Geology of the Piseco lake quadrangle

Geology of the Ohio quadrangle, southwestern part of Adirondack Mountains, New York

“…The broad band of porphyritic gneiss in the central part of the quadrangle is well exposed in an abandoned quarry just east of Morehouseville. This band is a continuation of the porphyritic quartz syenite mapped by Cannon (1937) in the Piseco Lake quadrangle. The other large body of this rock is exposed in the northern part of the quadrangle.…”

“…CONTRIBUTIONS TO GENERAL GEOLOGY tinuation of granite gneiss from the Piseco Lake quadrangle (Cannon, 1937), occurs in the area around Fort Noble, Bethune Mountain, and Morehouseville. A body of pink granite gneiss extends westward for about 8 miles along the east edge of the quadrangle from near Bochen Lake.…”

“…Although only a small part of the dike was OHIO QUADRANGLE, SOUTHWESTERN ADIRONDACK MOUNTAINS F27 observed, it is believed to follow the stream vallej7. Cannon (1937) mapped diabase near the west edge of the Piseco Lake quadrangle along a continuation of the trend of the Fourmile Brook fault. This fault may have been intruded by a large diabase dike, but no outcrops of diabase were observed between Fourmile Brook and the dike mapped in the Piseco Lake quadrangle.…”

“…The magmatic origin of some of the granite gneiss is suggested by its relation to the intrusive rocks of Piseco dome (Cannon, 1937). Much of the pink granite gneiss is folded into an anticline that is the westerly extension of Piseco dome, and some can be traced laterally into similar granite gneiss of Piseco dome.…”

“…Gushing (1905) mapped the geology of the Little Falls quadrangle, which is directly south of the Ohio quadrangle; Miller (1909) mapped the Remsen quadrangle, which is directly west; and Smyth (1894) studied the gabbros in the southwestern Adirondack Mountains. More recently Cannon (1937) mapped the Piseco Lake quadrangle, which adjoins the Ohio quadrangle on the east. Kay (1943) reported on the stratigraphy of the Paleozoic rocks along West Canada Creek in an area southeast of the Ohio quadrangle.…”