TERTIARY DEPOSITS NEAR COALINGA OIL FIELD oN | 
the field, and the Jacalitos-Etchegoin appears to be one progressive 
series overlapping far upon older rocks during a period of long- 
continued submergence. 
RESULTS 
Taking the results as a whole, it is probable that the most 
prominent and important geological fact brought to light is the 
continued and repeated oscillations of this part of the territory in 
Tertiary time, as opposed to the former idea of a practically unin- 
terrupted sedimentation—proving that land areas existed here at 
the end of the Chico, the Tejon, and the Santa Margarita, and 
probably at the end of the Martinez and the Monterey. 
The most extensive of these emergences was that between the 
Cretaceous and Tertiary; the next that between the Eocene and 
Miocene. ‘Those between the Martinez and the Tejon and that 
at the end of the Monterey are not so definitely made out as yet, 
but there is good evidence of their existence. 
The results of temporary oscillations occurring between or dur- 
ing these times are clearly apparent in the local unconformities 
existing in the various formations. 
