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Compiled in April 1987 by Mary Lynette Larsgaard and Alice Carlberger.
Revised and updated through 1993 by Rosalia Rooney.

This index, which is in alphabetical order by quadrangle name, area name, or county, is based on: McIntosh, Willard L. 1977. Geologic Map Index of Colorado by U.S. Geological Survey, and is updated by Bibliography and Index of Geology, 1976-April 1986. This is intended to be used as an adjunct to, not a replacement for, the aforementioned 1977 map index.

Indexing terms have been taken from the titles of the publications. This means that if county is not given in a map title, the map will not be indexed by county. The result is that some counties - especially those in the Denver metropolitan area - are underrepresented. The index terms, "northern" "souhtern" "eastern," and "western", are used only if there is no other possible index term.

Subjects included are geology, hydrogeology, structural geology, and mineral resources. Specifically excluded are geophysics, soils, land use, irrigation, and land ownership/leasing.

In some cases, plates or figures are specified by number, while in other cases they are not. This is due to the USGS index specifying such numbers, while the Bibliography and Index to Geology does not.

In all cases, a location abbreviation - such as "AR" (annual report) - for a generic type of publication is assumed to be USGS. If it is not USGS, the agency will be specified: "CGS AR 1st" would be the first annual report of the Colorado Geological Survey.

List of Abbreviations.
Thematic Maps of the entire state of Colorado.

Geological maps of Colorado in alphabetical order by quadrangle name, area name, or county:
[A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] [X] [Y] [Z]