MOOK, STUDY OF THE MORRISON FORMATION 191 



1914. 7. Cross, Whitman, and Larsen, E. S. : "Conti'ibutions to the sti'atig- 

 raphy of southwestern Colorado." U. S. Geol. Surv., Professional Paper 

 90-E, pp. 37-50, figs. 2, 3, pi. viii, 1914. [Description of McElmo formation 

 and discussion of geological history of region concerned.] 



1914. 8. Barnett, V. H. : "The Moorcroft oil field, Crook County, Wyoming." 

 U. S. Geol. Surv., Bull., No. 581-C, pp. 8.3-104, 1 fig., 1 plate (map), 1914. 

 [Separates only; bulletin not yet issued. Mar. 4, 1915.] [Section of the 

 Morrison formation in this locality, with brief description.] 



1914. 9. Barnett, V. H. : "Possibilities of oil in the Big Muddy Dome, Con- 

 verse and Natrona counties, Wyoming." U. S. Geol. Surv., Bull., No. 

 581-C, pp. 105-117, 1 plate (map). [Separates only; bulletin not yet 

 issued, Mar. 4, 1915.] [Note on the Morrison.] 



1914. 10. Cross, Whitman, and Larsen, Esper S. : "The stratigraphic break 

 below the Jurassic sandstone in southwestern Colorado." Abstract. Wash. 

 Acad. Sci., Journ., vol. iv, p. 237, 1914. [The Dakota does not overlap the 

 McElmo in Gunnison Canyon, as indicated by Peale's map of Colorado.] 



1915. 1. Berry, Edward W. : "Paleobotanic evidence of the age of the Mor- 

 rison formation." Geol. Soc. Amer., Bull., vol. xxvi, pp. 335-342, 1915 

 (read before the Paleontological Society December 30, 1914). [Discussion 

 of the floras of the Potomac, Wealden and Kootenie formations and the 

 relation of these to the Morrison. Favors Lower Cretaceous (Coman- 

 chean) age for the Morrison.] 



1915. 2. Lee, Willis T. : "Reasons for regarding the Morrison as an intro- 

 ductory Cretaceous formation." Geol. Soc. Amer., Bull., vol. xxvi, pp. 303- 

 314, 1915 (read before the Paleontological Society December 30, 1914). 

 [Diastrophic criteria applied to the study of the Morrison. Tlie formation 

 is considered as the non-marine forerunner of the marine Cretaceous de- 

 posits.] 



1915. 3. Lull, Richard S. : "Sauropoda and Stegosauria of the Morrison of 

 North America compared with those of Europe and eastern Africa." Geol. 

 Soc. Amer., Bull., vol. xxvi, pp. 323-334, 1915 (read before the Paleonto- 

 logical Society December 30, 1914). [The Morrison partly at least homo- 

 taxial with the Tendaguru dinosaur beds. The latter are not older than 

 uppermost Jurassic and probably are early Comanchean.] 



1915. 4. MooK, Charles C. : "Origin and distribution of the Morrison for- 

 mation." Geol. Soc. Amer., Bull., vol. xxvi, pp. 315-322, 4 figs., 1915 (read 

 before the Paleontological Society December 30, 1914). [The Morrison 

 the product of alternate deposition and erosion ; it may be both Jurassic 

 and Comanchean in different parts.] 



1915. 5. OsBORN, H. F. : "Close of Jurassic and opening of Cretaceous time 

 in North America." Geol. Soc. Amer., Bull., vol. xxvi, pp. 295-302, 1915 

 (read before the Paleontological Society, December .30. 1914). [Paleon- 

 tologic evidence considered as of greater value than diastrophic in corre- 

 lation; the Morrison probably both Jurassic and Lower Cretaceous.] 



1915. 6. Stanton, T. W. : "Invertebrate fauna of the Morrison formation." 

 Geol. Soc. Amer., Bull., vol. xxvi, pp. 343-348, 1915 (read before the Pale- 

 ontological Society December 30. 1914). [Evidence of the invertebrates is 

 not conclusive, but seems to indicate Jurassic age for the Morrison.] 



