﻿94 
  SANTA 
  MARIA 
  OIL 
  DISTRICT, 
  CALIFORNIA. 
  

  

  more 
  or 
  less 
  in 
  thickness, 
  composition, 
  and 
  yield 
  from 
  well 
  to 
  well. 
  

   The 
  most 
  persistent 
  zone 
  in 
  that 
  part 
  of 
  the 
  held 
  which 
  is 
  best 
  

   developed 
  at 
  the 
  present 
  time 
  is 
  the 
  second, 
  or 
  B 
  zone. 
  Above 
  

   this 
  in 
  many 
  of 
  the 
  wells 
  is 
  zone 
  A; 
  in 
  others 
  zone 
  C 
  is 
  penetrated 
  

   below 
  it. 
  The 
  upper 
  zone 
  in 
  the 
  eastern 
  group 
  of 
  Western 
  Union 
  

   wells, 
  although 
  above 
  what 
  is 
  supposed 
  to 
  be 
  the 
  horizon 
  of 
  B, 
  is 
  

   probably 
  considerably 
  above 
  the 
  A 
  zone 
  of 
  the 
  northern 
  part 
  of 
  the 
  

   held, 
  where 
  it 
  appears 
  to 
  have 
  no 
  correlative. 
  

  

  With 
  the 
  exception 
  of 
  the 
  lowest 
  zone 
  in 
  the 
  wells 
  in 
  the 
  eastern 
  

   part 
  of 
  the 
  field 
  and 
  of 
  a 
  few 
  others 
  mentioned 
  in 
  the 
  detailed 
  dis- 
  

   cussion 
  of 
  the 
  local 
  areas, 
  the 
  oil 
  zones 
  appear 
  to 
  represent 
  fractured 
  

   portions 
  of 
  the 
  shales, 
  the 
  interstices 
  in 
  the 
  breccia 
  or 
  possibly 
  joint 
  

   cracks 
  in 
  the 
  beds 
  being 
  the 
  reservoirs 
  for 
  the 
  storage 
  of 
  the 
  oil. 
  

   The 
  exceptions 
  to 
  the 
  brecciated 
  productive 
  zones 
  are 
  apparently 
  

   typical 
  sands 
  and 
  gravels. 
  

  

  HALL-HOBBS 
  RICE 
  RANCH 
  AREA 
  

   LOCATION 
  AND 
  STRUCTURE. 
  

  

  The 
  area 
  here 
  discussed 
  comprises 
  the 
  California 
  Coast, 
  Meridian, 
  

   Coblentz, 
  Santa 
  Maria 
  Oil 
  Company 
  (Keyser), 
  Hall 
  & 
  Hall, 
  New- 
  

   Pennsylvania, 
  Rice 
  ranch, 
  and 
  Dome 
  properties 
  and 
  the 
  north- 
  

   eastern 
  part 
  of 
  the 
  Hobbs 
  lease, 
  and 
  occupies 
  the 
  ridges 
  and 
  canyons 
  

   which 
  extend 
  northward 
  from 
  the 
  east 
  end 
  of 
  the 
  main 
  Graciosa 
  

   Ridge. 
  The 
  wells 
  are 
  located 
  on 
  the 
  northwestern 
  flank 
  of 
  the 
  

   Mount 
  Solomon 
  anticline, 
  at 
  or 
  immediately 
  northwest 
  of 
  the 
  ter- 
  

   ritory, 
  in 
  which 
  it 
  swings 
  from 
  a 
  northeastward 
  to 
  a 
  southeastward 
  

   trend. 
  In 
  addition 
  to 
  the 
  main 
  anticline 
  there 
  appear 
  to 
  be 
  one 
  or 
  

   more 
  local 
  flexures 
  involved, 
  in 
  the 
  structure 
  of 
  the 
  field, 
  the 
  Hobbs 
  

   anticline 
  and 
  the 
  syncline 
  between 
  it 
  and 
  the 
  Mount 
  Solomon 
  anticline 
  

   being 
  the 
  most 
  prominent. 
  The 
  characteristics 
  and 
  extent 
  of 
  these 
  

   features 
  as 
  they 
  are 
  believed 
  to 
  exist 
  are 
  portrayed 
  on 
  the 
  contour 
  

   map 
  (PI. 
  X). 
  

  

  GEOLOGY 
  OF 
  THE 
  WELLS. 
  

  

  Nearly 
  all 
  the 
  wells 
  in 
  this 
  area, 
  with 
  the 
  exception 
  of 
  the 
  Hall, 
  

   Meridian, 
  and 
  Coblentz 
  start 
  down 
  in 
  the 
  Monterey 
  shale. 
  Those 
  

   farthest 
  away 
  from 
  the 
  top 
  of 
  the 
  ridge, 
  other 
  things 
  being 
  equal, 
  

   have 
  to 
  penetrate 
  farthest 
  through 
  the 
  Fernando 
  clay, 
  sand, 
  and 
  

   conglomerate. 
  Up 
  to 
  the 
  present 
  time 
  the 
  greatest 
  thickness 
  of 
  the 
  

   Fernando 
  penetrated 
  before 
  "reaching 
  the 
  shale 
  is 
  650 
  feet, 
  and 
  much 
  

   trouble 
  was 
  experienced 
  in 
  going 
  through 
  it 
  in 
  this 
  well, 
  the 
  forma- 
  

   tion 
  being 
  mostly 
  sand. 
  From 
  the 
  top 
  of 
  the 
  Monterey 
  shale 
  to 
  the 
  

   bottom 
  of 
  the 
  wells 
  the 
  rocks 
  are 
  largely 
  blue 
  and 
  brown 
  shales, 
  

   with 
  only 
  here 
  and 
  there 
  interbedded 
  hard 
  "shell" 
  layers. 
  In 
  fact, 
  

  

  