Most of the granite works in the country are suited for rough work only, and the stone is quarried for local use. A coarse-grained gneiss, striped alternately light and dark, which is quarried near Hastings, is extensively used in New York City for general construction purposes.

The Tuckahoe marble is quarried at several points. The following interesting account of the belts of Dolomite of Archiean age in which these

quarries are, is taken from " Notes by Professors Cook and Smock," published in the census reports (vol. X.)

" One of these belts reaches New York Island, crossing the Harlem River at King's Bridge; another crops on the Sound near Rochelle; others strike the river at Hastings, Dobb's Ferry, Sing Sing and other points, and furnish stones good for construction purposes and of varied colors. The best marble obtained from these deposits are those of Tuckahoe and Pleasantville. The first is white, rather coarse in texture and regular in quality, and the better grades have been used for some of the finest buildings in the City of New York, notably St. Patrick's Cathedral. The color changes to light gray by exposure.

" At the quarry of the Tuckahoe Marble Company the finest grade is nearly a pure white, but this is available only in small quantities, and is used for monumental and ornamental work. In Mr. John F. Masterdon's quarry this same material is quarried more extensively.

" In composition the stone from these quarries is a Dolomite, containing a small amount of iron and some mica. The buildings constructed of the stone from the Tuckahoe Marble Company's quarry are those of the New York Stock Exchange, New York City, and the Mutual Life Insurance Company, at Boston. Those constructed of the material from Mr. Masterdon's quarry are the New York Life Insurance building, New York City, the City Hall, Brooklyn, N.