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. 1900 Excerpt: ...in Part I. The frequency of joints in bedded rocks is variable. Sometimes they crowd one another at intervals of an inch or less. At other times they are one, two, or more feet apart, up to ten or twenty, as seen in some very large flagstones. Joints are common in igneous rocks, as granite and basalt. The peculiar ...
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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. 1900 Excerpt: ...in Part I. The frequency of joints in bedded rocks is variable. Sometimes they crowd one another at intervals of an inch or less. At other times they are one, two, or more feet apart, up to ten or twenty, as seen in some very large flagstones. Joints are common in igneous rocks, as granite and basalt. The peculiar columnar jointing of lavas will be described under the structures peculiar to igneous rocks. In regions of much disturbance the joints may be very perfect, and be found cutting one another at various angles and in several systems, even as many as six or seven. The slates of Somerville, Mass., show this well. Joints are not confined to the more ancient, or even the fully consolidated rocks. They are sometimes well developed in clays which have been subject to drying and to little pressure. 218. Origin of joints.--Some joints may be due to shrinkage in drying. This and the presence of elaborate jointing in some slates point to dynamic pressure as the important cause. All parts of the earth's crust must be subject to Fig. 110.--Stream bed. Ausable Kiver, showing two systems of vertical joints. strong pressure, even where there is no metamorphism. Similar results have been produced by experiments with blocks of ice. An account of this may be found in Dana's Manual of Geology, p. 372. It is probable also that shocks of earthquakes are effective in making joint structure. 219. Fault--These are dislocations in which a mass of rock moves on the adjacent mass along a plane of division, commonly a fracture. More often the movement is vertical, or at a moderate angle from the vertical, and car Fig. 111.--Normal faults; escarpments not removed by denudation. ries sedimentary strata out of correspondence with each other. Faulting usually goes with powerful fol...
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Add this copy of A Text-Book of Geology to cart. $10.00, good condition, Sold by Crabtree's Collection rated 3.0 out of 5 stars, ships from Sebago, ME, UNITED STATES, published 1901 by Appleton.
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VG+/NONE. THIS IS THE SECOND PRINTING OF 1902. FOREST GREEN CLOTH COVERED BOARDS WITH BLACK DESIGN AND TITLES ON THE FRONT COVER AND GILT TITLES ON THE SPINE. GILT SPINE TITLES ARE BRIGHT WITH THE EXCEPTION OF "B" IN "BRIGHAM" WHICH EITHER HAS PERISHED OR IS A BINDING ERROR. THE CORNERS AND SPINE ENDS HAVE A TRACE OF RUB BUT OTHERWISE THIS IS A VERY NICE CLEAN AND TIGHT COPY.
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