Vol. 5] 



Mt i> iam-Sinclair. — Tertiary Faunas. 



177 



his whole .series, as I have determined by microscopic studies, 

 is of stratified traehytie pumice, tuffs and hyaline sands. The 

 Oregon Miocene is apparently the direct northward continuation 

 of the Nevada formation. Besides the parallelism between the 

 two series is the fact of an overlying unconformable Pliocene 

 in each case". It would seem from this reference to the Pliocene 

 that King possibly identified the Mascall or Rattlesnake with 

 the deposits in bis Shoshone Lake. On a later page 1 - the follow- 

 ing table was presented by King : 



King's correlation was adopted by Cope 13 in his later writ- 

 ings. In 1880 be published the following general account of 

 the geology of the John Day country : "The regions of the John 

 Day River and Blue Mountains furnish sections of the forma- 

 tions of central Oregon. Above the Loup Fork or Upper Mio- 

 cene there is a lava outflow, which has furnished the materials 

 of a later lacustrine formation, which contains many vegetable 

 remains. The material is coarse, and sometimes gravelly, and 

 it is found on the Columbia River and I think also in the interior 

 basin. Professor Condon, in bis unpublished notes, calls this 

 the Dalles Group. It is in turn overlaid by the beds of the 

 second great volcanic outflow. Below the Loup Fork follows 

 the Truekee Group, so rich in extinct mammalia, and below this 

 a formation of shales. These are composed of fine material, and 

 vary in color from a white to a pale brown and reddish-brown, 

 They contain vegetable remains in excellent preservation, and 

 undeterminable fishes. 



The Taxodium nearly resembles that from the shales at Osino, 

 Nevada, and on various grounds I suspect that these beds form 

 a part of the Amyzon Group (American Naturalist. June, 1880), 

 with the shales of Osino and of the South Park of Colorado. 



" King. Op. tit., p. 458. 



"Proe. Am. Phil. Soc, p. 61, 1880. 



MIOCENE. 



Province of Nevada 



and Oregon. 

 Pah-Ute Lake (Truekee Group, 



King ; John Day Group, 



Marsh). 



Sioux Lake (White River 

 Group, Hayden). 



Province of Great 

 Plains. 



