May 26th; Notes Explanatory of a Map and Section Illustrating the Geological Structure of the Country Bordering on the Missouri River, from the Mouth of the Platte River to Fort Benton, in lat. 47° 30′ N., Long. 110° 30′ W.; Descriptions of New Species and Genera of Fossils, Collected by Dr. F. V. Hayden in Nebraska Territory, under the Direction of Lieut, G. K. Warren, U. S. Topographical Engineer; With Some Remarks on the Tertiary and Cretaceous Formations of the North-West, and the Parallelism of the Latter with Those of Other Portions of the United States and Territories

F. V. Hayden, F. B. Meek and J. P. Kirtland

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