w 



w 

 u 

 o 



w 

 u 

 o 



w 

 Z 

 w 

 u 

 o 



2 

 o 



Upper 



Middle 



Lower 



Upper 



Middle 



Lower 



Upper 



Middle 



ETCHEGOIN 



JACALITOS 



TEJON HILLS 



THOUSAND CREEK 



ORINDA 



Merychippus 



TEMBLOR 













<c 



CO 

 UJ 



UJ 



Q_ 



CO 



CHE 



UJ 





(0 





I 





H 



z 



_j 



<: 



ONO 



LIP'S R 





_i 





3= 





a_ 



BARSTOW 



JOHN DAY 



Pliohippus 



P.liohipph 



Hipparion 

 Pliohippus 

 Prolohipptis 



Merychippus 

 Hypohippus 



Parahippus 

 Archesohippus 



Parahippus 



Miohippus 



Mesohippus 



Fig. 12. Approximate Correlation op formations containing University of California types of Pacific 

 Coast and Great Basin Horses. By John C. Merriam, October, 1915. 



Geologic occurrence of type specimens or important figured 

 specimens of Pacific Coast and Great Basin Horses in the 

 University of California collections. 



Genus, Species, Locality. 



Distribution of Species of the Hipparion Group 

 in the Sonoran Region, West of the 

 Wasatch Range. 



Miocene to Pliocene 



Pliocene 



Hipparion gidleyi — Petaluma 

 Hipparion leptode — Thousand 

 Creek 



Hipparion molle — Jacalitos 

 Hipparion platy style — Orinda 

 Hipparion mohavense callo- 



donte — Ricardo 

 Hipparion mohavense — Ricardo 



Pliohip pus proversus — Etchegoin 

 Pliohippus coalingensis — Etchegoin 

 Pliohippus fairbanksi — Ricardo 

 Pliohippus tantalus — Ricardo 

 Protohippus tehonensis — Tejon Hills 



* MS 



Hipparion condoni — Ellensburg 

 Merychippus intermontanus — Barstow 

 Merychippus calamarius — Barstow 

 Merychippus sumani — Barstow 

 Hypohippus (Drymohippus) nevadensis — Esmeralda 

 Merychippus calif amicus — Temblor 

 Parahippus, near amis — Virgin Valley 

 Archmohippus ultimus — Mascall 



Miohippus acutidens — Upper John Day 



Hipparion sinclairi 

 Hipparion occidentale 

 Hipparion condoni 

 Hipparion mohavense 

 Hipparion mohavense cal- 



lodonte 

 Hipparion platystyle 

 Hipparion molle 

 Hipparion leptode 

 Hipparion gidleyi 



X 



X 



X 



X 



22 



