274 University of California Publications in Geology [Vol. 7 



conitic shales and limestones occur here. There seems no room 

 for doubt that these beds represent the same horizon in the Tejon 

 as those on the west side of the Buttes. 



The writer did not find fossils in the locality two and one-half 

 miles north-northwest of South Butte, but the same bright red 

 soil with concretionary limestone occurs here as a narrow strip 

 bordered on the east and west by lone conglomerates. It is 

 lithologieally the same as the Tejon area two miles south. Since 

 these are the only localities which were described as furnishing 

 marine lone fossils it would seem that marine Tejon has been 

 confused with lone, and that there is no evidence to indicate the 

 presence of an extension of the sea into this region in Miocene 

 time. 



Summary 



1. The Eocene of the Marysville Buttes is evidently of a 

 relatively late stage. 



2. Glauconitic beds, previously known only from the Mar- 

 tinez in the California Eocene, are present in the uppermost 

 Eocene of the Marysville Buttes region. 



3. There is no evidence of brackish water or of estuarine con- 

 ditions in the region of Marysville Buttes while the uppermost 

 glauconitic beds containing Tejon fossils were accumulating. 



i. The fossil-bearing beds of the Marysville Buttes Eocene 

 accumulated in water about 100 fathoms deep. 



5. The faunal zone represented by these beds appears to be 

 younger than the Tejon of the type localities. 



6. The climatic conditions obtaining in the Marysville Buttes 

 region during the deposition of the Eocene beds were tropical 

 or subtropical. 



7. The supposed marine lone of Marysville Buttes is evi- 

 dently Eocene. 



Description of Species 



SYNECHODUS, sp., 

 PJate 14, figure 7 



Tooth with sharply tapering cusps. Median cusp nearly 

 straight, acute, margins sharp, inner side convex, the outer side 

 is nearly flat with a slight concavity near the root. There are 



