File:Annual report (1910) (14776408011).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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the most convincing evidence of a sedimentaryseries in these gneisses. Dr C. P. Berkey has discovered such lime-stones in the Highlands farther south1 and in the Fordham gneiss ofNew York city.2 The possibility that the basic rock and bastiteledges at Hortontown, described in the following pages, might bealtered calcareous and magnesian sediments of Precambric agewas considered, but the field relations do not easily permit thisinterpretation. Taken as a whole, the gneisses in this quadrangle present sufficientdiversity to be considered, at least in part, as an altered sedimen-tary series. NAME AND CORRELATION Dr C. P. Berkey3 has correlated the basal member of the Man-hattan series with the basal gneisses of the Highlands and has 1 Structural and Stratigraphic Features of the Basal Gneisses of theHighlands. N. Y. State Mus. Bui. 107, 1907. 2 Science, n. s., 37 1936. 3 Structural and Stratigraphic Features of the Basal Gneisses of theHighlands. N. Y. State Mus. Bui. 107, 1907, p. 361.
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GEOLOGY OF THE POUGHKEEPSIE QUADRANGLE 37 called the whole the Fordham gneiss. This he correlates with theGrenville of Canada and the Adirondacks. THE HORTONTOWN BASIC ERUPTIVE ANDASSOCIATED METAMORPHIC ROCKS General relations. In the orchard by the house and near thebarn on the farm of Albert Lawrence at Hortontown, are severaloutcrops of a massive, compact, greenish rock. One or two ledgesare of moderate size, but most of the outcrops are small and incon-spicuous. This rock is traceable only a short way to the north orsouth by actual outcrops, but in the fields and stone walls south ofthe orchard there are numerous boulders of this rock. The actualledges disappear beneath the hill to the southwest of the orchard.At the summit of this hill, in a west by southwest direction fromthe house, and about 200 or 300 yards away, are numerous ledgesof a rusty, blackish rock, which may be followed to the southwestfor a short distance and then are lost. Just to the west of theseoutcrops, on both

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