. Annual report. 1st-12th, 1867-1878. can hardly be otherwise but that the present river channel is antecedentto the surrounding uplifts or structure, and that the basin alluded to hasbeen caused by erosion of comparatively more recent date. The latterquestion, however, pertains more to the duty of the geologist, who in thiscase has no doubt arrived at a similar conclusion. Near tbe junction of the Yampa and the Green River lies a small park-area, named Echo Park in previous explorations of this river by MajorPowell and leaving this park the stream, now called Green Eiver, soonenters a precipi
. Annual report. 1st-12th, 1867-1878. can hardly be otherwise but that the present river channel is antecedentto the surrounding uplifts or structure, and that the basin alluded to hasbeen caused by erosion of comparatively more recent date. The latterquestion, however, pertains more to the duty of the geologist, who in thiscase has no doubt arrived at a similar conclusion. Near tbe junction of the Yampa and the Green River lies a small park-area, named Echo Park in previous explorations of this river by MajorPowell and leaving this park the stream, now called Green Eiver, soonenters a precipitous canon and remains in it for 8 miles, passing afterwardthrough Island Park in large curves, after which it is again buriedbetween the huge canon cliffs of Split Mountain, within which thestream remains for 5 miles before if emerges, at last, into the WonsitsVallev. The height of the canon walls along Yampa River vary from1,000to 1,500 feet, and those of the Green River from 2,000 to 2,500 feet. Plate XXVI. ill/: A ,-- v~f/n, iff,.
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