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San Francisco, Oct.14,1886
Sir:
I have to report the result of my examination of the stone deposits found on the property of J.D. Farwell in Alameda County, which I visited on the 12th inst.
The locality of these deposits is near the line of the Southern Pacific R.R., about three miles from Niles Station and about one mile northerly from the track. I found here, three varieties of stone, differing somewhat in color and texture, but all constituting species of sandstone, which I classify as follows, with their characteristics:
No.1 Is known as a "buff sandstone" from its color when dressed. The extent of this quarry is large and may be traced from 300 to 400 feet along the face of the hill in which it is situated and to a height of abot 300 feet above the bed of the creek at its foot. The strata are from 5 to 10 feet in thickness, yielding blocks of almost any building dimensions when quarried, and of a remarkably uniform color throughout the deopsit. Considerable stone has been quarried here, and used in various buildings and in cemetary monuments.
The stone is easily split in very regular rectangular blocks, and dresses with little labor, giving fine surfaces and sharp arrises: it weighs something over 156 poubds to the cubic foot, and for a sandstone, is hard and dense. Its quality as a building material, is best understood by the samples of