Geologic map of Colorado - Tweto, Ogden 1912-1983; Schoenfeld, R. E
Incluye en la segunda hoja Explanation: Unconsolidated superficial depositis and rocks of queternary age; Unconsolidated deosists of quaternary and late tertiary age; Sedimentary rocks of tertiary age; Igneous rocks of tertiary age; etc.
Incluye en la segunda hoja: Symbols ; References.
"Based from U.S. Geological Survey, 1969. Lambert conformal conic projection based on standart parallels 33° and 45°"