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Updated: May 31, 2025
The road, having been cut in the side of the cliff, exposed layers of brown argillaceous schist, like rotten wood, and so friable that it crumbled between the fingers; but what was more remarkable was that the layers, scarcely thicker than slate, instead of being on their natural plane, were turned up quite vertically. I was now ascending to the barren uplands.
Between Roche-Vive and Montegnac there are three distinct mountains with three hollows between them, down which the waters, stopped by the schist barrier, turn off into the Gabou.
Near the Lake, and along its eastern shore, we have mica schist and gneiss foliated, with a great deal of hornblende; but the most remarkable feature of it is that the rocks are all tilted on edge, or slightly inclined to the Lake. The active agent in effecting this is not visible. It looks as if a sudden rent had been made, so as to form the Lake, and tilt all these rocks nearly over.
Even in this favoured position the heat in summer is almost unendurable, making Maskat one of the least coveted posts that the Indian Government has at its disposal. The cliffs immediately round the town are of a shiny schist, almost impossible to walk upon, and reflect the rays of the sun with great intensity.
Here the granite crops out again in great rounded masses which change the dip of the gneiss and mica schist rocks from the westward to the eastward.
In the peninsula of Araya, the naphtha flows from the primitive rock itself; and this phenomenon acquires new importance, when we recollect that the same primitive rocks contain the subterranean fires, that on the brink of burning craters the smell of petroleum is perceived from time to time, and that the greater part of the hot springs of America rise from gneiss and micaceous schist.
Here the whole Wady, some two miles broad, was barred with quartz, in gravel of the same rock, and in veins which, protruding from the dark schist, suggested that it underlies the whole surface.
The neighboring rocks furnish the foundation stones and stones for the furnaces; the decomposed schist gives the cement and refractory coating, and the forest provides the wood necessary for the construction of the road, sheds, etc.
Why should the schist pendant of the Tappock chamber be all right, if the claystone pendant of Dunbuie be all wrong? One of them seems to me to have as good a claim to our respectful consideration as the other, and, like Sir John Evans, I shall now turn to Portugal in search of similar objects of undisputed authenticity. One plaque is certainly meant to represent the human form.
In part it approaches in character to a green and blue roofing-slate, while part is extremely quartzose, the whole mass passing downward into micaceous schist. The vertical section here exhibited is about three feet in height, and the layers are sometimes so thin that fifty may be counted in the thickness of an inch. Some of them consist of pure quartz.
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