﻿142 
  C. 
  D. 
  Walcott 
  — 
  Lower 
  Cambrian 
  Rocks 
  in 
  California. 
  

  

  on 
  Inyo 
  County 
  Mr. 
  W. 
  A. 
  Goodyear, 
  who 
  was 
  an 
  assistant 
  in 
  

   the 
  State 
  Survey 
  under 
  Prof. 
  J. 
  D. 
  Whitney, 
  speaks 
  of 
  the 
  

   Inyo 
  and 
  White 
  Mountain 
  ranges 
  as 
  a 
  part 
  of 
  the 
  great 
  Paleo- 
  

   zoic 
  formation 
  which 
  occupies 
  so 
  extensive 
  an 
  area 
  in 
  the 
  

   Great 
  Basin. 
  He 
  also 
  describes,* 
  in 
  the 
  form 
  of 
  an 
  itinerary, 
  

   a 
  geological 
  exploration 
  of 
  parts 
  of 
  the 
  range, 
  noting 
  the 
  occur- 
  

   rence 
  of 
  various 
  stratified 
  rocks 
  and 
  granites. 
  

  

  During 
  the 
  summer 
  of 
  1894, 
  accompanied 
  by 
  Mr. 
  F. 
  B. 
  

   Weeks, 
  I 
  crossed 
  the 
  range 
  over 
  the 
  toll-road 
  leading 
  from 
  

   Big 
  Pine 
  to 
  Piper's 
  ranch, 
  in 
  Fish 
  Lake 
  Valley, 
  and 
  penetrated 
  

   into 
  it 
  from 
  the 
  western 
  side 
  in 
  Waucobi, 
  Black 
  and 
  Silver 
  

   canyons. 
  

  

  The 
  ascending 
  section 
  exposed 
  in 
  the 
  ridge 
  on 
  the 
  north 
  side 
  

   of 
  Black 
  Canyon 
  is 
  as 
  follows 
  : 
  

  

  1. 
  Gray 
  and 
  yellowish, 
  arenaceous 
  limestone, 
  occurring 
  

  

  in 
  low 
  hills 
  above 
  the 
  Quaternary 
  200 
  ft. 
  

  

  2. 
  Massive, 
  bedded, 
  compact, 
  fine-grained, 
  often 
  saccha- 
  

  

  roidal, 
  light-gray, 
  siliceous 
  and 
  arenaceous 
  limestone 
  

  

  (strike 
  K 
  10° 
  W. 
  mag., 
  dip 
  20° 
  E.). 
  

   At 
  100 
  feet 
  from 
  base 
  of 
  this 
  division 
  a 
  dike 
  of 
  basalt 
  

  

  40 
  feet 
  in 
  thickness 
  cuts 
  through 
  and 
  displaces 
  the 
  

  

  limestone 
  in 
  the 
  vicinity 
  of 
  the 
  dike, 
  so 
  as 
  to 
  give 
  it 
  

  

  a 
  dip 
  of 
  from 
  70° 
  to 
  80 
  6 
  E, 
  Above 
  the 
  dike 
  the 
  dip 
  

  

  of 
  20° 
  is 
  very 
  quickly 
  resumed. 
  

   At 
  160 
  feet 
  from 
  the 
  base 
  a 
  band 
  of 
  white 
  limestone 
  

  

  occurs, 
  which 
  contains 
  numerous 
  small 
  concretions 
  

  

  of 
  limestone. 
  

   At 
  230 
  feet 
  above 
  the 
  dike 
  occurs 
  a 
  band 
  of 
  shaly 
  

  

  limestone, 
  which 
  has 
  buff-colored 
  partings 
  ; 
  and 
  

  

  irregular, 
  buff-colored, 
  sandy 
  laminations 
  occur 
  in 
  

  

  thin 
  layers 
  in 
  the 
  thick-bedded 
  limestone. 
  

   No. 
  2 
  may 
  be 
  subdivided 
  as 
  follows: 
  

  

  a. 
  Light-gray 
  and 
  white 
  limestone 
  500 
  ft. 
  

  

  b. 
  Buff 
  and 
  gray, 
  more 
  arenaceous 
  limestone, 
  

  

  with 
  a 
  band 
  of 
  cherty 
  limestone 
  20-25 
  feet 
  

  

  thick 
  at 
  125 
  feet 
  from 
  its 
  base 
  170ft. 
  

  

  c. 
  Gray, 
  arenaceous 
  limestone, 
  cherty 
  at 
  top_. 
  115 
  ft. 
  

  

  d. 
  Shaly 
  and 
  thick-bedded, 
  sandy 
  limestone, 
  

  

  cross-bedded 
  in 
  places, 
  with 
  yellowish-buff 
  

   layers, 
  also 
  with 
  two 
  bands 
  of 
  brown, 
  

   thick-bedded 
  and 
  shaly 
  quartzite__ 
  145 
  ft. 
  

  

  e. 
  Massive, 
  bedded, 
  coarse, 
  arenaceous, 
  gray 
  

  

  limestone, 
  passing 
  into 
  buff-colored 
  and 
  

   cherty 
  beds 
  above 
  85 
  ft. 
  

  

  f 
  . 
  Buff-colored, 
  shaly 
  limestone 
  _ 
  5 
  ft. 
  

  

  g. 
  Bluish-gray, 
  banded 
  limestone 
  30 
  ft. 
  

  

  * 
  Loc. 
  cit., 
  p. 
  290. 
  

  

  

  