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Cockerell, T. D. A. 



1906. The Fossil Mollusca of Florissant Colorado. Bull. Amer. Mus. Nat. 



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1908. The Miocene Species of Lymnsea. Nautilus XXII, p. 96, 1908. 

 Conrad, T. A. 



1866. Check List of the Invertebrate Fossils of North America. Eocene 



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 Cooper, J. G. 



1894. On some Pliocene Fresh-Water Fossils of California. Proc. Cal. 



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1894. Descriptions and Figures of New Species of Cretaceous and Cre- 

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1905. Land and Fresh-Water Mollusks. Harriman Alaska Expedition, 

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Dall, W. H. and Harris, G. D. 



1892. Correlation Papers. Neocene. Bull. U. S. Geol. Surv., No. 84 (p. 



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1908. Paleozoic and Mesozoic of Central Wyoming. Bull. Geol. Soc. Amer., 

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Darton, N. H. and Siebenthal, C. E. 



1909. Geology and Mineral Resources of the Laramie Basin, Wyoming. 

 Bull. U. S. Geol. Surv., p. 364, 1909. 



Davis, W. M. 



1900. The Fresh-Water Tertiary Formations of the Rocky Mountain 

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 Dawson, George Mercer. 



1875. Report on the Geology and Resources of the Region in the Vicinity of 

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Engelmann, Henry. 



1876. Report on the Geology of the Country between Fort Leavenworth, 

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Evans, John and Shumard, B. F. 



1854. Descriptions of New Fossil Species from the Fresh-Water Tertiary 

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1883. Manuel de Conchiliologie, Paris. 

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1903. Text-Book of Geology, Volume II, Fourth Edition. London. 



