1 86 CALIFORNIA ACADEMY OF SCIENCES [Proc. 30 Ser. 



Other Occurrences of Lower Miocene within the 



Interior Basin. 



For purposes of comparison and for a more complete 

 understanding of the Lower Miocene fauna within the inte- 

 rior basin of California, brief descriptions of other occurrences 

 are here given. In a short paper recently published by Dr. 

 Merriam^ the Lower Miocene beds of Contra Costa County 

 are described, including a partial list of fossils. The beds are 

 said to rest directly upon the Tejon, and to be overlain by 

 beds of Monterey Shale. The most characteristic species 

 are : 



Aj^asoma gravidum Gabb Chione mathewsoni Gabb 



Dosinia matheivsoni Gabb Mytilus mathewsoni Gabb 



« 



The stratigraphic thickness of these beds was not given, 

 but it is probably commensurate with that of the Temblor 

 Sandstone. 



San Emidio Sf.ction. 



An instructive section of the rocks of the San Emidio 

 Canyon is to be found in Whitney's^ description. In refer- 

 ring to this illustration, however, it is necessary to remember 

 that Eocene rocks were classed by him as Cretaceous. 



Overlying the Eocene beds are beds of Lower Miocene 

 age with a fauna similar to that already described for the 

 Temblor Beds. 



The dip is toward the north at a high angle, and the strike 

 is conformable to that of the Eocene and later rocks. The 

 Monterey Shales are missing from this section, or if present 

 were not recognized. The beds may be traced westerly and 

 northwesterly toward the Carisa, toward McKittrick and 

 Temblor, and perhaps easterly toward the Tejon ranch. 



Beds of the Carisa Ranch. 



Near the Carisa ranch house, along the San Juan River, 

 San Luis Obispo County, an enormous thickness of Miocene 



1 Bull. Dept. Geol. Univ. Calif, v. 3, pp. 377-381. 



2 Geol. Surv. Calif. Geol. v. i, p. 189. 



