Bulletin - United States Geological Survey Volume 521 by Geological Survey
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Author: Geological Survey
Page Count: 68 pages
Published Date: 09 May 2012
Publisher: Rarebooksclub.com
Publication Country: Miami Fl, United States
Language: English
ISBN: 9781231134931
File size: 19 Mb
File Name: Bulletin.-.United.States.Geological.Survey.Volume.521.pdf
Download Link: Bulletin - United States Geological Survey Volume 521
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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. 1912 Excerpt: ...series illustrates these facts very welI. Where a bed has been elongated or faulted the original continuity has been modified or interrupted. FOLDED BEDDING. The western Vermont marble region, as shown by the general and detailed sections (Pls. II, III), is one of folding, so that horizontal beds are exceptionaI. They are only to be expected at the bottoms of the troughs or the tops of the arches of the folds, and therefore can hardly retain their horizontality for any great distance. An idea of the folds of the region can be obtained by observing the minute folds in the little grayish dolomitic beds within the clouded marbles. These small folds, as it were, epitomize the large ones. The folding of the strata is the fundamental character of the region and the primary factor controlling the vertical and horizontal distribution of the marble. If a series of beds plunges in at one point it should emerge at another, for it is but part of a fold, and for the same reason if a series of beds emerges at one point, unless it is at the actual offshore beginning of the formation or unless faulting has occurred, the beds should be found to the east or west going down again and completing degrees away from the horizontal to the verticaI. Folds are known as open or close. A close normal fold is one shaped somewhat like a letter U, with both limbs parallel and pressed together. Most of the folds in the Taconic region are made up of minor folds. This is shown on a large scale in the east limb of the anticline exposed in the West Rutland quarries (fig. 17, p. 122, and PI. XII). The limbs of close folds in this region are in places so compressed as to resemble in cross section the longitudinal section of a bottle. A small fold of this kind near Brandon is shown in figure 10....
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