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There was an ominous stutter in their motor, for one thing, and Casey knew of a stiffish hill a few miles this side of Rhyolite, so he forced himself to set a slow pace which they could easily follow. It was full sundown when they reached Rhyolite, which was not a town but a camp beside a spring, usually deserted.
The coarse granite of Harney Peak indicating that, as the central point of the earliest upheaval, and the three porphyries known as rhyolite, trachyte, and phonolite, showing the uplifts of later periods to have had their centers a little more to the north, but the entire area is said to be only about sixty miles long and twenty-five miles in width.
Two successive epochs of eruption of basalt appear to have been clearly established an earlier one of the "Provo Age," when the lava was extruded from the Tabernacle craters, and a later epoch, when the eruptions took place from the Ice Spring craters. The oldest volcanic rock appears to be rhyolite, which peers up in two small hills almost smothered beneath the lake deposits.
Still, red mud will work miracles of disfigurement, and Casey was an optimist by nature. "My wife is trying out a new comedy line," the man observed unemotionally. "Trouble is it never gets over, out front. If she ever did get it across the footlights, I could raise the price of admission and get away with it. How far is it to Rhyolite?" "Rhyolite? Twenty or twenty-five miles, mebby."
All about him the fresh morning was falling; yonder shone a green-mottled face of granite, and there a red iron blow-out streaked with veins of glittering silicate, and in this corner, still misted with the last delicate shades of night, glimmered rhyolite, lavender-pink. The single-jack dropped from the hand of Gregg, and his frown relaxed.
The surface of this lake is 1,250 feet above that of the ocean, and its margin is enclosed within a border of rhyolite and pitchstone rising into a mass of the same material 1,800 feet high on the eastern side. The form of the lake does not suggest that it is itself the crater of a volcano, but rather that it was originated by subsidence.
Honest, I'll be dead of starvation in another hour. What's the chance of a bite, Hon?" Contempt surged through Casey. Deep in his soul he pitied her for being tied to such an insect. Immediately he was glad that she had spirit enough to put the little runt in his place. "You would wait to buy supplies in Rhyolite, remember," she reminded her husband calmly.
Remember that, and don't overlook the twenty-five thousand dollar check that Casey had pinned safe within his pocket. Casey had unthinkingly tossed his last dime into his hat for the show people at Rhyolite. He had not even skinned the coyote, whose hide would have been worth ten or fifteen dollars, as hides go.
These rocks approach towards true granites in one direction, and through quartz-porphyry and felsite to rhyolite in another probably depending upon the conditions of cooling and consolidation. In their mode of weathering and general appearance on a large scale, they present a marked contrast to the basic lavas with which they are in contact from the coast of L. na Keal to that of L. Buy.
This division corresponds with that proposed by Bunsen and Durocher for volcanic rocks, upon the results of analyses of a large number of specimens from various districts. Examples: Basalt, Dolerite, Hornblende rock, Diorite, Diabase, Gabbro, Melaphyre, and Leucite lava. Examples: Trachyte, Rhyolite, Obsidian, Domite, Felsite, Quartz-porphyry, Granite.
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