﻿GEOLOGY 
  OF 
  WASHINGTON, 
  WARREN 
  COUNTIES, 
  ETC. 
  525 
  

  

  should 
  be 
  determined 
  in 
  this 
  way. 
  Somewhat 
  similar 
  rocks 
  

   have 
  been 
  noted 
  in 
  other 
  localities 
  where 
  there 
  were 
  crystalline 
  

   limestones, 
  and 
  it 
  is 
  possible 
  that 
  the 
  two 
  may 
  go 
  together. 
  

  

  The 
  granitic 
  gneisses 
  and 
  their 
  associated 
  quartzose 
  rocks 
  form 
  

   the 
  chief 
  part 
  of 
  the 
  high 
  ridge 
  of 
  crystallines 
  and 
  extend 
  south 
  

   into 
  Fort 
  Ann. 
  

  

  Series 
  2. 
  The 
  crystalline 
  limestones 
  have 
  been 
  found 
  in 
  four 
  

   different 
  places. 
  Three 
  lie 
  at 
  the 
  north 
  end 
  of 
  the 
  metamorphic 
  

   area 
  and 
  one 
  in 
  the 
  extreme 
  southwest 
  corner 
  of 
  the 
  town. 
  There 
  

   probably 
  are 
  others 
  back 
  on 
  the 
  ridge, 
  which 
  to 
  the 
  southwest 
  

   has 
  been 
  but 
  imperfectly 
  traversed 
  by 
  us. 
  The 
  most 
  northern 
  

   exposure 
  (See 
  the 
  special 
  map 
  of 
  Whitehall 
  village, 
  spec. 
  91) 
  is 
  

   the 
  thickest. 
  It 
  was 
  estimated 
  to 
  be 
  300-400 
  feet 
  across 
  by 
  

   Mr 
  Newland, 
  is 
  charged 
  with 
  silicates 
  and 
  apparently 
  conformably 
  

   inclosed 
  between 
  the 
  gneisses 
  below 
  and 
  an 
  overlying 
  bed, 
  sup- 
  

   posed 
  to 
  be 
  a 
  quartzite. 
  The 
  exposure 
  at 
  96 
  is 
  a 
  small 
  one, 
  and 
  

   that 
  on 
  the 
  crest 
  of 
  the 
  ridge 
  at 
  the 
  intersection 
  of 
  the 
  two 
  cross- 
  

   sections 
  is 
  likewise 
  thin. 
  We 
  can 
  not 
  state 
  positively 
  whether 
  

   we 
  have 
  the 
  last-named 
  one 
  located 
  exactly 
  right 
  on 
  the 
  map, 
  

   though 
  it 
  is 
  not 
  far 
  from 
  its 
  true 
  position. 
  The 
  minor 
  hillocks 
  on 
  

   the 
  summit 
  of 
  the 
  ridge 
  do 
  not 
  correspond 
  with 
  the 
  contours 
  as 
  

   drawn 
  on 
  the 
  Whitehall 
  sheet, 
  as 
  the 
  latter 
  have 
  been 
  sketched 
  

   from 
  a 
  distance 
  and 
  are 
  general 
  in 
  their 
  character. 
  While 
  a 
  road 
  

   is 
  drawn 
  as 
  crossing 
  the 
  ridge, 
  that 
  might 
  seem 
  to 
  be 
  available 
  

   as 
  a 
  point 
  of 
  departure 
  in 
  orienting 
  oneself, 
  yet 
  the 
  ridge 
  is 
  

   traversed 
  by 
  many 
  wood-roads, 
  quite 
  as 
  good 
  as 
  this 
  one 
  and 
  

   both 
  of 
  the 
  writers 
  were 
  much 
  at 
  a 
  loss 
  in 
  plotting 
  the 
  geology. 
  

   A. 
  thin 
  stratum 
  of 
  white 
  crystalline 
  limestone 
  does 
  exist 
  however, 
  

   and 
  is 
  encompassed 
  in 
  metamorphic 
  siliceous 
  rocks. 
  The 
  stratum 
  

   was 
  about 
  6 
  feet 
  thick 
  and 
  conformably 
  included 
  in 
  the 
  gneiss, 
  so 
  

   far 
  as 
  one 
  could 
  judge. 
  

  

  Series 
  3. 
  Four 
  exposures 
  of 
  gabbro 
  have 
  been 
  met, 
  all 
  greatly 
  

   compressed, 
  gneissoid 
  in 
  structure 
  and 
  black 
  in 
  color. 
  One 
  

   outcrop 
  appears 
  in 
  the 
  railway 
  cuts 
  just 
  north 
  of 
  Whitehall. 
  

   The 
  rock 
  in 
  thin 
  section 
  is 
  a 
  norite, 
  with 
  abundant 
  hypersthene, 
  

   now 
  granulated 
  by 
  dynamic 
  metamorphism 
  (spec. 
  67). 
  The 
  gab- 
  

  

  