Includes cross section, booklet of extended descriptions of map units, economic geology, and references of the Rules Hill Quadrangle, La Plata County. 12 pages. 1 plate (1:24,000). Superseded by OF-14-11. Digital PDF Download. OF-97-01D
From the authors notes:
Geologic mapping of the 7.5-minute Rules Hill quadrangle was undertaken by the Colorado Geological Survey as part of the National Cooperative Geologic Mapping Act-STATEMAP component program. The Rules Hill quadrangle was selected as the first quadrangle to be mapped in the Durango area because of the rapid population growth, geologic hazards such as methane seepage and natural gas resources found within it.