ILLUSTRATIONS. 
Page, 
Plate I. Preliminary geologic and structural map of the Santa Maria district. Pocket 
II: Columnar geologic section of the Lompoc and Guadalupe quadran¬ 
gles. 26 
III. A, View of characteristic exposure of volcanic ash on Cuyama Piver; 
B, View of flinty Monterey shale on Sisquoc River. 34 
IV. A, View of characteristic exposure of diatomaceous shale north of 
Casmalia; B, View showing in detail weathering of diatomaceous 
shale. 36 
V. A, Typical specimen of diatomaceous shale; B , A similar shale after 
metamorphism by burning.:. 36 
VI. A, View of upper Fernando gravel, east of Figueroa Creek; B, View 
of sharp folds in Monterey shale north of Zaca Lake. 46 
VII. Geologic sections across Guadalupe and Lompoc quadrangles. 74 
VIII. A, View of Alcatraz asphalt mine, east of Sisquoc; B, View of Mio- 
cene-Pleistocene unconformity northeast of Casmalia. 78 
IX. A, B, Panorama of monocline in Monterey shale northwest of Cas¬ 
malia; C, D, View looking north at Graciosa and Western Union 
wells. 80 
X. Sketch contour map of the Santa Maria oil field. 92 
XI. A, View of Fernando brea deposit overlying Monterey shale, Gra¬ 
ciosa Ridge; B, View of saddle in Monterey, Fernando, and Pleis¬ 
tocene beds near Hartnell well No. 1. 98 
XII.* Tejon (Eocene) fossils. 126 
XIII. Knoxville (Cretaceous) and Tejon (Eocene) fossils. 128 
XIV. Tejon (Eocene) Pelecypoda. 130 
XV. Vaqueros (lower Miocene) fossils. 132 
XVI. Vaqueros (lower Miocene) fossils. 134 
XVII. Vaqueros (lower Miocene) Pelecypoda and Brachiopoda. 136 
XVIII. Vaqueros (lower Miocene) Pelecypoda. 138 
XIX. Monterey (middle Miocene) diatoms. 140 
XX. Monterey (middle Miocene) diatoms. 142 
XXI. Fernando (Pliocene) Gasteropoda. 144 
XXII. Fernando (Pliocene) fossils. 146 
XXIII. Fernando (Pliocene) fossils. 148 
XXIV. Fernando (Pliocene) fossils. 150 
XXV. Fernando (Pliocene) pectens. 152 
XXVI/ Fernando (Pliocene) pecten. 154 
