File:Annual report (1910) (14592909928).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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n each side. The age of the granite can net be affirmed. It appears to havethe strike of the adjacent gneisses ; but it did not prove possible totrace it more than a few hundred feet. The quartzite formation, orits possible equivalent, was not found resting on the granite, so thatits age could not be definitely assigned by showing an unconformity.If thrust up into the gneisses at the time of their folding, it hasescaped foliation. It probably belongs to the Precambric series. Ifso, the absence of foliation indicates that Postcambric movementsdid not contribute to the characteristic foliation of the gneisses. The eastern gneiss mass. The rocks along the northwesternbase I the eastern gneiss mass in some cases suggest a continuationof those of Shenandoah mountain. 1 The spur next east is locally known as Shenandoah mountain, fromthe hamlet of that name at its northern termination. The Shenandoahof the map is East Fishkill Hook. ■M o — >> en <v JD 03 c/l t/J V rt C u c/. —
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. — r Oj < G *+H > U U _ ,_ O O U oJ r^i o <u c GEOLOGY OF THE POUGHKEEPSIE QUADRANGLE 25 At Fowlers kaolin mine, east of Shenandoah, a rock was foundbeneath the kaolin deposits that was almost identical with the Shen-andoah mountain granite, though coarser in texture. The decom-posed rock, from which the kaolin was derived, is usually coarse,showing quartz chunks the size of a walnut in a mass of alteredfeldspar. Probably the kaolin is the product of the disintegrationof a pegmatitic granite. The clay beds are apparently not veryextensive, although their exact extent is obscured by glacial depositsalong the slope. If the kaolin is thought of as the decompositionproduct of an arkosic, conglomeratic quartzite, it is difficult toaccount for the granitoid

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