File:Annual report (1910) (14776450231).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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t extensively eroded here. The limestones of this central strip rest against the slates on thewest by overthrust. This is best shown at the north end of theNew Hamburg tunnel (see plate 9). The occurrences of thePotsdam along this western margin is also evidence of it. Fre-quent slips along and across the strike within the limestone areprobably present. The slates along the eastern margin of the strip may be at placesin conformable relationship with the limestone. In other cases suchis almost certainly not the case. Metamorphism and alteration. The strata composing thisstrip are all visibly altered. Fossils have usually been greatlyobscured. The Beekmantown shows the metamorphism most.Fossils in it are recognized or identified usually with difficultyalthough they sometimes weather out with distinctness. The Tren-ton beds are usually somewhat crystalline, but fossils are preservedin them in better condition than in the Beekmantown. 1 Professor A. W. Grabau. Science, n. s., 221534. +J s
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GEOLOGY OF THE POUGHKEEPSIE QUADRANGLE 65 Summary and conclusion. The absence of the Trenton con-glomerate at places along the eastern margin of the central stripmight be interpreted as the result of faulting and, in any event, isprobably due in part, at least, to faulting. The presence of Tetradium cellulosum in the Pough-keepsie and Eastern Railroad cut at Pleasant Valley is noteworthy.Professor Clarke1 has indicated that elsewhere this fossil is charac-teristic of the Lowville. The Trenton conglomerate at this localityis apparently a few feet above the beds carrying this fossil. Thiswould seem to indicate that the Lowville might have been depositedhere. Doctor Ruedemann2 has discussed the Trenton, as descrbedby Dwight, as probably not lower than Midtrenton in age. The examination of this strip leaves one in great doubt as to howto represent its structure. It is certainly very different from Pro-fessor Danas early representation as a simple fold.3 It is best inter-preted as belongin

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