A very early, uncommon map of Colorado, with no counties delineated, although the first counties were established in 1861. The Base Line is prominently delineated with surveyed areas limited to a narrow band in the center of the map that includes Denver. The route of General Winkoop in his 1863 pursuit of the Ute Indians is noted in the western part of the territory. Mountain elevation is delineated through hachure. The map is signed in the plate by John Pince, Surveyor General.

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Condition: B+

With folds as issued, with some light toning and a few fold intersections repaired on the verso with archival tape. There are some short tears on the left binding side, one just into the neatline.