INDEX. 
159 
Page. 
Oil companies, list of. 119-120 
number of. 124 
Oil fields, detailed descriptions of.92-109 
See also particular fields. 
Oil wells, character of. 123 
drilling of. 120 
geology of. 94-95 
oil of. 95,97,99,101,102,104,123 
yield of. 9,96,97,99-104,107,109,120-121,123,124 
Oil zones, character of. 73,93-102,104 
geologic position of. 94,106-107 
Olivella biplicata Sowerby, occurrence of... 59 
intorta Carpenter, occurrence of. 59 
O’Neill, Edmond, analyses by. 117-118 
on Santa Maria oil. 117 
Opalia anomala Stearns, occurrence of. 59 
varicostata Stearns, occurrence of. 59 
Orcutt, fossils near. 58-60 
Oreutt, W. W., work of. 87 
Orogenic movements, occurrence of.66-70 
Ostreaeldridgei Arnold, figure showing... 134,138 
eldridgei Arnold, occurrence of. 32 
idrisensis Gabb, figure showing. 130 
occurrence of. 32 
veatchii Gabb, figure showing. 148 
occurrence of. 59 
sp., occurrence of. 32 
P. 
Panomya ampla Dali, occurrence of. 59 
Panopea generosa Gould, occurrence of. 59 
Patinopecten healeyi A mold,figure showing. 154 
healeyi Arnold, occurrence of. 59 
oweni Arnold, figure showing. 152 
occurrence of. 59 
Pecten (Lyropecten) bowersi Arnold, figure 
showing. 138 
(Lyropecten) bowersi Arnold, occur¬ 
rence of. 32 
(Plagioctenium) cerrocensis Gabb, oc¬ 
currence of. 59 
(Lyropecten) crassicardo Conrad, figure 
showing. 138 
occurrence of. 32 
(Patinopecten) healeyi Arnold, figure 
showing. 154 
occurrence of. 59 
(Pecten) hemphilli Dali, figure showing. 152 
occurrence of. 59 
(Chlamys) lawsoni Arnold, figure show¬ 
ing. 152 
occurrence of. 59 
(Amusium) lompocensis Arnold, figure 
showing. 138 
occurrence of. 32 
(Lyropecten) magnolia Conrad, figure 
showing. 134 
occurrence of. 32 
(Patinopecten) oweni Arnold, figure 
showing. 152 
occurrence of... 59 
(Chlamys) sespeensis var. hydei Arnold, 
figure showing. 136 
occurrence of. 32 
(Pecten) stearnsii Dali, figure showing. 152 
occurrence of. 59 
Page. 
Pecten vauvlecki Arnold, figure showing ... 136 
occurrence of. 32 
(Pecten) wattsi Arnold, figure showing. 152 
occurrence of. 59 
(Chlamys) yneziana Arnold, figure 
showing. 126,128 
occurrence of. 32 
Pectens, plates showing. 152,154 
Pelecypoda, plates showing. 130,136,138 
Phacoides acutilineatus Conrad, occurrence 
of. 47 
annulatus Reeve, figure showing. 148 
occurrence of. 59 
cumulata Gabb, figure showing. 130 
occurrence of. 32 
intensus Dali, figure showing. 148 
occurrence of. 59 
nuttallii Conrad var. antecedens Ar¬ 
nold, figure showing. 146 
var. antecedens Arnold, occurrence 
of. 59 
(Miltha) sp., occurrence of. 32 
Pholadidea ovoidea Conrad, figure showing. 146 
ovoidea Conrad, occurrence of. 59 
sp., occurrence of. 59 
Pinal-Folsom-Santa Maria Oil and Gas- 
Escolle area, description of.98-99 
Pinal-Fox-Hobbs area, description of.96-97 
Pinal Oil Co., development by. 14 
Pine Canyon anticline, description of. 83 
Pipe lines, location of. 121 
Plagioctenium cerrocensis Gabb, occurrence 
of. 59 
Platyodon cancellatus Conrad var., occur¬ 
rence of. 59 
Pleistocene deposits, character of..... 27 
terraces of. See Terraces. 
Pleistocene time, history in. 70 
Pleurotoma (Borsonia) sp., occurrence of.. 59 
Pliocene rocks, character of. 27 
fossils in, plates showing. 144-154 
Pliocene shells, occurrence of. 13-14 
Point Sal Ridge, definition of. 16 
geology of. 12-13,65 
Population, number of. 15 
Price Canyon, oil in. 107 
Priene oregonensis Redfield (Young), figure 
showing. 144 
oregonensis Redfield (Young), occur¬ 
rence of. 59 
var. angelensis Arnold, occurrence 
of. 59 
Production, amount of. 9,96,97, 
99-104,107,109,120-121 
Prutzman, P. W., analyses by. 115,117 
Purisima formation, correlation of. 27 
Purisima Hills, asphalt in. 85 
definition of. 16 
description of. 21-22 
diatomaceous earth in. 38,54-55 
geology in. 56 
oil in. 84-86,91 
structure of. 84-85 
Purpura crispata Chemnitz, figure showing. 146 
crispata Chemnitz, occurrence of. 59 
Putrefaction, rate of, influence of, on pro¬ 
duction of oil. 112 
