File:Annual report of the Regents (1900) (14798690283).jpg

Identifier: annualreportof5421900newy (find matches)
Title: Annual report of the Regents
Year: 1889 (1880s)
Authors: New York State Museum University of the State of New York. Board of Regents
Subjects: New York State Museum Science
Publisher: Albany : J.B. Lyon, State Printer
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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he lens-shaped type of clay deposit included in the moraine at many points,and has been worked out. A similar deposit is found at New-field 6 miles south of Ithaca, where a moraine crosses the val-ley, the clay forming a large portion of one of the morainal hills,but surrounded by till. Deposits of clay suitable for brick and tileoccur extensively in the lowlands bordering the Mohawk riverfrom Rome to Schenectady. The beds vary in thickness from 6to 15 feet and are mostly of a red, blue, or gray color. Among the most extensive and important clay formation isoccurring in IsTew York are those of the Hudson vallev.^ Hereare deposits of two types: 1) estuary deposits of fine stratifiedsand, yellow and blue clay, and 2) cross-bedded delta deposits,the materials of which are much coarser. The estuary depositsindicate a period of depression, and deposition in quiet water. 1 Geol. New York, 4th district. 1843. 2 H. Hies, Rept of N. T. state geologist, 1890. O) to a <D d CM o CO
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CLAYS OF NEW YOEK 577 The clay is chiefly blue, but where the overlying sand is wantingor is of slight thickness, it is weathered to yellow, this weather-ing often extending to a depth of 15 feet below the surface, andto a still greater depth along the line of fissures through whichthe water can percolate. The depth of oxidation is of course influ-enced by the nature of the clay, the upper portion weatheringeasily on account of its more sandy nature and hence looser text-ure. Horizontal stratification is marked and the layers of clayare separated by extremely thin laminae of sand. At some locali-ties the layers of the clay are very thin and alternate with equallythin layers of sandy clay. This condition is found at Haverstraw,Croton, Dutchess Junction, Stonypoint, Fishkill, Cornwall, ISTewWindsor, Catskill and Port Ewen. At all of the above mentionedlocalities except the last two, the clay is overlain by the delta de-posits of rivers tributary to the Hudson, and the alternation oflaye

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