20 



osborn: OLIGOCENE, MIOCENE, pliocene eqtjid.e. 



Clarendon Beds, Llano Estacado, Texas, Gidley, 1903. 



Including Palo Duro Canon, Mulberry Canon, localities of Cummins and of Cope. 



These beds contain Procamchts, Pliauchenia, Trilophodon productus, ? Teleoccras, Dinocyon, equities referred to Hip- 

 parion occidentale and Protohippus fperditus. It is significant that no Meryehippus has been recorded here. The impor- 

 tant equine types described from this region by Cope are the following: 



Type of PHohippus (= Protohippus) fossulatus 



Cope, 1893.1. 

 Type of Protohippus pachyops Cope. 1893. 



" " PHohippus (Hi ppidium) interpolatus Cope, 



1893.2. 



Type of Hipparion (Protohippus) lenticulare, Cope, 

 1893.1. 



Type of Ilipparion (Equus) eurystyle Cope, 1893.2. 



SOUTH DAKOTA 



PI 



>GE 



NE RID( 

 INDIAN | RESERVATION 



LittL 



1 







Rosebud 





J** 



( X 



if — f — 



sion 



RO'SEBUD 



i 



INDIAN 

 RESERVATION 



NEBRASKA 



Fig. 14. Exposures of the Procamelus-Hipparion zone, Lower Pliocene. 

 Outline map showing the localities on the Niobrara River, Nebraska, and Little White River, South Dakota, where 

 Leidy, Gidley, and Troxell secured some of their chief equine types, including: 8 ? Protohippus simvs, 9 Protohippus 

 niobrarensis, 14 Hipparion whitneyi, 15 Ilipparion dolichops, 10 Protohippus ? sp., 17 PHohippus lullianus. 



Orinda and Siestan, Central California. 

 Of Early Pliocene age, (Merriam, 1917), occurring in the hills immediately east of Berkeley, middle California. 



This horizon contains remains of Procamelus, Pliauchenia, ? Meryehippus, Protohippus, and Hipparion, including: 



Type of Hipparion platystyle Merriam, 1915.4. 



