PUENTE HILLS: LA HABRA CANYON FIELD. 115 
Puente anticline, within a mile or two of the west end of the fold. 
The wells are sunk in Fernando conglomerate and sandstone, which 
have a regular dip. They were not a marked success and no more 
have been drilled in the immediate vicinity, although at depths be¬ 
tween 900 and 1,500 feet oil-bearing strata affording a small yield 
were encountered. These wells are of especial interest, since they 
are among the first to be exploited in the younger formation on the 
north limb of the anticline. Faults of importance have not been 
observed in this locality. From surface indications the position 
of the North Whittier wells seems to be somewhat analogous to that 
of other wells in such productive fields as Coalinga, Midway, and 
Sunset, where petroleum occurs in formations having remarkable 
evenness of dip, strike, and succession. 
The productive wells of the Whittier field embrace those of the 
Home, Turnbull Canyon, Turner, Fidelity, Strong, Central, Warner, 
and Murphy oil companies. Other companies have drilled at various 
points in the field, but thus far without success. In general, the 
wells immediately south of the fracture have been found productive; 
those to the north unproductive. (PI. XIV, B.) 
LA HABRA CANYON FIELD. 
LOCATION. 
The region of La Habra Canyon occupies the heart of the Puente 
Hills, midway between the Whittier and Puente fields. It has an 
east-west length of about 3 miles, the productive territory being near 
the west end. 
GEOLOGY. 
The geologic relations between this and the fields on either side 
have not been fully established, but in a broad sense the three are 
similar, the principal differences consisting in the details of folding, 
their position within the general anticline, and the strata pierced. 
The formations of the region include the upper and lower members of 
the Puente formation, together with the intervening sandstone, and 
the Fernando conglomerate, sandstone, and clay. Exposures of the 
lower shale are limited to the center of the general anticline in the 
eastern part of the area; the Puente sandstone outcrops in the middle, 
a trace of the upper shale overlying, while the Fernando formation 
almost closes over and around the older beds at the west end. West 
of this the conglomerate again gives way to outcrops of the Puente, 
which in the Whittier field occupies a large proportion of the ridge 
crest. 
