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. 1888 Excerpt: ...15,000 feet of strata belonging to one section of the Tertiary when all the beds on the eastern shore of the continent belonging to this age do not aggregate more than one-third of that thickness. ORIGIN AND NATURE OF THE ROCKS OF THE VINEYARD SERIES. The only hypothesis which affords any satisfactory way out of the ...
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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. 1888 Excerpt: ...15,000 feet of strata belonging to one section of the Tertiary when all the beds on the eastern shore of the continent belonging to this age do not aggregate more than one-third of that thickness. ORIGIN AND NATURE OF THE ROCKS OF THE VINEYARD SERIES. The only hypothesis which affords any satisfactory way out of the above-described perplexity is the following: We must suppose that the Vineyard section is not a normal, stratified deposit at all, but that it belongs to the important class of cross-bedded deposits, such as are formed by continuously acting and strong currents. In this particular case the deposits were formed at the mouth of a great river. The beds seen in the great section at Gay Head, and probably all those in Chilmark and Tisbury as well, were deposited in succession upon the advancing border of the delta of that stream. So little attention has been paid to the phenomena of cross-bedding that it may be as well to explain more clearly what is meant by the term as it is now used. Ordinary beds of stratified rock are commonly deposited in horizontal layers on the bottom of water-covered basins. Such beds may have an indefinitely wide extension: a single layer may often be traced for scores of miles. Such ordinary beds do not begin or end suddenly except with the shore lines. They may change their character, but they may be traced, theoretically at least, as continuous, equivalent sheets, varying only in thickness and in composition across the floor of the seas. Where, however, sedimentary matter is pushed out to sea by a river current, it builds strata in the form of inclined layers on the outer verge of a shelf, as is shown in the diagram (Fig. 60). These layers have a very limited extension in any direction, and therefore they may be accumula...
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Add this copy of Report On The Geology Of Martha's Vineyard to cart. $35.58, new condition, Sold by Ingram Customer Returns Center rated 5.0 out of 5 stars, ships from NV, USA, published 2022 by Legare Street Press.
