﻿GEOLOGY. 
  33 
  

  

  Vaqueros 
  (lower 
  Miocene) 
  fossils 
  from 
  the 
  Santa 
  Maria 
  district, 
  California 
  — 
  Continued. 
  

  

  

  4478. 
  

  

  4504. 
  

  

  4508. 
  

  

  4510. 
  

  

  4511. 
  

  

  4512. 
  

  

  4514. 
  

  

  4516. 
  

  

  4517. 
  

  

  4519. 
  

  

  4520. 
  

  

  4521. 
  

  

  Terebratalia 
  kennedyi 
  

   Dall 
  (PI. 
  XVII, 
  fig. 
  4a, 
  

   4b, 
  4c, 
  4d) 
  

  

  

  

  

  

  

  

  

  

  

  

  

  X 
  

  

  Purpura 
  vaquerosensis 
  

   Arnold 
  (PI. 
  XV, 
  figs. 
  la, 
  

   lb) 
  

  

  

  X 
  

  

  

  

  

  

  

  

  

  

  

  Turritella 
  sp. 
  indet 
  

  

  

  X 
  

  

  

  

  

  

  

  

  

  

  

  Turritella 
  ineziana 
  Con- 
  

   rad 
  (PI. 
  XVI, 
  fig. 
  3) 
  

  

  

  

  

  

  

  X 
  

  

  X 
  

   X 
  

  

  X 
  

  

  

  

  

  Turritella 
  variata 
  Conrad 
  

   (young?) 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  4478. 
  Two 
  miles 
  south 
  of 
  Santa 
  Ynez, 
  on 
  knoll 
  just 
  east 
  of 
  mouth 
  of 
  Ballard 
  Canyon. 
  

   4504. 
  Three-fourths 
  of 
  a 
  mile 
  up 
  ridge 
  northeast 
  of 
  San 
  Julian 
  ranch 
  house, 
  1± 
  miles 
  east 
  of 
  bench 
  

   mark 
  603. 
  

   4508. 
  El 
  Jaro 
  Creek, 
  one-fourth 
  mile 
  east 
  of 
  Salsipuedes 
  Creek, 
  southeast 
  of 
  Lompoc. 
  

  

  4510. 
  Five 
  miles 
  north 
  of 
  Concepcion, 
  one-fourth 
  mile 
  west 
  of 
  mouth 
  of 
  Escondido 
  Creek. 
  

  

  4511. 
  Float 
  on 
  hillside 
  along 
  east 
  side 
  of 
  Los 
  Amoles 
  Creek, 
  1 
  mile 
  above 
  El 
  Jaro 
  Creek. 
  

  

  4512. 
  Ridge 
  between 
  Los 
  Amoles 
  and 
  Salsipuedes 
  creeks, 
  10J 
  miles 
  S. 
  33° 
  E. 
  of 
  Lompoc 
  bench 
  mark 
  95. 
  

   4514. 
  About 
  10 
  miles 
  west 
  of 
  Santa 
  Ynez, 
  on 
  south 
  bend 
  of 
  river 
  1| 
  miles 
  southeast 
  of 
  bench 
  mark 
  552. 
  

  

  4516. 
  South 
  of 
  Santa 
  Ynez 
  Mission, 
  1\ 
  miles 
  up 
  Alisal 
  Creek, 
  at 
  mouth 
  of 
  valley 
  on 
  east. 
  

  

  4517. 
  Three 
  miles 
  north 
  of 
  Sudden, 
  on'north 
  flank 
  of 
  1,912-foot 
  hill, 
  above 
  locality 
  4518, 
  which 
  is 
  Eocene. 
  

   (See 
  p. 
  29.) 
  

  

  4519. 
  On 
  ridge 
  2 
  miles 
  east-southeast 
  of 
  El 
  Jaro 
  Creek, 
  bench 
  mark 
  603, 
  one-half 
  mile 
  west 
  of 
  1,111-foot 
  

   hill. 
  

  

  4520. 
  West 
  side 
  of 
  ridge 
  between 
  Los 
  Amoles 
  and 
  El 
  Jaro 
  creeks, 
  1 
  mile 
  west 
  of 
  bench 
  mark 
  603. 
  

  

  4521. 
  Lime 
  quarry 
  5 
  miles 
  southwest 
  of 
  Lompoc. 
  

  

  MONTEREY 
  SHALE 
  (MIDDLE 
  MIOCENE). 
  

   GENERAL 
  STATEMENT. 
  

  

  A 
  great 
  series 
  of 
  fine 
  shales, 
  largely 
  of 
  organic 
  origin, 
  overlies 
  con- 
  

   formably 
  the 
  coarse 
  and 
  fine 
  sedimentary 
  deposits 
  of 
  the 
  Vaqueros. 
  

   These 
  shales 
  make 
  up 
  the 
  Monterey 
  formation 
  and 
  are 
  probably 
  rep- 
  

   resentative 
  of 
  the 
  whole 
  of 
  middle 
  Miocene 
  time. 
  The 
  series 
  is 
  of 
  

   great 
  thickness 
  and 
  is 
  doubly 
  important 
  as 
  the 
  probable 
  source 
  and 
  

   the 
  present 
  reservoir 
  of 
  the 
  oil. 
  The 
  areal 
  extent 
  of 
  the 
  Monterey 
  is 
  

   not 
  adequately 
  represented 
  on 
  the 
  map. 
  It 
  doubtless 
  covers 
  as 
  one 
  

   continuous 
  sheet 
  the 
  whole 
  basin 
  between 
  the 
  Santa 
  Ynez 
  and 
  San 
  

   Rafael 
  mountains, 
  as 
  well 
  as 
  a 
  large 
  part 
  of 
  these 
  ranges, 
  but 
  it 
  is 
  con- 
  

   cealed 
  over 
  considerable 
  areas 
  by 
  later 
  deposits, 
  which 
  are 
  in 
  many 
  

   places 
  very 
  thin. 
  The 
  character, 
  structure, 
  and 
  relations 
  of 
  the 
  Mon- 
  

   terey 
  have 
  been 
  the 
  chief 
  subject 
  of 
  the 
  present 
  study. 
  

  

  The 
  name 
  Monterey 
  was 
  given 
  by 
  William 
  P. 
  Blake 
  a 
  in 
  the 
  early 
  

   fifties 
  to 
  an 
  organic 
  shale 
  formation 
  typically 
  developed 
  near 
  Mon- 
  

   terey, 
  in 
  central 
  California. 
  It 
  is 
  very 
  extensive 
  in 
  the 
  California 
  

   Coast 
  Ranges, 
  being 
  the 
  " 
  bituminous 
  shale" 
  described 
  by 
  Whitney 
  6 
  

   as 
  occurring 
  at 
  widely 
  separated 
  points 
  north 
  and 
  south 
  of 
  the 
  Golden 
  

   Gate. 
  Its 
  age 
  is 
  generally 
  taken 
  as 
  middle 
  Miocene. 
  It 
  is 
  the 
  source 
  

   of 
  much 
  of 
  the 
  petroleum 
  found 
  in 
  California. 
  The 
  shale 
  characteristic 
  

   of 
  this 
  unique 
  formation 
  is 
  not 
  similar 
  to 
  ordinary 
  clay 
  shale, 
  but 
  is 
  

   composed 
  largely 
  of 
  the 
  remains 
  of 
  minute 
  marine 
  organisms. 
  In 
  an 
  

  

  aProc. 
  Acad. 
  Nat. 
  Sci. 
  Philadelphia, 
  vol. 
  7, 
  1855, 
  pp. 
  328-331. 
  

   b 
  Geological 
  Survey 
  of 
  California, 
  Geology, 
  vol. 
  1, 
  1865, 
  p. 
  137. 
  

  

  