. Report of the geological exploration of the fortieth parallel . )ression east of the Hum-boldt Range is divided into two valleys, known as Antelope and RubyValleys, separated by a low cross-ridge of limestones and basalts, extending-from S])ruce Mountain in a northwest direction to the Archa?an Ijody of theHumboldt Range. Its highest summit in the region of Spruce ^loimtainbarely rises 600 feet above the valley, A\hile its western end falls away inlow, rounded hills. No fossils were found in the limestone, but there canhe little doubt that it belongs to the Wahsatch limestone. The basalts, i
. Report of the geological exploration of the fortieth parallel . )ression east of the Hum-boldt Range is divided into two valleys, known as Antelope and RubyValleys, separated by a low cross-ridge of limestones and basalts, extending-from S])ruce Mountain in a northwest direction to the Archa?an Ijody of theHumboldt Range. Its highest summit in the region of Spruce ^loimtainbarely rises 600 feet above the valley, A\hile its western end falls away inlow, rounded hills. No fossils were found in the limestone, but there canhe little doubt that it belongs to the Wahsatch limestone. The basalts, iine-grained, black rocks, occur, breaking through the limestones in a number ofplaces, and forming the summit for ;i considerable distance. In the south-west corner of Antelope Valley, between Eagle Lake and the main range,is found a large hot spring, so completely surrounded by the Quaternarydeposits that it is diiHeult to recognize the formation through which it U-S CenlEzpl «Psa-n^el Fl; ATK .XIX. < O 31 O ■J EAST HUMBOLDT RANGE. 541 breaks. It a stream of clear water toward tlie lake, but leaves, upon evaporation, a thin crust of alkaline salts. This incrustation, upon being subjected to chemical analysis by Mr. R. W. Woodward, yielded tlie following result: Soda (j Sodium .. Potassa . Carbonic acid . _. . Carbonic acid (excess over monocarbonate) Sulphuric acid Chlorine ... Boracic acid trace Phosphoric acid . trace bases with acids, we have: Carbonate and sesquicarbonate of soda Sulphate of soda Sulphate of potassa Chloride of sodium Excess of sulphuric acid Ruby Valley, near the northeast shore of Ruby Lake, another hotspring reaches the surface, which deposits upon evaporation a siliceoussinter, a product of much less connnon occurrence from hot springs inNevada than are the salts of the alkalies. This incrustation yielded W. Woodward: Silica. - - 88
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