. Water Supply and Irrigation Papers of the United States Geological Survey . WATER-SUPPLY PAPER PL. II 30 GENERAL GEOLOGIC MAP OF THE REGION ALONG THE NORTH PLATTE RIVER NEAR THE WYOMING NEBRASKA LINEBY GEORGE W f Us C4 5 O Scale 5 10 L5 MILES LEGE M) TERTIARY I , Ogallala Arikan CRETACEOl e,incs udingGering CARBONIFEROUS 1 1 Jrule Chadron IGNEOUS AND METAMORPHIC. 2 JULIUS BIEN & 16 PATRICK AND GOSHEN HOLE QUADRANGLES. [no. 70. number of low points which are capped by remnants of these sand-stones. The most conspicuous among them for its altitude is Red BillPoint, althou
. Water Supply and Irrigation Papers of the United States Geological Survey . WATER-SUPPLY PAPER PL. II 30 GENERAL GEOLOGIC MAP OF THE REGION ALONG THE NORTH PLATTE RIVER NEAR THE WYOMING NEBRASKA LINEBY GEORGE W f Us C4 5 O Scale 5 10 L5 MILES LEGE M) TERTIARY I , Ogallala Arikan CRETACEOl e,incs udingGering CARBONIFEROUS 1 1 Jrule Chadron IGNEOUS AND METAMORPHIC. 2 JULIUS BIEN & 16 PATRICK AND GOSHEN HOLE QUADRANGLES. [no. 70. number of low points which are capped by remnants of these sand-stones. The most conspicuous among them for its altitude is Red BillPoint, although there are a number of ridges of greater extent. Alongthe Platte River, in the absence of better building stone, these bedshave been quarried where they are of fairly uniform texture, andsupply a durable stone, although it is difficult to work. This forma-tion appears to have been limited southward by a Cretaceous ridge,outcrops of which are seen in the southern part of Goshen Hole. Thearea of Chadron shown on the map is confined wholly to the northslope of this ridge, if such it be, and south of it the formation evi-dently is absent. Brule formation.—Succeeding the Chadron beds and lying uncon-formably upon them, or in their absence upon the Cretaceous, is athick mass of clay which has very uniformly a pinkish or flesh-coloredtint, except at some localities of l
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