Geologic Map of the Clifton Quadrangle, Mesa County, Colorado

The landslide developed in the Mancos Shale and contains large blocks of the overlying Mesaverde Group. In addition, the landslide is a source of debris flows that have closed I-70 in the past. The major bedrock unit in the quadrangle is the Mancos Shale of Upper Cretaceous age.

The map is accompanied by text containing unit descriptions, and sections on geologic hazards (including landslides, piping, gullying, expansive soils, and flooding), and economic geology (including sand and gravel). A table indicates what map units are susceptible to a given hazard. Approximately 20 references are cited at the end of the report.

Map political location: Mesa County, Colorado Compilation scale: 1:24,000 Geology mapped in 1996 to 1998. Compilation completed March 1999. DATASETS INCLUDED IN THIS GEOSPATIAL DATABASE: > clifpoly: geology polygons, contacts, and other linear features > clifline: line of cross-section A-A' > clifpnt: point features - bedding attitudes, drillholes