Geology of the City of New York (Classic Reprint)

The Third Edition of the Geology of the City of New Yoric is much enlarged over theS econd: first, through the necessary additions of further geological studies of Manhattan Island by various investigators, and second, through the desirable extension of the geology of Brookljm Borough, which is made the justification of epitomizing the geology of Long I sland. The mineralogical detail has been more fully given, and, in a few expository sections, brief outlines of theS econd Edition have undergone apposite elaboration. The author acknowledges the courteous assistance of the United States Geological Survey, by valuable loans of original drawings; that of theS tate Geologist of New York, through his permission to copy an outline map of a hypothetical glacial condition on Long I sland, presented by Professor J. B. Woodworth; and that of Dr. Wallace G. Levison, in the use of plates to illustrate his unique find of Chrysoberyl on Manhattan I sland. Riecent contributions to the geology of the crystalline rocks of southeastern New York by Professor Chas. P. Berkey has brought into prominence views of the ordinal position of theM anhattan rocks, substantially in agreement with those held previously in theS econd Edition of this work, and here reiterated. These rocks, instead of representing an ordovician andS ilurian placement, are referred, by that distinguished investigator, to pre-C ambrian sediments,, which, in a chronology not easily anywhere made certain, allies them to archxan or azoic formations. A nother moot question settled by Professor Berkey is that of the interlamination of the limestones a.
(Typographical errors above are due to OCR software and don't occur in the book.)

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