OF-00-04 Geologic Map of the Hesperus Quadrangle, La Plata and Montezuma Counties, Colorado

The Hesperus Quadrangle is located in La Plata and Montezuma Counties. Includes cross section, map unit correlation, shaded-relief map with geology overlay, booklet of extended descriptions of map units, geologic setting, geochemistry of igneous rocks, mineral and energy resources, and references. Specify standard map or full shaded relief map when placing an order. 33 pages. 1 color plate (1:24,000). OF-00-04

from the Geologic Setting:

The Hesperus quadrangle straddles a major regional structural boundary that separates the Four Corners platform from the San Juan dome in southwestern Colorado. The quadrangle is in the eastern part of the Four Corners platform, a broad, northeast-trending structural bench that extends from northwestern New Mexico into southwestern Colorado and is underlain by relatively flat-lying sedimentary rocks (Haynes and others, 1972; Woodward and others, 1997). The platform structurally separates several surrounding uplifts and basins in southwestern Colorado and northwestern New Mexico. Within the southwestern part of Hesperus quadrangle, rocks in the platform generally dip about 5 degrees southwest, south, or southeast.

Author: R.M. Kirkham
Status: Reprint
Year: 2000