1914] Merriam: Tertiary Mammals from Northeastern Nevada 281 



specimen seems less than in the Mohave form, and the posteroexternal 

 groove is less marked. In this respect the specimen seen in figure 3 

 agrees with the form from the Cedar Mountain beds, and probably 

 represents a similar type. It may tentatively be referred to Mery- 

 codus, and may represent M. furcatus, or a more primitive form. The 

 form represented in this specimen most nearly resembles types known 

 in the Upper Miocene. 



Camelid?, Various Forms 

 Several fragments of cheek-teeth represent indeterminate camels. 

 One is a large form, possibly Pliauchenia. 



Carnivore Remains 



The fragmentary distal end of a metapodial from the McKnight 

 locality probably represents a large cat, but may be canid. 



SUMMARY 



The McKnight locality in the valley of the North Fork of the 

 Humboldt River, Nevada, furnishes a mammalian fauna probably 

 representing a stage comprised within the latter half of the Miocene. 

 This fauna is near the stage of the Cedar Mountain and Mohave 

 faunas referred to the Upper Miocene. 



The McKnight locality is probably of the same stratigraphic stage 

 as the locality from which the Fortieth Parallel Survey obtained the 

 fauna furnishing the principal evidence of age for the large area 

 mapped as Pliocene by that survey. 



The deposits at the McKnight locality mapped as Pliocene by the 

 Fortieth Parallel Survey are not improbably near the age of the 

 Truckee beds, mapped as Miocene, in the western portion of the Great 

 Basin region. 



The Miocene of Nevada extends much farther to the east than the 

 easternmost limits heretofore recognized. 



Transmitted August S8, 1914. 



