File:Annual report (1910) (14593097169).jpg

Identifier: annualreport6421910newy (find matches)
Title: Annual report
Year: 1902 (1900s)
Authors: New York State Museum
Subjects: New York State Museum Science Science
Publisher: Albany : University of the State of New York
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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e basin of the river. They wrere de-posited under comparatively tranquil and constant conditions asshown by the even horizontality and the fineness of the laminationsof the clays. This was due to the fact that the force of the currentshad already been largely spent, the river entering the lake somemiles to the west. At a later time sediments composed chiefly of sand were broughtinto the lake and deposited upon the clays already laid down. Thesesands were evidently derived from the gneissic and other crystallinerocks of the Precambric formations. As the southern slopes ofthe Adirondack region became freed from ice the streams tributaryto the Mohawk from the north contributed their load of sedimentsand these coarser materials were borne to Lake Albany. The power-ful currents swepl the sands far out into the lake, building a broaddelta which eventually merged with similar accumulations formedin the 1 (udson channel. With the subsidence of the waters of Lake Albany the sands be- CO<V s
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>, -d rt C/3 bo a GLACIAL GEOLOGY OF THE SCHENECTADY QUADRANGLE 21 came the surface materials of the sand plain. At the same time thecurrents of the Mohawk, now confined to their channel, cut power-fully into the western edge of the mass of deposits. Gradually thebasin at Schenectady, bounded by the bluff which still parallels thecourse of the river, was eroded out. To what depth below the level of the present surface of the basinthe mass of deposits extends is not known. I am informed by MrJ. L. Fitzgerald, City Engineer of Schenectady, that a boring wasmade under his direction, in connection with locating a site for agas tank, at a point near Villa road, some 400 feet from the foot ofthe bluff, and that a depth of 50 or 60 feet of sands and clays waspenetrated. The sands are described by him as quicksands, con-sisting of rounded grains. He states that the sands occurred in lay-ers, with thin partings of clay. I am also informed by Mr B. B.Steers, manager of the Schenectady Gas Co

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