File:Preliminary report of the United States Geological Survey of Wyoming, and portions of contiguous territories - (being a second annual report of progress), under the authority of the Secretary of the (14781492532).jpg

Identifier: preliminaryrepor1871geol (find matches)
Title: Preliminary report of the United States Geological Survey of Wyoming, and portions of contiguous territories : (being a second annual report of progress), under the authority of the Secretary of the Interior
Year: 1871 (1870s)
Authors: Geological and Geographical Survey of the Territories (U.S.) Hayden, F. V. (Ferdinand Vandeveer), 1829-1887 Thomas, Cyrus, 1825-1910
Subjects: Geology Geology
Publisher: Washington : Govt. Print Off.
Contributing Library: Harold B. Lee Library
Digitizing Sponsor: Brigham Young University

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al names, but they have been found by experience to serve our 88 GEOLOGICAL SURVEY OF THE TERRITORIES. purpose best. In Nebraska the sandstones of the Dakota Group restdirectly upon rocks of the age of the coal measures. Although they donot appear in full force until we reach a point near De Soto and beyond,yet remnants of the sandstones make tteir appearance within hve orten miles of Omaha at any point north of the Platte River. It is quiteprobable that they once extended all over Nebraska, passing across intoIowa, and how much further eastward we have not definite data to de-termine. The coal-measure limestones are thus exposed in northeasternNebraska by the erosion of the cretaceous rocks. This is a very import-ant matter in a practical point of view, for the sandstones of the cretace-ous group are seldom of much value for building purposes, and the ex-posure of large areas of the carboniferous rocks in the most fertile por-tions of the State is a fact of inestimable value. Fig. X.
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Chalk Bluffs, Cretaceous No. 1, near Blackbird Hill, Nebraska. Along the banks of the Missouri Eiver, on the Indian Eeserve, is alofty escarpment of yellow, rotten, coarse-grained sandstone, sometimescalled Chalk Bluffs, from their whitish chalky appearance in the dis-tance. They are from one hundred to one hundred and fifty feet inheight, and about half way up, or at least fifty feet above the water, andas much from the top of this perpendicular wall, are carved out numer-ous Indian hieroglyphics, as pipes, canoes, various kinds of animals, ruderepresentations of the Indians themselves, &c. Tlie question at oncearises, who carved them here? The Indians now living cannot accountfor them, and call the rocks Medicine, a term which they apply toall things that are mysterious to them. The characters closely resembletliose on their robes worn at the present day, and are doubtless emblem-atical of some important event in Indian history. These figures musthave been carved here many centupreliminaryrepor1871geol

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