Rock units of the Precambrian basement in Colorado
By: by Ogden Tweto.
Series: U.S. Geological Survey professional paper ;; 1321-A
Publisher: U.S. G.P.O.
Published: 1987
Place of publication: Washington
Language: eng
Number of pages: 54
Subjects: Geology, Stratigraphic -- Precambrian; Geology -- Colorado
Notes: Bibliography: p. 47-54.
Fold. col. map in pocket.