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gas and traces of petroleum. at 1400 feet there is less salt (not very perceptible to the taste) but more borax and the water has a temperature of 90° or thereabouts. Below the gravel it becomes more saline again  It is not potable below 1100 feet. 20 miles east from Stockton at the edge of the foot hills at about 200 feet struck a layer of waterworn granite cobblestones in a volcanic matrix, after boring through this over 100 feet, came to gravel & sand as in the valley and got no more rock in that boring which was carried to over 900 feet.
The gravel is traceable to the Sierras, the sand and clay from the Sierra side is different in texture and color from that on the Coast Bay side of the valley. But on the latter side after boring through about