The Geology of the Crystalline Rocks of Southeastern New York (Classic Reprint) - Softcover

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Excerpt from The Geology of the Crystalline Rocks of Southeastern New York

Putnam county to the subjacent gneiss, and from the nearly complete stratigraphic continuity, it is inferred that the crystalline limestone of Westchester county is equivalent to that of southeastern Dutchess county, the age of which has been satisfactorily established by the work of Dwight, Dana, and others to be calciferous-trenton, and the schist and micaceous gneiss overlying the limestone by like analogy is considered to be of Hudson river age.

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