Geology of the Blue Mountain, New York, Quadrangle

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Publisher's Synopsis

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1917 Excerpt: ...island in Blue Mountain lake; small dikes cutting syenite near the western end of Long Lake bridge; small dikes cutting mixed gneisses two-thirds of a mile west of Long Lake bridge; a number of small dikes cutting the anorthosite-gabbro west of Long lake; and several small dikes cutting the large gabbro stock iy2 miles north-northeast of Indian Lake village. 1 N. Y. State Mus. Bui 182, p. 29. 1916. Veins of pure white quartz a few inches wide sometimes occur in the syenite, granite or mixed gneisses and apparently always parallel to the foliation. On top of Owl's Head mountain and also two-thirds of a mile west of Long Lake bridge, sharply defined pegmatite dikes a few inches wide were observed to cut such quartz veins (see plate 10). Within the North Creek quadrangle the writer has found diabase cutting pegmatite of the kind here described. So far as the evidence goes, therefore, this type of pegmatite is intermediate in age between the gabbro and the diabase. Graphite in pegmatite. A feature of particular interest in connection with the pegmatites is the content of graphite in two small dikes cutting Grenville limestone respectively one-half and threefifths of a mile northwest and north of the bridge across Cedar river. In addition to some large flakes of graphite, these dikes contain numerous balls or globular masses of graphite from 1 to 5 mm in diameter. They look exactly like tarnished lead shot. They occur either as inclusions in feldspar or along contacts between feldspar and quartz. When broken open these graphite balls are seen to possess a perfectly developed radiated structure. Diabase Dikes Only two small diabase dikes were located within the quadrangle. It is quite possible, if not probable, that others exist but were not encountered in the ro...

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