1921] Prick: Faunas of Bautista Creek and San Timoteo Canon 289 



comparison, than any one of the other known . forms. They are 

 evidently of more primitive type than such species as Pliohippiis 

 proversus Merriam of the Upper Etehegoin and Equiis idahoensis 

 Merriam of the probably still later Idaho formation. 



Bautista. — The tooth pattern of Equus bautistensis suggests a 

 greater degree of specialization than that seen in E. occidentalis of 

 La Brea. The teeth while markedly smaller than the type specimens 

 of E. pacificus and E. gigantens, are very similar in both size and 

 pattern to the teeth of E. nioharensis of Nebraska and apparently to 

 those of E. scotti of Texas. They are much less specialized than the 

 specimens representing the types of E. complicatus and E. fratcrnus 

 Leidy. 



PLEISTOCENE FORMATIONS OP THE BAUTISTA CREEK 



BADLANDS 



The Bautista Creek Badlands (fig. lb) lie within the foothills of 

 the San Jacinto Mountains some six miles to the southeast of the 

 badlands of the San Timoteo Caiion. They comprise two large, hilly 

 areas divided by the westwardly flowing San Jacinto River. The 

 more southern area includes the Bautista type locality and stretches 

 six miles southeast between the converging San Jacinto River and 

 Bautista Creek to the igneous wall of the mountainous foothills. 

 At places along this southeastern line of indefinite north and south 

 contact with the basement mass the brush grown sedimentary hills 

 rise to an altitude of 3500 feet. The northern boundary of the 

 Bautista type area and the southern boundary of the second, or 

 Soboban area, is formed by the river. The former unity of both the 

 north and south sedimentary areas is well indicated by the general 

 similarity of the bedding on either bank of the San Jacinto River. 

 A sedimentary remnant, Park Hill, lying immediately to the north- 

 west in the Hemet' plain, may belong to the Bautista, and the present 

 isolation may be due to the cutting of the river or its tributaries. The 

 beds forming the Bautista type locality are bounded on the south by 

 the creek of like name and by Rouse's Creek, which joins it from the 

 southeast. The two streams follow the line of contact between the 

 sedimentary deposits and the basement rock, which is believed to mark 

 a fault. An interesting contact between the formation and the base- 

 ment complex may be seen on the right bank of the San Jacinto River, 

 just west of the mouth of South Fork, where gently north-dipping 

 Bautista sediments rest upon steeply pitching granites (pi. 43, lower 



