Vol. 5] 



Merriam-Sinclair. — Tertiary Faunas. 



179 



The term Truckee was later abandoned by him in favor of 

 Marsh's John Day. The change in nomenclature appears in a 

 note on the vertebrate fauna of the Ticholeptns beds published 

 in 1886 17 . 



"In the Report of the U. S. Geological Survey of the Terrs., 

 Vol. III. p. 18 (1884), I have given some of the characters of 

 this horizon" (i. e.. the Ticholeptns beds) "and its fauna. It 

 is intermediate in all respects between the Middle and Upper 

 Miocene formations of the West, as represented by the John Day 

 and Loup Fork beds. It was first explored in the valley of Deep 

 River, Montana, by my assistant, J. C. Isaac, and afterwards by 

 J. L. Wortman on the Cottonwood Creek, Oregon. At the latter 

 locality it is seen to rest on the John Day beds, as stated by Mr. 

 Wortman, and is indicated by the collections made by him." The 

 statement regarding the superposition of the so-called Ticholep- 

 tns beds on the John Day should probably be read as "above" 

 rather than "on the John Day". This formation has been 

 termed the Cottonwood beds 18 , Loup Fork beds, Amyzon beds 10 

 and Protolabis beds 20 . In Oregon it is now known as the Mascall 

 formation. 



Cope's correlation of the Mascall with the Montana Deep 

 River is rejected by Scott 21 , as follows: "I cannot agree with 

 Cope in regarding the strata of western Nebrasca and Cotton- 

 wood Creek, Oregon, as referable to the same horizon as those 

 of the Deep River valley in Montana. . . . The reference of 

 the beds developed along Cottonwood Creek and the upper John 

 Day River, in Oregon, to the Deep River horizon, is determined 

 by the occurrence in them of a so-called Anchitherium and of a 

 species identified as Blastomeryx horealis. It should be noted, 

 however, that the term Anchitherium is used in the sense of 

 Miohippus, the species from Montana which I have called 

 A. equinum is a very different animal and belongs to the group 

 of A. aurelianense, of Europe, which it equals in size. Miohippus 



" Am. Nat., Vol. 20, pp. 367-368, 1886. 



"Bull. Am. Museum of Nat. Hist., Vol. 12, p. 23; also Jour, of Geol , 

 Vol. 9, p. 72. 



"Cope. Proc. Am. Phil. Soc, 1880, Vol. 19, p. 61. 



-"Wortman. Bull. Am. Mus. Nat. Hist., Vol. 10, pp. 120, 141. 



21 The Mammalia of the Deep River Beds. Trans. Am. Phil Soc, Vol. 17, 

 p. 60, 1893. 



