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  SANTA 
  MARIA 
  OIL 
  DISTRICT, 
  CALIFORNIA. 
  

  

  Zaca 
  Creek 
  Lisque 
  Creek 
  anticlines, 
  viz, 
  the 
  adjacent 
  anticlines 
  are 
  

   en 
  echelon 
  with 
  each 
  other, 
  each 
  plunging 
  down 
  past 
  the 
  end 
  of 
  its 
  

   neighbor. 
  Graciosa 
  and 
  Harris 
  canyons, 
  particularly 
  the 
  former, 
  

   arc 
  the 
  superficial 
  reflection 
  of 
  the 
  syncline 
  between 
  the 
  ends 
  of 
  the 
  

   Mount 
  Solomon 
  and 
  Schumann 
  anticlines, 
  and 
  Solomon 
  Canyon 
  and 
  

   Canada 
  de 
  los 
  Alisos 
  occupy 
  analogous 
  positions 
  between 
  the 
  Mount 
  

   Solomon 
  and 
  Gato 
  Ridge 
  and 
  the 
  Gato 
  Ridge 
  and 
  La 
  Zaca 
  Creek- 
  

   Lisque 
  Creek 
  anticlines, 
  respectively. 
  

  

  Asphaltum 
  <l< 
  j><>sits. 
  Practically 
  the 
  whole 
  top 
  of 
  Graciosa 
  Ridge 
  

   is 
  capped 
  by 
  post-Monterey 
  sandstones 
  and 
  conglomerates, 
  which 
  

   are 
  heavily 
  charged 
  with 
  asphaltum. 
  Asphaltum 
  also 
  occurs 
  as 
  

   veins 
  penetrating 
  the 
  Monterey 
  and 
  post-Monterey 
  beds 
  at 
  the 
  

   east 
  end 
  of 
  the 
  ridge, 
  and 
  a 
  fine 
  example 
  of 
  asphaltum 
  veins 
  and 
  vein- 
  

   lets 
  filling 
  the 
  joint 
  cracks 
  in 
  the 
  Monterey 
  is 
  to 
  be 
  seen 
  beside 
  the 
  

   road 
  leading 
  up 
  to 
  the 
  Santa 
  Maria 
  Oil 
  and 
  Gas 
  (Squires) 
  w 
  T 
  ell 
  No. 
  4. 
  

   This 
  occurrence 
  of 
  the 
  asphaltum 
  in 
  the 
  joint 
  cracks 
  of 
  the 
  shale 
  

   gives 
  a 
  clew 
  to 
  the 
  probable 
  channels 
  through 
  which 
  the 
  oil 
  migrated 
  

   from 
  the 
  depths 
  to 
  the 
  surface, 
  and 
  leads 
  to 
  the 
  general 
  conclusion 
  

   that 
  joint 
  cracks 
  are 
  the 
  reservoirs 
  and 
  channels 
  of 
  migration 
  of 
  the 
  

   oil 
  in 
  many 
  of 
  the 
  productive 
  strata 
  of 
  this 
  field. 
  

  

  Conclusions 
  regarding 
  future 
  development. 
  — 
  It 
  is 
  obvious 
  from 
  a 
  

   glance 
  at 
  the 
  contour 
  map 
  (PI. 
  X, 
  p. 
  92) 
  and 
  a 
  perusal 
  of 
  the 
  detailed 
  

   description 
  of 
  the 
  developed 
  areas 
  that 
  practically 
  all 
  of 
  the 
  terri- 
  

   tory 
  covered 
  by 
  contour 
  lines 
  is 
  productive. 
  The 
  only 
  part 
  of 
  the 
  

   region 
  about 
  which 
  the 
  compiler 
  of 
  the 
  map 
  has 
  any 
  misgivings 
  as 
  to 
  

   productiveness 
  is 
  that 
  occupying 
  a 
  general 
  synclinal 
  position 
  south 
  

   of 
  the 
  great 
  bend 
  in 
  the 
  Mount 
  Solomon 
  anticline. 
  These 
  misgivings 
  

   are 
  partially 
  alleviated, 
  however, 
  by 
  the 
  idea 
  that 
  probably 
  the 
  

   position 
  of 
  the 
  territory 
  in 
  question 
  on 
  the 
  flanks 
  of 
  Graciosa 
  Ridge, 
  

   which 
  is, 
  broadly, 
  a 
  quaquaversal 
  fold 
  or 
  dome, 
  may 
  exert 
  enough 
  

   control 
  on 
  the 
  oil 
  to 
  cause 
  its 
  collection 
  there 
  at 
  least 
  in 
  paying 
  

   quantities, 
  if 
  not 
  in 
  the 
  remarkable 
  measure 
  found 
  in 
  other 
  parts 
  of 
  

   this 
  field. 
  The 
  region 
  adjacent 
  to 
  the 
  southeast 
  end 
  of 
  the 
  axis 
  of 
  

   the 
  Mount 
  Solomon 
  anticline 
  ought 
  to 
  be 
  productive. 
  The 
  beds 
  on 
  

   the 
  northeastern 
  flank 
  dip 
  more 
  steeply 
  than 
  those 
  on 
  the 
  south- 
  

   western, 
  and 
  the 
  first 
  productive 
  stratum 
  is 
  thought 
  to 
  be 
  at 
  a 
  lower 
  

   horizon 
  in 
  the 
  shale 
  on 
  the 
  former 
  flank 
  than 
  on 
  the 
  latter, 
  so 
  that 
  it 
  

   is 
  probable 
  that 
  the 
  oil 
  zone 
  will 
  be 
  struck 
  at 
  a 
  greater 
  depth 
  from 
  

   the 
  surface 
  northeast 
  of 
  the" 
  anticline 
  than 
  southwest 
  of 
  it. 
  

  

  GATO 
  RIDGE 
  ANTICLINK. 
  

  

  Structure. 
  — 
  The 
  Gato 
  Ridge 
  anticline 
  extends 
  from 
  the 
  top 
  of 
  the 
  

   ridge 
  just 
  east 
  of 
  the 
  mouth 
  of 
  Solomon 
  Canyon 
  to 
  a 
  point 
  some- 
  

   where 
  near 
  the 
  middle 
  of 
  the 
  triangle 
  "formed 
  by 
  Canada 
  de 
  los 
  

   Alisos, 
  Cuaslui 
  Creek, 
  and 
  Foxen 
  Canyon. 
  It 
  follows 
  very 
  closely 
  

  

  