182 



University of California Publications. 



[Geology 



W. D. Matthew 28 has suggested as probable an "overlap to some 



extent" of the Protoeeras beds on "the Lower Miocene John 



Day". "The Cottonwood basin, containing a higher fauna". 



is made "equivalent to the Deep River (Cope and Wortman) 



or Loup Fork (Scott)". In the correlation table published by 



Matthew 29 , the Diceratherium beds 30 of the John Day and a 



portion of the Promerycochoerus beds 30 are made the equivalent 



of Horizon C of the Colorado White River section, which is 



referred in part to the Oligocene and in part to the Lower 



Miocene. The Rattlesnake is spoken of as "the loose gravels 



overlying the Cottonwood beds" and is placed above the Loup 



Fork and referred to the Pliocene. In a later paper Matthew 31 



has called the Diceratherium beds Upper Oligocene and the 



Promerycochoerus beds Lower Miocene. The Mascall is placed 



in the Middle Miocene. As the latter reference is framed in 



accordance with the four-fold subdivision of the Tertiary, it is, 



perhaps, less discordant with Knowlton's 32 views regarding the 



Upper Miocene age of the Mascall than would at first appear. 



The following table of European and American ecpiivalents 



has been published by Osbom : 33 



( Upper Tortonien Loup Fork 



Miocene < Midi lie Helvetien Lower Loup Fork and 



{ Lower Langhien Upper John Day 



C Upper Aquitanjen Lower John Day (Di- 



Oligoeene ) ceratherium beds) 



\ Lower Tongrien { ?H m Pjp n . White River 



& ^ Intra- 1 ongrien 



28 A Provisional Classification of the Fresh-water Tertiary of the West. 

 Bull. Am. Mus. Nat. Hist., Vol. 12, Article 3. 

 ■ J Ibid., p. 23. 



30 See under heading: The John Day, Palaeontological classification. 



31 Notice of Two New Oligocene Camels. Bull. Am. Mus., Vol. 20, p. 

 214, 1904. 



32 Bulletin U. S. G. S., No. 204, p. 108. 



33 Correlation Between Tertiary Mammal Horizons of Europe and Amer- 

 ica, with Third Trial Sheet, Annals N. Y. Acad. Sci., Vol. 13, pp. 1-72, 1900. 



The Geological and Faunal Relations of Europe and America During 

 the Tertiary Period and the Theory of the Successive Invasions of an 

 African Fauna. Science, n. s., Vol. 11, p. 561, 1900. 



See also Osborn, Bull. Am. Mus. Vol. 23, pp. 237-253, 1907, issued 

 since the preparation of present article. The Lower John Day is placed 

 in the second phase of the Middle Oligocene, equivalent to the Leptauchenia 

 beds and Protoeeras sandstones. The Middle John Day is referred to the 

 Upper Oligocene, and is believed to be closely equivalent faunally to 

 the Aquitanien of France (St. Gerand-le-Puy) . The Upper John Day is re- 

 garded as transitional between Oligocene and Miocene. The Mascall is 

 placed in the earlier Miocene. The Rattlesnake is referred to the Lower and 

 Middle Pliocene. 



