Marsh, Othniel C., Emmons, Samuel Franklin., Knowlton, F. H., et.al.; Geology of the Denver Basin. USGS Monograph 27, 1896. Quarto, pp. xxi, 556, 31 plates and folded maps, 102 figures.

The work is complete and in the original brown cloth with gilt titles. The binding is tight with light scuffing and institute stamp on lower spine. Mining institute book plate on paste down and stamp on half title. Very minor coal smoke on text block margins. The text, maps and plates are very clean. In very good condition.

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A monumental work covering the geology, topography, economic geology and paleontology of the Denver Basin region along the Colorado Front Range. Knowlton provides a systematic description the paleobotany and Marsh describes the well known dinosaur and mammal fossil localities. The work is sought after for Marsh’s contribution to the vertebrate paleontology.