304 CALIFORNIA ACADEMY OF SCIENCES. 



"Grits and calcareous sandstones, as at Panza and 



Santa Margarita 360 feet. 



San Antonia sandstones, with Dosina, etc 250 feet. 



Gypseons and ferruginous sandstones of Santa Inez, 

 Panza and Gavilan, containing Ostrea, Turritella, 

 etc." * 1,200 feet. 



Or thickness below White shale 1,810 feet. 



Occurrence. — The Pescadero series is well exposed 

 at a number of points about San Francisco Bay. At 

 Benicia, Blake found in rocks of this series a Trochus, 

 Turritella and shark's tooth. In San Francisco it makes 

 up the three hills in the northeast, or business quarter, 

 of the city. The hills just north and west of Ocean 

 View and most of the San Bruno Mountains belong to this 

 series. It is finely exposed at Point San Pedro and at 

 Pescadero. It appears to be one of the most abundant 

 formations of the Santa Cruz Mountains. It occurs 

 abundantly in the Mount Hamilton Range and to some 

 extent in the Mount Diablo Range. 



If it be correctly correlated with the lower Miocene 

 strata worked up by Mr. Antisell, it will probably be 

 found that this formation is, widespread all through the 

 Coast Ranges. 



Relations. — The relation to the underlying metamor- 

 phic rocks has already been discussed under that head. 

 The existence of water-worn metamorphic fragments in 

 the Pescadero series would argue for a nonconformity 

 between the two formations, unless, as above, we assume 

 uplift and extensive erosion during one part of the period 

 of deposition of the Pescadero series. 



At Pescadero Point the Pescadero series is overlain 

 unconformably by strata having only a small dip, and in 

 turn both are overlain by about six feet of horizontal 



* Pacific K. E. Keport, vol. 7, p. 197. 



