﻿274 
  Lindgren 
  — 
  Granodiorite 
  and 
  other 
  intermediate 
  rocks. 
  

   B. 
  Table 
  of 
  Partial 
  Analyses 
  of 
  Granodiorites. 
  

  

  

  I 
  

  

  II 
  

  

  III 
  

  

  IV 
  

  

  Y 
  

  

  YI 
  

  

  YII 
  

  

  VIII 
  

  

  IX 
  

  

  Si0 
  2 
  

  

  CaO 
  

  

  K 
  2 
  _. 
  

  

  Na 
  2 
  

  

  59-48 
  

   6-50 
  

   2-27 
  

   3-51 
  

  

  63-54 
  

   6-11 
  

   191 
  

   2 
  97 
  

  

  62 
  17 
  

   5-80 
  

   2-23 
  

  

  2-86 
  

  

  5-64 
  

  

  1-18 
  

   3-74 
  

  

  564 
  

   1-18 
  

   374 
  

  

  541 
  

   1-82 
  

   3 
  15 
  

  

  5-37 
  

   1-60 
  

   3-81 
  

  

  65-54 
  

   4-88 
  

   1-95 
  

   4-09 
  

  

  63-85 
  

   4-76 
  

   3'<>8 
  

   3-29 
  

  

  

  X 
  

  

  XI 
  

  

  XII 
  

  

  XIII 
  

  

  XIV 
  

  

  XV 
  

  

  XVI 
  

  

  XVII 
  

  

  Si0 
  2 
  

  

  66-65 
  

   4 
  53 
  

   265 
  

   3 
  40 
  

  

  65-88 
  

   4-1 
  L 
  

   2-88 
  

   241 
  

  

  67-14 
  

   4-07 
  

   2-70 
  

   309 
  

  

  66-40 
  

   405 
  

   2-08 
  

   4-49 
  

  

  68-13 
  

   3-51 
  

   3 
  58 
  

   3-13 
  

  

  67-45 
  

   360 
  

   3-66 
  

   3 
  47 
  

  

  68-32 
  

   3-21 
  

   3 
  3.7 
  

   2-51 
  

  

  69-85 
  

  

  CaO 
  \ 
  

  

  K 
  2 
  

  

  308 
  

   •2-28 
  

  

  Na 
  2 
  

  

  1 
  13 
  

  

  

  

  Localities 
  of 
  Specimens 
  in 
  Table 
  B. 
  

   I. 
  398 
  Placer 
  Co 
  . 
  Donner 
  Pass, 
  Truckee 
  Folio. 
  Geo. 
  Steiger 
  analyst. 
  

   II. 
  225 
  Nevada 
  Co., 
  2 
  miles 
  S. 
  of 
  Faucherie 
  Lake, 
  Colfax 
  Folio, 
  Geo. 
  Steiger 
  

   analyst. 
  

  

  III. 
  221 
  Nevada 
  Co.. 
  1 
  mile 
  S. 
  W. 
  of 
  Faucherie 
  Lake, 
  Colfax 
  Folio, 
  Geo. 
  

   Steiger 
  analyst. 
  

  

  IV. 
  338 
  El 
  Dorado 
  Co 
  , 
  1^ 
  mi. 
  S. 
  of 
  Fairplay. 
  Placcrville 
  Folio, 
  W. 
  H. 
  Melville 
  

   analyst. 
  

  

  V. 
  293 
  Placer 
  Co., 
  Penryn, 
  Sacramento 
  Folio, 
  W. 
  H. 
  Melville 
  analyst. 
  

   VI. 
  305 
  El 
  Dorado 
  Co. 
  Point 
  between 
  Soldier 
  Creek 
  and 
  South 
  Fork 
  of 
  

   American 
  River, 
  Placerville 
  Folio, 
  W. 
  H. 
  Melville 
  analyst. 
  

   VII. 
  104 
  El 
  Dorado 
  Co 
  White 
  Rock 
  Cr., 
  Placerville, 
  Placerville 
  Folio, 
  W. 
  H. 
  

  

  Melville 
  analyst. 
  

   VIII. 
  Lincoln, 
  Placer 
  Co., 
  Sacramento 
  Folio, 
  W. 
  F. 
  Hillebrand 
  analyst. 
  

   IX. 
  Nevada 
  City. 
  Nevada 
  Co., 
  Smartsville 
  Folio, 
  W. 
  F. 
  Hillebrand 
  analyst. 
  

   X. 
  Grass 
  Valley, 
  Nevada 
  Co., 
  Smartsville 
  Folio, 
  W. 
  F. 
  Hillebrand 
  analyst. 
  

   XL 
  177 
  Pyramid 
  Pk., 
  Meeks 
  Creek, 
  Lake 
  Tahoe, 
  Truckee 
  Folio, 
  Geo. 
  Steiger 
  

   analyst. 
  

   XII. 
  86 
  Pyramid 
  Pk., 
  Rockbound 
  Lake, 
  Truckee 
  Folio, 
  Geo. 
  Steiger 
  analyst. 
  

  

  XIII. 
  El 
  Capitan, 
  Yosemite, 
  CI. 
  King. 
  

  

  XIV. 
  69 
  Pyramid 
  Pk., 
  1^ 
  mi. 
  S. 
  of 
  Rubicon 
  Point, 
  Truckee 
  Folio, 
  Geo. 
  Steiger 
  

   analyst. 
  

  

  XV. 
  103 
  Pvramid 
  Pk., 
  Silver 
  Lake, 
  Pyramid 
  Pk. 
  Folio, 
  Geo. 
  Steiger 
  analyst. 
  

   XVI. 
  120 
  Pyramid 
  Pk., 
  Big 
  Mud 
  Lake, 
  Pyramid 
  Pk. 
  Folio, 
  Geo. 
  Steiger 
  

   analyst. 
  

   XVII. 
  231 
  Nevada 
  Co., 
  Rattlesnake 
  Cr., 
  2 
  m. 
  N. 
  E. 
  of 
  Cisco, 
  Truckee 
  Folio. 
  

   Geo. 
  Steiger 
  analyst. 
  

  

  Characteristic 
  features 
  and 
  limits 
  of 
  granodiorite. 
  — 
  Under 
  

   the 
  term 
  granodiorite 
  are 
  included 
  light-colored 
  granular 
  rocks, 
  

   composed 
  of 
  quartz, 
  oligoclase 
  or 
  andesine, 
  orthoclase, 
  biotite 
  

   or 
  hornblende 
  or 
  both, 
  titanite, 
  magnetite, 
  apatite 
  and 
  zircon. 
  

   The 
  average 
  grain 
  ranges 
  from 
  1 
  to 
  4 
  mm 
  , 
  but 
  certain 
  of 
  the 
  min- 
  

   erals 
  sometimes 
  considerably 
  exceed 
  this. 
  Thus 
  the 
  hornblende 
  

   prisms 
  are 
  often 
  10 
  mm 
  long 
  and 
  those 
  of 
  orthoclase 
  may 
  be 
  still 
  

   larger. 
  The 
  fresh 
  outcrops 
  are 
  brilliantly 
  grayish 
  white, 
  and 
  

   even 
  when 
  decomposed 
  the 
  amount 
  of 
  ferric 
  oxide 
  set 
  free 
  is 
  

   rarely 
  sufficient 
  to 
  impart 
  a 
  red 
  color 
  to 
  the 
  rock. 
  

  

  In 
  thin 
  section 
  the 
  structure 
  is 
  typically 
  hypidiomorphic. 
  

   The 
  biotite 
  and 
  hornblende 
  are 
  sometimes, 
  the 
  soda-lime 
  felds- 
  

  

  