. Report of the geological exploration of the fortieth parallel . omeolivine. The glass base is much altered, as shown in Vol. VI, Plate XI,fig. 1, which represents a thin section of a specimen obtained from Mount-ain Wells Station, on the old Overland Stage Road, a few miles south of thelimit of the map. Before returning to the region north of Granite Mountain,the thermal springs which lie at the eastern base of the range and theimmense salt-fields of Osobb Valley require some special mention; the for-mer are of interest from their evident association with the volcanic activityof the range, a
. Report of the geological exploration of the fortieth parallel . omeolivine. The glass base is much altered, as shown in Vol. VI, Plate XI,fig. 1, which represents a thin section of a specimen obtained from Mount-ain Wells Station, on the old Overland Stage Road, a few miles south of thelimit of the map. Before returning to the region north of Granite Mountain,the thermal springs which lie at the eastern base of the range and theimmense salt-fields of Osobb Valley require some special mention; the for-mer are of interest from their evident association with the volcanic activityof the range, and the latter from the economic questions connected withthe deposits. Sou Hot Springs.—Directly south of the rhyolite hills, which extendfrom McKinneys Pass, and about one-quarter of a mile from the foot ofthe slope, there rises a low mound of hot-spring tufa, covering perhaps 12acres of ground. It has built itself up to a height of at least 60 feet abovethe plain, and has generally the figure of a broad, low dome rising out of the TJ. S. Geol-Expl 40Parallel. z ffic Q sou HOT sriuxGS. 705 monotonous dreary valley. Scattered over the top are ten or twelve hot-spring pools, almost drcular in outline, varjdng from 6 to 60 feet in diame-ter, remnants of a much greater activity of thermal waters, and known asthe Sou Hot Springs. On Plate XX is given a general view of this group of hot springs, show-ing their position on the border of the valley with the Osobb Desert, stretch-ing far away to the southward. The ground is covered with a loose alkalinesoil, over which is a scanty vegetable growth, somewhat richer in the im-mediate neighborhood of the springs. In the illustration, only a few of thelarger and more elevated pools are shown, the others either lying at a lowerlevel or hidden by the inequalities of the surface. Around each springthere has been built up a secondary mound or rim of calcareous tufa, whichin some instances has contracted as it formed, producing a perfect domeo
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