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In this neighborhood, he saw on the rocky banks of the river several prismoids of basaltes, rising to the height of fifty or sixty feet. Nothing particularly worthy of note occurred during several days as the party proceeded up along Snake River and across its tributary streams.
The particular structure of those lime-stone strata, with the body of basaltes or subterraneous lava which is interposed among them, shows evidently the former connection of those two banks of the river, by solid matter, the same as that which we see left there, and in the flanks of those hills.
Having thus given a view of a large tract of country where the strata are indurated or consolidated and extremely elevated, without the least appearance of subterraneous fire or volcanic productions, it will now be proper to compare with this another tract of country, where the strata, though not erected to that extreme degree, have nevertheless been evidently elevated, and, which is principally to the present purpose, are superincumbent upon immense beds of basaltes or subterranean lava.
My representing to them that there was no smoke here in the morning would have been of no avail, had not this eternal fire gone out before night, and no more smoke been seen after. They were still more positive that the elevations were pillars of basaltes, like those which compose the Giant's Causeway in Ireland.
I considered the trophy of Marius as a very curious piece of sculpture, and admired the two sphinxes at the bottom of the stairs leading to this Piazza, as the only good specimens of design I have ever seen from Aegypt: for the two idols of that country, which stand in the ground floor of the Musaeum of the Capitol, and indeed all the Aegyptian statues in the Camera Aegyptiaca of this very building, are such monstrous misrepresentations of nature, that they never could have obtained a place among the statues of Rome, except as curiosities of foreign superstition, or on account of the materials, as they are generally of basaltes, porphyry, or oriental granite.
I have a specimen of steatetical whinstone or basaltes from some part of Cumberland, in which is contained many nodules of the most perfect and beautiful plumbago. It is dispersed through this stone in rounded masses of all sizes from a nut to a pin's head; and many of these are mixed with pyrites. There is therefore reason to believe that this plumbago had been in fusion.
Beyond this, indeed, there appears to be something above the schistus; and great blocks of a red whin-stone or basaltes come down from the height and lie upon the shore; but we could not perceive distinctly how the upper mass is connected with the vertical schistus which is continued below.
This great naturalist is convinced that the spar had not been here introduced by infiltration, although that is the very method which he employs to form concretions, not only of spar but of crystal, zeolite, and pyrites, in the closest cavities of the most solid rocks of basaltes.
If the theory now given be just, a rock of marble is no less a mark of subterraneous fire and fusion, than that of the basaltes; and the flowing of basaltic streams among strata broken and displaced, affords the most satisfactory evidence of those operations by which the body of our land had been elevated above the surface of the sea; but it gives no proof that the eruptive force of mineral vapours had been discharged in a burning mountain.
These irregularities may either be attended with an injected body of subterraneous lava or basaltes, here termed whin-stone, or they may not be attended, at least apparently, i.e. immediately, with any such accident. But experienced miners know, that, in approaching to any of those injected masses of stone, which are so frequent in this country, their coal is more and more subject to be troubled.
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