136 BRUCE CLARK 
as exposed in the mine at Nortonville, is intercalated between the 
coarse, white, quartzitic sands without a trace of shale. 
Evidence for unconformity between Meganos and Tejon.—The 
most important evidence for unconformity between the Meganos 
and the Tejon is the great difference in strike between the beds 
of the two horizons, seen at numerous localities; this is very 
noticeable at the coal mine at Stewartville, where the difference 
approximates 15° (Fig. 1). The basal sandstone of division D is 
here in contact with the Tejon, the thickness of the sandstone 
being approximately 150 feet. Followed west of Stewartville, the 
sandstone disappears and the basal beds of the Tejon rest directly 
on the upper dark-colored shale (division C), and a little west and 
south of Nortonville the Tejon rests on the first sandstone member 
below the top of division C. Southeast of Stewartville the sand- 
stone of division D emerges from beneath the Tejon and forms 
the ridge north of Deer Valley; the shaly sandstones and shales 
of division E also appear, and within 3 or 4 miles of Stewartville 
show their maximum thickness, 1,500 feet. In the canyon south 
of the Star Mine, not much more than a mile from Stewartville, 
the upper shales of division E are well developed. 
Besides this difference in strike and the rapid emergence of 
the upper Meganos beds from beneath the Tejon, a marked differ- 
ence in dip was noted at a number of localities southeast of Stewart- 
ville. In general it appears that there is a difference in dip between 
the two horizons throughout the entire length of the area. At 
the west end of the area southwest of Nortonville there is a maxi- 
mum difference in dip of 18° between the upper Meganos beds and 
those of the lower Tejon. In the vicinity of Stewartville the 
difference approximates only about five degrees, while in the 
vicinity of West Hartley the difference is between 15° and 20°. 
In the western part of the area under discussion, there are 
heavy conglomerates at the base of the Tejon which in some places 
have a thickness approximating 20 feet. Here they rest on the 
dark shale of division C, and at a number of localities a sharp 
irregular contact was seen, the bedding planes of the shale being 
cut off by the conglomerate. It is a noticeable fact, also, that 
there is considerable carbonaceous material at the contact. In 
