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Updated: June 26, 2025
A few days after making these interesting discoveries, I found other well-preserved glacial traces on Arc Dome, the culminating summit of the Toyabe Range. On its northeastern slopes there are two small glacier lakes, and the basins of two others which have recently been filled with down-washed detritus.
Occasionally in the spring, great masses of this detritus slide down the mountains, and cover the snow-drifts in the valleys, thus forming natural ice-houses. We rode over one, the height of which was far below the limit of perpetual snow. As the evening drew to a close, we reached a singular basin-like plain, called the Valle del Yeso.
It is characteristic of the sediments deposited within the influence of the continental detritus that they vary very much in their action, and that this variation takes place not only horizontally along the shores in the same stratum, but vertically, in the succession of the beds. It also may be traced down the slope from the coast line to deep water.
They may be cast forth by volcanoes, making their journey by being shot through the air, or by flowing in lava streams; it is always easy at a glance, save in very rare instances, to determine whether fragments have thus been conveyed. Again, the detritus may be moved by the wind; this action is limited; it only affects dust, sand, and very small pebbles, and is easily discriminated.
A continent of complex structure, exposing many strata irregularly distributed, raised to various levels, tilted up at all angles, will, under the same denuding agencies, give origin to innumerable and involved results: each district must be differently modified; each river must carry down a different kind of detritus; each deposit must be differently distributed by the entangled currents, tidal and other, which wash the contorted shores; and this multiplication of results must manifestly be greatest where the complexity of surface is greatest.
It was well that he did so promptly, for, in less than a minute, and without the slightest premonition, the immense bank above them slid with a terrific rumbling noise into the river. The enormous mass of sand and vegetable detritus thus detached could not have been much, if at all, less than half a mile in extent.
M. Morlot presented me in 1857 with an unpublished map of Switzerland in which he had embodied the results of his own observations and those of MM. Guyot, Escher, and others, marking out by distinct colours the limits of the ice-transported detritus proper to each of the great river-basins.
But it was age that a tough vitality in the man resisted; as though the assault of time wore it down slowly and with almost an imperceptible detritus. The great naked head and the wide Mongolian face were unshrunken; they presented, rather, the aspect of some old child. He was dressed with extreme care, in the very best evening clothes that one could buy in a London shop.
This, roughly put, is the hydraulic method of mining which causes so much trouble between the agricultural and mining interests in California; for the finer detritus of this washing, called technically "slickens," fills up the rivers, causes them to overflow and deposit what is by no means a fertilising material on the pastures of the Golden State.
In this attitude, an idle spectator might have formed the impression that I was trying to wash my head and could not quite summon up resolution enough to plunge. In this odd pose I would remain for a long time, holding my breath and examining with extreme care every atom of rock, every swirl of detritus.
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