72 
OIL-FIELD WATERS IN SAN JOAQUIN VALLEY, CAL. 
a water from a considerable depth, probably in the Vaqueros forma¬ 
tion, is characterized by a lower concentration than many surface 
waters, although its properties resemble those of the other brines. 
Nos. 54 and 59 contain only minute amounts of sulphate. Analysis 
88 (Table 14) represents a brine associated with the oil in the Lost 
Hills field. 
