Report on the Geology of the High Plateaus of Utah, 1880: With Atlas. E-book. Formato PDF Clarence E. Dutton   -  Forgotten Books, 2017  - 

The Colorado Plateaus extend from southern Wyoming through western Colorado and eastern Utah far into New Mexico and Arizona. They are bounded on the north by the Wind River and Sweetwater Mountains, on the east by the Park Mountains, on the south by the Desert Range Region, and on the west by the Basin Range Region.The Plateaus are chiefly drained by the Colorado River, but a small area on the northwest is drained into Shoshone River, another on the northeast into the Platte River, still another on the southeast into the Rio Grande del Norte, and finally the western margin is drained by the upper portions of the Sevier, Provo, Ogden, Weber, and Bear Rivers. The general elevation is about 7,000 feet above the level of the sea - varying from 5,000 to 12,000 feet. The ascent from the low, desert plains on the south is very abrupt - in many places by a steep and almost impassable escarpment. In the Plateau Province an extensive series of sedimentary formations appear, embracing Paleozoic, Mesozoic, and Tertiary strata, but crystalline schists and granites are found in some of the deep canons.A marked unconformity exists between the Silurian and Devonian rocks; another between the Devonian and Carboniferous; another, but not so well marked, between the Carboniferous and Mesozoic, and lastly an unconformity between Cretaceous and Tertiary is usually well defined. The Plateaus have been above the sea since the close of the Cretaceous period but during early Tertiary times extensive lakes existed throughout the Province.

Tertiary History of the Grand Cañon District: With Atlas. E-book. Formato PDF Clarence Edward Dutton   -  Forgotten Books, 2017  - 

I have in many places departed from the severe ascetic style which has become conventional in scientific monographs. Perhaps no apology is called for. Under ordinary circumstances the ascetic discipline is necessary. Give the imagination an inch and it is apt to take an ell, and the funda mental requirement of scientific method — accuracy of statement — is im periled. But. In the Grand Canon district there is no such danger. The stimulants which are demoralizing elsewhere are necessary here to exalt the mind sufficiently to comprehend the sublimity of the subjects. Their sublimity has in fact been hitherto underrated. Great as is the fame of the Grand Canon of the Colorado, the half remains to be told.