. Annual report. 1st-12th, 1867-1878. holmes.] CLIFF-HOUSES, RIO MANCOS. 391 CANON OF THE RIO MANCOS. Fifteen miles from its junction with the San Juan, this stream emergesfrom the southwest border of the Mesa Verde, through which it has cutits way, producing a most remarkable canon. This canon has alreadybeen once or twice described; but, in order to make my subsequentdescriptions better understood, I shall give here an outline. The MesaVerde is a somewhat irregular table-land, comprising an area of aboutseven hundred square miles, and is formed of a great series of nearlyhorizontal sedimenta
. Annual report. 1st-12th, 1867-1878. holmes.] CLIFF-HOUSES, RIO MANCOS. 391 CANON OF THE RIO MANCOS. Fifteen miles from its junction with the San Juan, this stream emergesfrom the southwest border of the Mesa Verde, through which it has cutits way, producing a most remarkable canon. This canon has alreadybeen once or twice described; but, in order to make my subsequentdescriptions better understood, I shall give here an outline. The MesaVerde is a somewhat irregular table-land, comprising an area of aboutseven hundred square miles, and is formed of a great series of nearlyhorizontal sedimentary rocks, of which the surrounding country hasbeen denuded. This series of strata consists, in the upper part, ofmassive sandstones; in the middle part, of alternating sandstones ; and in the lower one thousand feet, chiefly of shales and softer beds are, when once exposed to the erosive agents, carriedaway with great rapidity, and, as a consequence, the firmer rocks aboveare undermined and break down in vertical
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