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Updated: May 28, 2025
She had never been on a hawss, neither. And she mighty near rolled off down into Pitchstone Canyon, comin' up by the cut-off trail. Why, seh, I would not willingly take you through that place, except yu' promised me yu' would lead your hawss when I said to. But Hank takes the woman he had married, and he takes heavy-loaded pack-hawsses.
Their flanks were blotched with a livid nitrous efflorescence, with flaring sulphur, unhealthy verdure of pitchstone, streaks of arsenical vermilion; their beds a frantic maze of boulders. He beheld this crazy stratification, this chaos of incandescent nature, sent in a flame of deep blue sky and sea.
Strata of this nature alternate with much black and brown siliceo-calcareous slate, remarkable from the wonderful number of huge embedded logs of silicified wood. This wood, according to Mr. Some of the layers of the black siliceous slate contained irregular angular fragments of imperfect pitchstone, which I believe, as in the Uspallata range, has originated in a metamorphic process.
The commonest lava is blackish-grey or brown, either vesicular, or amygdaloidal with calcareous spar and bole: most even of the darkest varieties fuse into a pale-coloured glass. This pitchstone, as well as some purple claystone porphyry, certainly flowed in the form of streams.
Yu' cert'nly must see Pitchstone Canyon. But we'll not go there with packs. And we will get off our hawsses a good ways back. For many animals feels that there's something the matter with that place, and they act very strange about it. "The Grand Canyon is grand, and makes yu' feel good to look at it, and a geyser is grand and all right, too.
The prevailing rock has a compact purplish base, with crystals of earthy or opaque feldspar, and often with grains of quartz. There are other varieties, with an almost truly trachytic base, full of little angular vesicles and crystals of glassy feldspar; and there are beds of black perfect pitchstone, as well as of a concretionary imperfect variety.
The fragments of scoriae, embedded in the crystalline calcareous basis, are of a jet black colour, with a glossy fracture like pitchstone. Their surfaces, however, are coated with a layer of a reddish-orange, translucent substance, which can easily be scratched with a knife; hence they appear as if overlaid by a thin layer of rosin.
On a casual inspection, the whole series would be thought to be of the same plutonic or volcanic nature with the trachytic varieties and pitchstone; but this is far from being the case, as much of the porphyry is certainly of metamorphic origin.
The lower portion of the mountain is formed of bedded basalt, or dolerite with numerous dykes and veins of basalt, felstone, and pitchstone; the upper cliff, or Scuir, is composed of pitchstone of newer age, the remnant of a lava flow which once filled a river channel in the basaltic sheets. A dyke, or sheet, of porphyry is seen to be interposed between the Scuir and the basaltic sheets.
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