B-23 Some Anticlines of Routt County, Colorado


Some anticlines of Routt County, Colorado. 3 plates (1:25,000 and 1:31,680). 10 figures. Digital PDF download. B-23D.

Excerpt from the Introduction:

Oil seeps in Routt County have long been known, and two or three test wells were drilled many years ago. In the summer of 1919 a party of the Colorado Geological Survey studied the local geologic features that might have a bearing on oil formation and accumulation. … [T]he present report is being published in the hope that it will be of use to operators in 1920.

Routt County is drained by Yampa River and its tributaries of which the largest is Elk River. Along these and other streams alluvial flats furnish fertile soil for the heavy crops of hay and oats that are grown on numerous ranches, or farms. Productive soil overlies the Mancos and Lewis shale of the parks and valleys, and much of it is under cultivation.

This report provided the first detailed geologic investigation of the area. It is organized as follows: Introduction; Sedimentary rocks and surficial deposits; Folds; Tow Creed anticline (northern part); and Anticlines near Steamboat Springs. The latter two sections present the physiography, stratigraphy, and structure of the anticlines.