File:Annual report of the United States Geological Survey to the Secretary of the Interior (1895) (14594814440).jpg

Identifier: annualreportofun1711geol (find matches)
Title: Annual report of the United States Geological Survey to the Secretary of the Interior
Year: 1880 (1880s)
Authors: Geological Survey (U.S.)
Subjects: Geological Survey (U.S.) Geology Water-supply Forest reserves Mines and mineral resources
Publisher: Washington : G.P.O.
Contributing Library: University of Illinois Urbana-Champaign
Digitizing Sponsor: University of Illinois Urbana-Champaign

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rkings of the WestBarnstable Brick Company. At this point the clays vary much in char-acter. Dense blue clay, at one time locally used for making pottery,gives place a few yards off, on the same level, to light-colored clays, withbleached quartz sand admixed in a way to give the clays the appear-ance of having been made over in part from the Cretaceous and Ter-tiary deposits which occur along the southern coast of Massachusetts.The upper surface of these clays is manifestly eroded and overlain bydeposits of till and stratified sands of glacial origin. Differences oflevel of as much as 10 feet are to be observed in the above-named work-ings. The depressions thus indicated are filled in with the stratifieddrift mentioned above. Bowlders of glacial origin occur in the upperpart of the clays and are conspicuous upon the surface of the clay forma-tion in the adjoining fields. The till of the moraine, largely sandy, con-tains a noticeable proportion of clay, as does also the material of the
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WOODWORTH.) GEOGRAPHICAL DISTRIBUTION. 985 overwash plain on the south side of the morainal wall. The clay is solarge an element in these stratified deposits adjacent to the moraine thatthe surface cracks in dry weather in a manner unknown on the sandplains westward of Cape Cod Bay. This excess of clay in depositswhich elsewhere are typically sandy is apparently to be explained bythe action of the ice sheet in eroding in its last advance the clay forma-tion in the Cape Cod Bay area. The so called clay pounds which are met with in the area of thesand plains on the south of the moraine are interpreted by the seniorauthor as projecting or disrupted portionsof the nnderlyingclays, betterexposed on the northern side of the moraine at its base. From the region near the head of Buzzards Bay and northwardalong the western shore of Cape Cod Bay, through Plymouth into Dux-bnry and Marshfield, coarse glacial detritus abounds in the form of aninterlobate moraine, laid down in part along the margi

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