Description of the Castle Rock Quadrangle
DESCRIPTION OF THE CASTLE ROCK QUADRANGLE, By Cr. B. Richardson. INTRODUCTION. Wyoming, Montana, Idaho, and Canada, and a southern divi The general structure of the Rocky Mountain province is sion comprising the ranges of southern Wyoming, Colorado, characterized by an anticlinal arrangement of the stratified POSITION AND RELATIONS OF THE QUADRANGLE. and northern New Mexico. The southern division of the rocks about the main ranges as axes, but this arrangement is The Castle Rock quadrangle, which includes parts of Rocky Mountains is composed of a group of ranges of general modified by extensive faulting. The major system of faults Douglas, El Paso, and Elbert counties, Colo., is in the central north to northwest trend, between certain of which lie wide is longitudinal, trending north and south, and most of the part of the State, between Denver and Colorado Springs. It valleys known as "parks." dislocations are normal. is bounded by meridians 104° 30' and 105° and parallels 39° In Colorado the main subdivisions of the Rocky Mountains The Colorado or Front Range, together with its northern comprise the features shown in figure 2. The Colorado or continuation, the Laramie Mountains in Wyoming, forms the 106° 105° 104° 1O3° Front Range rises abruptly above the plains and extends from eastern Cordilleran front for about 250 miles, terminating on the northern boundary of the State to Arkansas River. South the south in the great mass of Pikes Peak. Viewed from the of Arkansas River the mountain front is formed by two ranges, east, the Front Range presents an imposing spectacle, towering Wet Mountain and that part of the Sangre de Cristo Range above the plains in an abrupt escarpment.
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