Decriptions of the New Organic Remains collected in Nebraska Territory int he year 1857, by Dr. F. V. Hayden, Geologist to the Exploring Expedition under the command of Lieut. G. K. Warren, Top. Engr. U.S. Army, together with some remarks on the Geology of the Black Hills and portions of the surrounding Countryv. 10Academy of Natural Sciences41–59
Meek, F. B. and Hayden, F. V. 1858. "Decriptions of the New Organic Remains collected in Nebraska Territory int he year 1857, by Dr. F. V. Hayden, Geologist to the Exploring Expedition under the command of Lieut. G. K. Warren, Top. Engr. U.S. Army, together with some remarks on the Geology of the Black Hills and portions of the surrounding Country." Proceedings of the Academy of Natural Sciences of Philadelphia, 10 41–59.