. Sixth annual report of the United States geological survey of the Territories, embracing portions of Montana, Idaho, Wyoming, and Utah : being a report of progress of the explorations for the year 1872. ard toward the divide. Great masses of snow and ice accumulatein them during the winter, and the water, flowing down among the frac-tured masses, freeze--, and expands with a lorce that year by year tearsdown a portion, that falls into the depths below and is swept down bythe torrent. The aggregate of the forces which have continued inoperation through a series of ages, which no man can deter
. Sixth annual report of the United States geological survey of the Territories, embracing portions of Montana, Idaho, Wyoming, and Utah : being a report of progress of the explorations for the year 1872. ard toward the divide. Great masses of snow and ice accumulatein them during the winter, and the water, flowing down among the frac-tured masses, freeze--, and expands with a lorce that year by year tearsdown a portion, that falls into the depths below and is swept down bythe torrent. The aggregate of the forces which have continued inoperation through a series of ages, which no man can determine now,and which we agree to denominate meteoric or atmospheric, are thecombined action of water, air, and ice. These forces have undoubtedlybeen far more effective in ages past than at present. In one of thegorges which lead down to the river in the caiion, we discovered acomplete inversion of the strata, and this condition of things wasfound afterward to prevail to a large extent in these would refer the reader to Dr. Peales report, and also to the descrip- ^o -vHSiLle outlet knoAvntu tliiii Lake. General descent towardMadison Valley, terraced andintervened with Ravines. GEOLOGICAL SURVEY OF THE TERRITORIES. 61 tion of the Gallatiu range iu a subsequent chapter, where other exam-ples of inversion of strata will be noticed. About ten miles northwest of Lake Henry, below the Middle Canon, asmall stream, which has its origin in the Rayuolds Pass, flows into Cliffor Wades Lake. The little stream has cut a singular gorge through thetrachyte-rocks, with vertical walls 400 to GOO feet high, runs southwestabout two miles, turns abruptly south around a point of trachyte 000 feethigh, and continues nearly west. This lake, w^hich has not been noticedon any of the existing maps, is said to have no outlet, [t seems to beformed in a huge fissure in the volcanic rocks, and is surrounded bylofty nearly vertical walls. This lake was carefully explored by Mr. Bechler,
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