11. REPORT UPON THE MATERIAL DISCOVERED IN 



THE UPPER EOCENE OF THE UINTA BASIN BY 



EARL DOUGLAS IN THE YEARS 1908-1909, 



AND BY O. A. PETERSON IN 1912. 



By O. a. Peterson. 



Introduction. 



The present report may be considered as the continuation of the 

 work done by Messrs. Earl Douglass, O. A. Peterson, and C. W. 

 Gilmore who have already written upon the Titanotheroidea and the 

 turtles, and incidentally have briefly discussed the geology of the 

 Uinta Basin. ^ A more complete and detailed account of the geology 

 of the Uinta Tertiary is deferred pending a further and more complete 

 study in the near future. The collection of fossil insects and plants 

 will also be taken up in later publications. 



The illustrations are from drawings made by Mr. Sydney C. Pren- 

 tice. 



I. FISHES AND REPTILES OF THE UINTA EOCENE. 



(The Turtles belonging to the collections made by Mr. Earl Douglas 

 and the author of this paper have received full treatment by Mr. 

 C. W. Gilmore in his paper, entitled "The Fossil Turtles of the 

 Uinta Formation," Memoirs Carn. Mus., VII, 1915, pp. 101-161.) 



II. PISCES. 



Above the typical Green River Shales of the Uinta Basin remains of 

 fishes, such as the scales of gars and isolated bones, are often found in 

 different localities and horizons. These remains are generally dis- 

 covered in heavy bedded sandstones of stream origin and are very 



^ Douglass, Earl, "Preliminary Description of Some New Titanotheres from the 

 Uinta Deposits," Ann. Car. Mus., Vol. VI, 1909, pp. 304-311; "Geology of the 

 Uinta Formation," Bull. Geol. Surv. of America, Vol. XXV, 1914, pp. 417-420. 

 Peterson, O. A., "A New Titanothere from the Uinta Eocene," Ann. Car. Mus., 

 Vol. IX, 1914, pp. 29-52; "A Small Titanothere from the Lower Uinta Beds," 

 I.e., pp. 53-57; "Some Undescribed Remains of the Uinta Titanothere Dolicho- 

 rhinus," I.e., pp. 129-138. Gilmore, C. W., "The Fossil Turtles of the Uinta 

 Formation," Mem. Car. Mus., Vol. VII, No. 2, 1915, pp. 101-161. 



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