This is the complete Volume III (Supplement - Geology) of Wheeler's Survey dated 1881. This scarce volume contains the first detailed mapping of the region from Trinidad, Colorado to Los Alamos, New Mexico. Included are three maps with both topographical and geological information: Parts of Southern Colorado and Northern New Mexico, No. 70A; Part of North Central New Mexico, No. 70C; Parts of Atlas Sheets No. 69B, 69D, 77B and 78A. Each of the maps shows different geologic formations in vibrant color that are overlaid on top of relief shown in hachure. In addition to the maps are 4 plates showing geology and fossils along with an accompanying 420-page report (10 x 12"). Hardbound in original brown cloth and gilt title on spine.

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Condition: B+

Maps are brightly colored with just a hint of toning along one fold. Text is clean with light toning along sheet edges. Hinges are starting with the back cover nearly detached. Covers and spine show moderate shelf wear.