1915 j Merriam: Land Mammals from Tejon Hills 285 



Tertiary formations of the San Joaquin Valley can be made. It is 

 possible that faunas representing both the "Santa Margarita" and 

 "Temblor" stages are present in the Tejon Hills area. 



The mammalian collections obtained in the Tejon Hills consist of 

 very fragmentary material including a small number of teeth and 

 limb-bones. The forms represented are the following : 



Merychippus, sp. Bhinocerotid? remains. 



Hipparion or Merychippus, sp. Isurus, near planus (Agassiz) 



Meryeodus, sp. 



The horse remains from the lower beds are near the stage of 

 evolution of Merychippus-like forms of the Barstow fauna in the 

 Mohave Desert immediately to the east. They are less advanced than 

 any available forms of the Rieardo fauna representing the next faunal 

 stage following the Barstow in the known mammalian succession of 

 the region west of the Wasatch. An equid form from Tejon Creek is 

 near Hipparion and may represent a second fauna. The antelope- 

 like Meryeodus bones are scarcely to be distinguished from correspond- 

 ing elements of Meryeodus necatus of the Barstow fauna. The 

 phalanges may be slightly more slender than in the average M. necatus 

 from the Barstow fauna. A Rieardo species has characters near those 

 of the Barstow type, and is also not clearly separable from the Tejon 

 Hills form. 



So far as can be determined from the material available, the Tejon 

 Hills collection represents one or more stages not younger than the 

 earliest Pliocene and not older than the Middle Miocene fauna of 

 the Merychippus zone of the "Temblor." beds in the North Coalinga 

 region on the western border of the San Joaquin Valley. 



Description op Material 



PKOTOHIPPINE FOEMS 



A specimen (fig. 1 ) obtained by Mr. Pack from the west side 

 of Comanche Creek one-half mile east of Signal Hill is a slightly 

 curved, well-cemented tooth which has suffered some wear. The con- 

 nection of the fossettes at the adjoining borders indicates that the 

 stage of wear is not advanced. The protocone is discrete and shows 

 no suggestion of connection with the protoconule. The fossettes are 

 not especially wide transversely, and their enamel borders are rela- 

 tively simple. This tooth resembles the Hipparion group in the char- 



