3I00K, STUDY OF THE MORRISON FORMATION 181 



1900. 7. Hills, R. 0. : Walsenberg, Colorado, quadrangle. U. S. Geol. Surv., 

 Geol. Atlas, Folio No. 68, 6 pp., 3 figs., 6 maps, 2 section sheets, 1900. 

 [Description of the Morrison formation. It varies from 100 to 270 feet.] 



1900. 8. Ward, L. F. (with the collaboration of Wm. Fontaine, Atreus Wan- 

 ner and F. H. Knowlton) : "Status of the Mesozoic floras of the United 

 States. First paper : Older Mesozoic." U. S. Geol. Surv., 20th Ann. Hep., 

 pt. 2, pp. 211-430, pis. 21-179, 1900. [Description of the occurrence and 

 character of the strata and plant remains of the Trias and Jura at differ- 

 ent localities in the United States and the characters of the genera and 

 species.] 



1900. 9. Davis, W. M. : "The fresh-vs^ater Tertiary formations of the Rocky 

 Mountain region." Amer. Acad. Arts and Sci., Proc, vol. xxxv, pp. 345- 

 373, 1900. [Discussion of flood-plain deposits and short description of 

 Hoangho and Indo-Gangetic flood-plains.] 



1900. 10. Logan, W. N. : "A North American epicontinental sea of Jurassic 

 age." Journ. Geol., vol. viii, p. 241, 4 figs., 1900. [Section of the Morrison 

 and Sundance formations, map of distribution of the Sundance, summary 

 of sequence of events concerning the advance and retreat of the Sundance 

 sea.] 



1901. 1. Dabton, N. H. : "Preliminary description of the geology and water 

 resources of the Black Hills and adjacent regions in Soutli Dakota and 

 Wyoming." U. S. Geol. Surv., 21st Ann. Rep., pt. 4, pp. 497-599, 55 pis., 

 28 figs., 1901. [Sections, descriptions, etc. ; Beulah shales equal the Mor- 

 rison.] 



1901. 2. Daeton, N. H. : "Comparison of the stratigraphy of the Black Hills 

 with that of the Rocky Mountain front range." Geol. Soc. Amer., Bull., 

 vol. xii, p. 478, 1901. [General comparison, Morrison included.] 



1901. 3. WiLLisTON, S. W. : "The Dinosaurian genus Creosaurus Marsh." 

 Amer. Journ. Sci., 4th ser., vol. xi, pp. 111-114, 1 fig., 1901. [Name "Atlan- 

 tosaurus Beds" replaced by "Como."] 



1901. 4. RiGGS, Elmer S. : "The dinosaur beds of the Grand River Valley of 

 Colorado." Field Col. Mus. Pub. 60, Geol. Ser., vol. i, no. 9, pp. 267-275, 

 6 pis., 1901. [General section and description of beds. They were de- 

 posited by a combination of stream and lake deposition.] 



1901. 5. Hatcher, J. B. : "The Jurassic dinosaur deposits near Caiion City, 

 Colorado." Carn. Mus., Ann., vol. i, pp. 327-341, 5 figs., 1901. [Descrip- 

 tion of section, discussion of origin and correlation.] 



1901. 6. LooMis, F. B. : "On Jurassic stratigraphy in southeastern Wyo- 

 ming." Amer. Mus. Nat. Hist., Bull., vol. xiv, pp. 189-198, 2 pis., 1901. 

 [Detailed sections and descriptions of the Morrison^ at Como Bluff and 

 near-by localities.] 



1901. 7. Lee, W. T. : "The Morrison formation of southeastern Colorado." 

 Journ. Geol., vol. ix, pp. 343-352, 4 figs., 1901. [Detailed section and dis- 

 cussion of correlation of the beds in the canyons in southeastern Colo- 

 rado.] 



1901. 8. Darton, N. H., and Keith, A. : "Washington, Maryland- Virginia- 

 District of Columbia, quadrangle." U. S. Geol. Surv., Geol. Atlas, Folio 

 No. 70, 7 pp., 8 maps, 1901. [Notes on the Potomac beds.] 



1902. 1. Daeton, N. H. : "Norfolk, Virginia-North Carolina, quadrangle." 

 U. S. Geol. Surv., Geol. Atlas, Folio No. 80, 4 pp., 4 maps, section sheet. 



