Meek, F. B. & Hayden, F. V. (1861). Descriptions of new lower Silurian, (Primordial), Jurassic, Cretaceous, and Tertiary Fossils, collected in Nebraska, by the Exploring Expedition under the command of Capt. Wm. F. Raynolds, U. S. Top. Engrs.; with some remarks on the rocks from which they were obtained. Proceedings of the Academy of Natural Sciences of Philadelphia. 13: 415-447.
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Meek, F. B. & Hayden, F. V.
1861
Descriptions of new lower Silurian, (Primordial), Jurassic, Cretaceous, and Tertiary Fossils, collected in Nebraska, by the Exploring Expedition under the command of Capt. Wm. F. Raynolds, U. S. Top. Engrs.; with some remarks on the rocks from which they were obtained
Proceedings of the Academy of Natural Sciences of Philadelphia