Download Bulletin Volume 713

Download Bulletin Volume 713

Bulletin Volume 713.cGeological Survey

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Author: Geological Survey
Page Count: 60 pages
Published Date: 14 May 2012
Publisher: Rarebooksclub.com
Publication Country: Miami Fl, United States
Language: English
ISBN: 9781231280614
File Name: Bulletin.Volume.713.pdf
Download Link: Bulletin Volume 713
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1920 Excerpt: ...in the description of T. 3 S., R. 36 E. STKUCTUHE. The geologic structure of the township is complex and involves both folding and faulting, but the influence of faulting is predominant. The general structural features of the township are shown in the geologic section (B-B', PI. III). Folds.--So far as the evidence has been interpreted the structure is marked by many relatively small folds rather than by fewer large ones. The two main ridges from sec. 23 southward and from sec. 24 northward are synclinal and anticlinal respectively, but in the eastern ridge particularly the rocks are much brecciated and seamed with calcite. Faults.--The most pronounced structural features are two faults, which, though largely concealed, leave no doubt as to their reality and produce noteworthy structural discordance. These faults are discussed on page 63. (See structure section B-B', PI. III.) The shattered condition of the rocks along the east side of the crest of the ridge in sec. 13 is the basis of the fault there shown. The rocks are comminuted and veined in a remarkable manner, but the rocks concerned are all of the earlier Paleozoic series, so that the postulated fault did not produce any great displacement. It is regarded as a branch of the great fault that enters the northeast corner of sec. 13 and that separates the older Paleozoic rocks from the Carboniferous and later rocks on the east. The small faults in the SE. sec. 12 represent similar shatter zones. In the northeast corner of sec. 25 the lower part of the Wells formation lies against the older Paleozoic rocks. The Tertiary cover conceals all but a small area of this formation in this part of the township. The nearest ledges southwest of the overthrust fault lie nearly a mile to the northwest, and thes...

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