LOS ANGELES DISTRICT: EASTERN FIELD. 
161 
west of Los Angeles River, where the peculiar jointing features, pre¬ 
viously described, are prominently developed. Above the sand¬ 
stone is the typical white siliceous shale, which extends in a broad 
band from the region of the Catholic cemetery northwestward along 
the flank of the Elysian Park hills. At the northwest corner of the 
cemetery this shale is very much crumpled, but northwest of this 
point it appears to be little distorted and dips about 45° S. 30° W. 
The top of the shale is marked by a 50-foot band of heavy-bedded, 
coarse light-yellow to brown concretionary sandstone, which is well 
exposed on the southwest side of Sunset boulevard near its intersec¬ 
tion with Sutherland street. At the west end of this exposure the 
sandstone is cut off by a fault which has thrown some shale beds 
down against the sandstone on the west. The sandstone, together 
with its underlying and overlying white-shale bands, may be traced 
in a southeasterly direction from the locality last mentioned toward 
the oil field as far as the quarries on the west side of the Chavez 
Ravine road. Its dip along this line is also 45° S. 30° W. What is 
probably a continuation of the same sandstone band is exposed on 
the east side of the ravine a short distance north of the corner of 
Adobe and Bernardo streets, but the rocks here are so near the frac¬ 
ture zone and so much disturbed that the correlation is more or less 
uncertain. This sandstone layer and its associated shale are easily 
differentiated in old surface exposures, but in fresh road cuts and 
quarries their identification is more difficult. The overlying band 
of shale, which is characteristically thinly laminated and of flinty 
siliceous composition, underlies a considerable thickness of medium- 
to thin-bedded soft sandstone and sandy shale. These beds are well 
exposed in the brick company’s quarries on the southwest side of 
Chavez Ravine. At the sharp bend in Figueroa street on the south 
end of the ridge west of the ravine, and extending westward at least 
as far as Ramona street just north of its intersection with College 
street, is another band of thin-bedded white shale which normally 
lies above, but which here is probably faulted down against the soft 
sandstone and sandy shale last described. This white shale is simi¬ 
lar to that lying above the oil sands in the region west of the Sisters’ 
Hospital and, like it, is much more resistant to weathering than the 
oil sands. If the two shales are identical it would be reasonable to 
suppose that the oil sands lie only a short distance beneath the shale 
at the Figueroa and Ramona street outcrops. This supposition is 
borne out by the wells only a short distance south of the white-shale 
outcrop, which strike productive sands at depths somewhat greater 
than 600 feet. Owing to the faulting down of the oil-bearing beds 
against the older strata on the north, no outcrops of the oil sands 
have so far been discovered in the eastern field. The beds overlying 
