MINERAL RESOURCES OF THE STATE OF NEW YORK 253 



somewhat gneissic appearance is exposed and has been quarried 

 to some extent. Its architectural use is well illustrated in the 

 buildings of the state hospital and prison at Dannemora. The 

 Dannemora Granite Company has worked the quarries occasionally 

 in recent years as demand warranted operations. In the town 

 of Wilton, Saratoga county, about 2 miles north of Saratoga Springs, 

 a grey granite outcrops on the ridge to the west of the valley. The 

 stone has a fine granular texture with occasional knots or segrega- 

 tions of pegmatite. It has been employed principally for paving 

 blocks, but some examples of its use as building stone are to be 

 found in Saratoga Springs. A handsome porph5rritic granite with 

 pink feldspar in a ground mass of dark grey color occurs at Horicon, 

 Warren county, near the outlet of Brant lake. At White Lake, 

 Oneida county, is found a pink, fine-grained granite that has been 

 quarried to a limited extent and near Gloversville, Fulton county, 

 occurs a dark grey biotite gneiss which has been employed for 

 architectural and general building purposes. 



A variety of granitic materials is found in the Highlands region 

 of southeastern New York in Orange, Putnam and Westchester 

 counties. Perhaps the best known of the granites for building work 

 is the Mohegan granite which occurs in a large boss 5 miles east of 

 Peekskill. Two colored varieties of the granite occur, one a light 

 grey or pink in hue and the other a rich yellow or yellowish brown. 

 The latter has scarcely a rival in beauty and uniformity of color 

 among eastern granites and its warm subdued effect in buildings 

 has won favor wherever the stone has been introduced. It has been 

 employed in many large structures in New York City. The Mohegan 

 Granite Company has been the largest producer of this grade. The 

 grey granite is represented in the new Croton dam and in some of 

 the buildings in the towns along the Hudson river. In southern 

 Westchester county occurs a light-colored gneissic granite which 

 has been commonly called the Yonkers gneiss and belongs to one 

 of the earlier Precambrian intrusions in the Highlands region. It 

 is quite free of knots and streaks, but almost invariably shows a 

 parallel structure in the arrangement of the mica. It occurs in 

 several areas of which the principal one forms a belt that parallels 

 the Bronx river, and Harlem Railroad from a point just south of 

 Mount Vernon to Hartsdale and White Plains. A second area of con- 

 siderable extent lies along the axis of the main belt, but farther 

 north near Valhalla. In the latter area are situated the quarries 

 that have supplied the stone for the immense Kensico reservoir 

 dam, which is remarkable for its architectural features as well as 



