The gabbros and diorites of the "Cortlandt series" on the Hudson River near Peekskill, New York

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Abstract
William8-Gabbr08 and Di01'ites of the Oortlandt Serie8.439 with Cortlandt township-is mainly composed of norite, the many varieties of which were described in my last paper.In the southeastern and southwestern corners of the township, as well as on Stony Point on the opposite side of the Hudson River, olivine-norites and peridotites are found, while at other localities, mostly in the southwestern portion of the area, still different but closely allied types of massive rocks occur.These, which form the subject of the present communication, are:-Class III, Gabbro, Class IV, Diorite, Class V, Mica-Diorite.These rocks are everywhere connected so closely by intermediate forms that they may, to a certain extent, be regarded as facies of the norite.Indeed, even in the types most widely removed from the prevailing rock hypersthene is very liable to recur.There are enough general resemblances and connecting links to join all the rocks of this series into a geological unit; and at the same time there are differences suffi.cient to show that many types were successively produced fro111 the same igneous focus.CLASS III.GABBRO (von Buch.) 1. Gabbro p'1'oper.-Thisrock is to be found at only a few isolated localities, of which the most representative is " Mun-g~r's Corners," a short distance west of Montrose Station on the N. Y. C. & H.
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Authors G. H. Williams
Journal american journal of science
Year 1888
DOI
10.2475/ajs.s3-35.210.438
URL
https://doi.org/10.2475/ajs.s3-35.210.438
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