Report of the Exploring Expedition from Santa Fe, New Mexico, to the Junction of the Grand and Green Rivers of the Great Colorado of the West: in 1859 under the Command of Capt. J. N. Macomb, Corps of Topograpphical Engineers with Geological Report by Prof. J.S. Newberry

Excellent condition, but missing the original map that was originally included. 11 fine chromolithographic and 11 lithographic plates. Publication of this report was originally intended for 1861, but the Civil War intervened and prevented publication for another fifteen years. The expedition under Macomb went west from Santa Fe across northern New Mexico and Arizona to the Colorado. The whole drainage of the San Juan had been traced and the relationship of that river with the Colorado clearly established. More important, they had also established that the Green River united with the Grand to form the Colorado. The entire maze of intricate canyon country had been threaded, and its geography revealed for the first time. In addition, Newberry was able to establish numerous stratigraphic columns, and to trace the Triassic, Jurassic, and Carboniferous strata far out across the Colorado River. Newberry.introduced a new level of sophistication into the study of western geology.