. Elements of geology : a text-book for colleges and for the general reader. Geology. Fig. 8.—Lava-Stream cut through by Rivers: a a, Basalt; b b. Volcanic Ashes; c c, Tertiary; d d, Cretaceous Rocks. (From Whitney.) great canons through the lava and into the underlying rock, in some cases at least 2,000 feet deep. Such facts impress us with the immen- sity of geological times. This important point is discussed more fully in a subsequent part of this Fig. 9.—Buttes of the Cross (Powell). But nowhere in this country, or in the world, are the phenomena of canons exhibited on so grand a sc
. Elements of geology : a text-book for colleges and for the general reader. Geology. Fig. 8.—Lava-Stream cut through by Rivers: a a, Basalt; b b. Volcanic Ashes; c c, Tertiary; d d, Cretaceous Rocks. (From Whitney.) great canons through the lava and into the underlying rock, in some cases at least 2,000 feet deep. Such facts impress us with the immen- sity of geological times. This important point is discussed more fully in a subsequent part of this Fig. 9.—Buttes of the Cross (Powell). But nowhere in this country, or in the world, are the phenomena of canons exhibited on so grand a scale, and nowhere are they so obviously the result of pure erosion, as in the region of the Grand Plateau of Utah, Arizona, New Mexico, and Colorado. This plateau is elevated 7,000 to 8,000 feet above the sea, and composed entirely of nearly hori- zontal strata, comprising nearly the whole geological series from the Tertiary downward. Through this series all the streams have cut their. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original LeConte, Joseph, 1823-1901. New York : D. Appleton and Co.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectgeology, bookyear1892
