File:Annual report (1910) (14593124518).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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tified; then, at the top, 3 feet of sand and gravel.The sand continues as the surface soil in the adjoining fields attain-ing a level 10 feet higher than the top of the section. Farther to thewest the deposits are of somewhat coarser materials. In manyplaces fine gravels occur, as along the road that runs northerly toCharlton village. The conditions under which Lake Alplaus was formed and thesubsequent events resulting in the present topography are clearly de-ducible from the above data. With the melting of the ice sheet a mass of debris was heapedup in the Burnt Hills district, forming morainic hills with an eleva-tion of upwards of 420 feet. The belt of morainic materials lay across the floor of the deepestportion of the Glenville rock basin in the locality west of HighMills. (ilacial waters became ponded back of the moraine dam, forminga lake, (n this lake sediments were deposited; at first from streamsderived from the melting ice and later from Alplaus creek, draining -t-> OS s
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bfl GLACIAL GEOLOGY OF THE SCHENECTADY QUADRANGLE 2*) an extensive land surface. These deposits filled the lake up to thelevel of 420 feet. The overflow waters of the lake followed lines of depressionacross the belt of moraine forming the dam. Gradually, throughdifference in rate of erosion a single outlet stream was formed andbegan to cut out the gorge east of High Mills. At the same time thelake was drained leaving the deposits in the form of a plain, 420feet in elevation. Alplaus creek and its .tributaries, by downward cutting andmeandering, have since formed broad and deep valleys in the de-posits ; while below High Mills the gorge with vertical walls ofrock in places 60 feet high, has been eroded out. 28 NEW YORK STATE MUSEUM MODIFIED TILL The surface materials thus far described, namely, the unmodifiedtill and the deposits made in Lakes Albany and Alplaus, cover aboutfive-sixths of the area of the Schenectady quadrangle. Of the re-maining area much the larger part is covered by

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