26 CARBONIFEROUS FORMATIONS AND FAUNAS OF COLORADO. 



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1900. 



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Geological Survey, 20th Ann. Rept., pt. 2, pp. 31-63, pis. iii-vii, 1900. 

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States, folio 68, 1900. 

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.■jLbstract: Science, n. s., vol. 11, pp. 10.5-106, 1900. 



1901. 



Darton, N. H. Comparison of stratigraphy of the Blai^k Hills with that of the Front Range of 

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Comparison of stratigrajihy of the Black Hills with that of the Front Range of the Rocky 



Mountains. Abstract: Science, n. s., vol. 13, p. 1S8, 1901. 



RiGGS, Elmer S. The Dinosaur beds of the Grand River Valley of Colorado. Field Columbian Mus., 

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1902. 



Lee, W. T. The areal geology of the Castle Rock region, Colorado. Am. Geo!., vol. 29, pp. 96-109, 

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4, pp. 393-396, 1902. 



