152 BRUCE CLARK 
the basal conglomerate of the Tejon rests on the granite. Just 
back of the ranch-house, a little farther west, a remnant of the 
basal Meganos sandstone outcrops below the basal conglomerate. 
Here the unconformity is evident. Traced east of this locality, the 
Meganos beds are found to thicken rapidly, reaching their maximum 
thickness near the head of Pleito Canyon about three miles to 
the east, where the Meganos beds have an estimated thickness 
of more than one thousand feet. As shown on the map, these beds 
thin out rapidly farther east, and in the canyon of Salt Creek, only 
a little more than four miles distant, their thickness probably is 
not more than one hundred feet. The conglomerate of the basal 
_ Tejon was traced to Tecuya Creek in the next large canyon east 
of Salt Creek. In Grape Vine Canyon the basal conglomerate 
of the Tejon was found to be separated from the granite by about 
twenty-five feet of unfossiliferous, coarse arkosic sandstone, together 
with a few feet of dark shales. 
Thus the beveled Meganos is transgressed by the Tejon from 
west to east in the vicinity of Grape Vine Canyon, only a very 
small part of the Meganos being left, and in the next canyon to 
the east of Live Oak Canyon the Meganos beds fail to appear. 
Lithology—The Meganos outcrops are best exposed between 
Pleito and San Emigdeo canyons. The basal beds consist of 
several hundred feet of fairly indurated, coarse, reddish-gray 
arkosic sandstone. The upper part of the section is composed 
principally of sandy shales and platy shaly sandstone. 
The Tejon beds of this region have a thickness of a little more 
than two thousand feet. The thickness in the vicinity of Grape 
Vine Canyon was estimated to be about twenty-four hundred 
feet. In the vicinity of this canyon the beds consist principally 
of medium-fine buff-colored sandstone, with lenticular harder, 
calcareous fossiliferous layers. This section, as already described 
by Anderson and Dickerson, is very uniform in lithology. To 
the west these beds become finer, and in the vicinity of 
San Emigdeo Canyon the larger part of the section might be 
described as a mudstone. In places lenses of conglomerate are 
found with the finer sediments, and at one horizon not very far 
from the base is a heavy layer of conglomerate that can be traced 
