﻿GEOLOGY. 
  

  

  Analyses 
  of 
  Monterey 
  shale. 
  

  

  45 
  

  

  

  

  Diatomaceous 
  shale. 
  

  

  

  Flinty 
  shale. 
  

  

  Lime- 
  

   stone. 
  

  

  

  1. 
  

  

  2. 
  

  

  3. 
  

  

  4. 
  

  

  5. 
  

  

  6. 
  

  

  7. 
  8. 
  

  

  9. 
  

  

  10. 
  

  

  11. 
  

  

  Si02 
  

  

  65.62 
  

  

  72.50 
  

   11.71 
  

  

  2.35 
  

  

  .32 
  

  

  .83 
  

  

  1.88 
  

  

  9.54 
  

  

  83.19 
  

  

  80.59 
  

  

  86.89 
  

   2.32 
  

  

  1.28 
  

  

  1.43 
  

  

  Trace. 
  

   3.58 
  

   4.89 
  

  

  92.88 
  

  

  86.92 
  

   4.27 
  

  

  92. 
  37 
  

   2.46 
  

  

  97.02 
  

  

  98.1 
  

   Not 
  

   det. 
  

   Not 
  

   det. 
  

  

  

  AI2O3 
  

  

  

  Fe203 
  (total 
  iron) 
  

  

  

  

  

  

  CaO 
  

  

  

  

  

  

  1.60 
  

  

  Trace. 
  

  

  2.48 
  

  

  5.13 
  

  

  1.70 
  

  

  

  27 
  86 
  

  

  MgO 
  

  

  

  

  

  

  

  16 
  64 
  

  

  Alkalies 
  (Na 
  2 
  0,K 
  2 
  0). 
  

  

  11.00 
  

  

  

  

  

  

  

  

  Ignition 
  

  

  

  

  2.74+ 
  

   C0 
  2 
  

  

  

  

  

  

  

  

  

  

  

  

  

  99.13 
  

  

  

  

  100. 
  39 
  

  

  

  100.40 
  

  

  99.27 
  

  

  

  

  

  

  

  

  

  

  

  1. 
  Soft, 
  white 
  diatomaceous 
  shale; 
  Purisima 
  Hills, 
  3J 
  miles 
  southwest 
  of 
  Harris, 
  Santa 
  Barbara 
  

   County, 
  Cal. 
  Analyst, 
  W. 
  T. 
  Schaller, 
  1907. 
  

  

  2. 
  Soft, 
  white 
  diatomaceous 
  shale; 
  Graciosa 
  Ridge, 
  3 
  miles 
  southeast 
  of 
  Orcutt, 
  Santa 
  Barbara 
  

   County, 
  Cal. 
  Analyst, 
  W. 
  T. 
  Schaller, 
  1907. 
  Approximate 
  analysis. 
  

  

  3. 
  Soft, 
  white 
  diatomaceous 
  shale; 
  San 
  Julian 
  ranch, 
  at 
  junction 
  of 
  El 
  Jaro 
  and 
  Salsipuedes 
  creeks, 
  

   Santa 
  Barbara 
  County, 
  Cal. 
  Analyst, 
  E. 
  C. 
  Sullivan, 
  1907. 
  

  

  4. 
  Soft, 
  white 
  diatomaceous 
  shale; 
  San 
  Antonio 
  terrace, 
  2 
  miles 
  south 
  of 
  Casmalia, 
  Santa 
  Barbara 
  

   County, 
  Cal. 
  Analyst, 
  E. 
  C. 
  Sullivan, 
  1907. 
  

  

  5. 
  White 
  shale; 
  Monterey, 
  Monterey 
  County, 
  Cal. 
  Lawson, 
  A. 
  C, 
  and 
  Posada, 
  J. 
  de 
  la 
  C, 
  Bull. 
  

   Dept. 
  Geology, 
  Univ. 
  California, 
  vol. 
  1, 
  1893, 
  p. 
  25. 
  Specific 
  gravity, 
  1.8-2.1. 
  

  

  6. 
  Gray, 
  glassy 
  porcelain 
  shale; 
  from 
  same 
  hand 
  specimen 
  as 
  No. 
  4. 
  Analyst, 
  E. 
  C. 
  Sullivan, 
  1907. 
  

  

  7. 
  White 
  porcelain 
  shale; 
  region 
  of 
  Point 
  Sal, 
  Santa 
  Barbara 
  County, 
  Cal. 
  Analyst, 
  H. 
  W. 
  Fair- 
  

   banks, 
  Bull. 
  Dept. 
  Geology, 
  Univ. 
  California, 
  vol. 
  2, 
  No. 
  1, 
  1896, 
  p. 
  12. 
  

  

  8. 
  Opaque 
  flint; 
  Point 
  Sal, 
  Santa 
  Barbara 
  County, 
  Cal. 
  Analyst, 
  H. 
  W. 
  Fairbanks, 
  loc. 
  cit. 
  

  

  9. 
  Hard, 
  black, 
  clear 
  flint; 
  1J 
  miles 
  west 
  of 
  Zaca, 
  Santa 
  Barbara 
  County, 
  Cal. 
  Analyst, 
  E. 
  C. 
  Sulli- 
  

   van, 
  1907. 
  

  

  10. 
  Hard, 
  black, 
  clear 
  flint; 
  Point 
  Sal, 
  Santa 
  Barbara 
  County, 
  Cal. 
  Analyst, 
  H. 
  W. 
  Fairbanks, 
  loc. 
  

   cit. 
  

  

  11. 
  Bituminous 
  limestone; 
  Bedrock 
  Mountain, 
  northeast 
  of 
  Lompoc, 
  Santa 
  Barbara 
  County, 
  Cal. 
  

   Analyst, 
  George 
  Steiger, 
  1907. 
  

  

  ALTERATION. 
  

  

  The 
  differences 
  in. 
  character 
  and 
  composition 
  between 
  the 
  soft 
  and 
  

   hard 
  varieties 
  of 
  the 
  Monterey 
  shale 
  have 
  been 
  brought 
  out 
  in 
  the 
  

   foregoing 
  discussion. 
  The 
  question 
  arises, 
  To 
  what 
  are 
  these 
  differ- 
  

   ences 
  due 
  ? 
  It 
  is 
  difficult 
  to 
  give 
  a 
  decisive 
  answer. 
  The 
  main 
  differ- 
  

   ences 
  in 
  the 
  gradations 
  from 
  the 
  soft 
  to 
  the 
  hard 
  shales 
  lie 
  in 
  the 
  

   siliceousness, 
  compactness, 
  hardness, 
  and 
  .degree 
  of 
  crystallization. 
  

   Taken 
  as 
  a 
  whole 
  the 
  lower 
  division 
  is 
  made 
  up 
  largely 
  of 
  hard 
  shale 
  

   and 
  the 
  upper 
  of 
  soft 
  shale, 
  but 
  gradations 
  from 
  one 
  variety 
  to 
  

   another 
  within 
  an 
  extremely 
  small 
  space 
  occur 
  in 
  both 
  divisions. 
  

   In 
  some 
  places 
  a 
  thick 
  series 
  of 
  beds 
  of 
  similar 
  character 
  is 
  marked 
  

   off 
  from 
  a 
  series 
  of 
  different 
  character. 
  Elsewhere 
  a 
  variation 
  occurs 
  

   bed 
  by 
  bed, 
  or, 
  in 
  still 
  other 
  places, 
  a 
  single* 
  bed 
  or 
  lens 
  of 
  shale 
  of 
  

   one 
  variety 
  is 
  included 
  within 
  another 
  kind. 
  The 
  softer 
  varieties 
  

   contain 
  at 
  many 
  points 
  small 
  lenses 
  of 
  hard, 
  brittle, 
  or 
  semiflinty 
  

   shale 
  elongated 
  parallel 
  with 
  the 
  bedding, 
  or 
  strata 
  in 
  which 
  lenses 
  

   are 
  strung 
  along 
  at 
  irregular 
  intervals, 
  or 
  single 
  small 
  beds 
  com- 
  

   posed 
  entirely 
  of 
  harder 
  material. 
  In 
  such 
  occurrences 
  there 
  seems 
  

   to 
  be 
  a 
  gradation 
  from 
  one 
  variety 
  to 
  the 
  other, 
  and 
  the 
  outlines 
  

   of 
  the 
  hard 
  layers 
  are 
  not 
  regular 
  or 
  very 
  definite. 
  For 
  example, 
  

   the 
  diatom-bearing 
  shale 
  of 
  chemical 
  analysis 
  No. 
  4 
  and 
  the 
  glassy 
  

   1784^Bull— 
  322— 
  07 
  £ 
  

  

  