Vol. 5] Merriam-Sinclair. — Tertiary Faunas. 173 



Age 



Section in the John Day Basin 



( 'orrelatives. 



Quaternary 



Terrace deposits with Equus 

 and Elephas remains. 



Later half of Quater- 

 nary. 



Erosion interval (tilting of 

 the Rattlesnake and erosion of 

 John Day Canon). 



Sierra n (?) 



Pliocene 



Rattlesnake formation (tuffs, 

 gravels, ashy soil, and rhyo- 

 litic lavas ) . 



Not Determined. 



Unconformity (tilting and ero- 

 sion of the Mascall). 



Miocene 



Later 

 Miocene 



Earlier 

 Miocene 



Pawnee Creek beds, Col- 

 orado ; Deep River beds, 

 Montana; Ellensberg 

 formation, Washington' 



Mascall formation (tuffs, ash- 

 es, and possibly gravels). 



Columbia Lava (basalt and 

 interstratified basaltic tuffs). 



Yakima Basalt, Ellens- 

 berg quadrangle, Wash- 

 ington. 



Harrison formation. 

 Monroe Creek formation. 

 Rosebud formation. 



Unconformity. Slight folding 

 of the John Day. Interval of 

 erosion. 



Olicocene 



John Day Series 



Upper John Day (mainly 

 buff-tinted tuffs. Sands 

 ami gravels near top). 





Middle John Day (drab 

 and bluish-green tuffs). 



Lower John Day (red, 

 white and green tuffaeeous 

 shales) . 



Unconformity. 



Eocene 



Clarno forma- 

 tion (shales, 

 tuffs, andesitic 

 and rhyolitic 

 lavas). T h e 

 Clarno has 

 y i e 1 d e d an 

 abundant flora 

 but no verte- 

 brate remains 

 have yet been 

 found. 



Upper Clarno 



beds. 

 (Upper 



Eocene). 



Payette formation, Ida- 

 ho. 4 



Manastash formation, 

 Washington.""' 



Lower Clarno 



beds. 

 (Lower 



Eocene). 



Unconformity. 



Cretaceous 

 (Marine) 



Chico formation (sandstones 

 and conglomerates). 



Basal Chico at Texas 

 Springs and near Horse- 

 town, California ; Phoe- 

 nix beds at '49 Mines, 

 Oregon." 



:i Knowlton, F. Fossil Flora of the John Day Basin. U. S. G. S. 

 Bulletin 204, pp. 109-110. 

 1 I hi, I. pp. 110-111. 



5 Smith, G. O. Professional paper U. S. G. S. No. 19, p. 10. 



o Stanton, T. W. Note in Bull. Dept. Geol. Univ. Cal. Vol. 2 p. 284. 



