U. S. GEOLOGICAL SURVEY 
BULLETIN NO. 322 PL. II 
Alluvium (1' —100'+)_ 
Sand dunes (10' —300' + ) . 
Terrace deposits (30' + )... 
Unconformity. 
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Fernando formation (3,000'+). ' 
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Unconformi t y. 
Monterey shale (5,400'+).( =-=== 
W estern 
Union. 
Zone A. 
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Vaqueros, Sespe. and Tejon , 
formations, undifferentiated ‘ 
(5,000' + ). 
Sand. clay, gravel, and earth. 
Marine sand, loosely aggregated and slightly ho-izontally bedded. 
Sand, gravel, and clay, often hardened by iron oxide. Seepage from Monterey often causes asphalt deposits 
Slightly consolidated gravel, sand, and clay. 
Brackish-water limestone and alkaline sand. 
Fine, soft, yellow sand near bottom, grading upward into coarser white and gray sand and gravelly conglomerate. 
Fine, white, diatomaceous shale and fine, white and greenish sand. Local breccia and asphalt deposits (shown 
in black). 
Soft, white, thin-bedded, diatomaceous earth or shale, with intercalated beds and lenses of concretionary lime 
and hard, brittle, siliceous shale due to metamorphism. Occasional fine sand beds. Shale locally bituminous ; 
gypsiferous near top. 
Thinly stratified and much-contorted hard, brittle, and siliceous shale, often flinty, with some soft, unmetamor¬ 
phosed diatomaceous shale and frequent beds of limestone and flint. Tuff and volcanic ash occur locally; 
Shale bituminous. Four principal petroleum zones shown in black and auxiliary zones indicated. 
Alternating beds of dark clay shale, sandy shale, and sandstone; frequent massive limestones near top. Thick 
beds of line and very coarse conglomerate in upper portion. Shale and sandstone thin-bedded; sandstone 
becoming more massive toward top. 
The relation of the formations above to those below is not known. 
The rocks mapped as pre-Monterey may till this gap and lap over onto the formations above and beh > w. 
r 
Knoxville formation (3,000'=t). 
Not extensively recognized, j 
Thickness and character as - 
described by Fairbanks in ad¬ 
jacent San Luis quadrangle. 
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Unconformity. f 
Franciscan formatio n (1.000'+=). .j 
COLUMNAR SECTION OF THE SEDIMENTARY ROCKS OF THE LOMPOC AND GUADALUPE QUADRANGLES. 
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Dark, thin-bedded clay shale, with thin irregular layers of conglomerate at bottom and near middle. 
Largely intrusive serpentine, associated with much-contorted banded jasper, dark, greenish hard sandstone and 
shale, and with some glaucophane schist. 
