older effusives of theAquarius Mountains to the east, but separated from them by erosion.Quaternary lavas also occur in small quantities included in and over-lying the gravels in Signal and Williams canyons. WHITE HILLS. Location,—The White Hills, located in the north-central part of theregion described, are the southward continuation of the Virgin Moun-tains of southeastern Nevada, and are separated from them by VirginCanyon. Topographic features.—The White Hills consist of many more orless isolated peaks and groups of hills rising a few hundred feet abovethe plains on either side of them, and are inconspicuous as comparedwith neighboring highlands. Rock masses.—Granite similar in general appearance to thatbeneath the