﻿GEOLOGY 
  OF 
  WASHINGTON, 
  WARREN 
  COUNTIES, 
  ETC. 
  545 
  

  

  Series 
  3. 
  One 
  outcrop 
  of 
  the 
  usual 
  dark 
  gabbro 
  was 
  discovered. 
  

   It 
  was 
  found 
  at 
  the 
  bridge 
  over 
  the 
  creek 
  on 
  the 
  road 
  from 
  Stony- 
  

   creek 
  Station 
  to 
  Stony 
  Creek 
  Center 
  (or 
  postoffice), 
  specimeu 
  

   203. 
  It 
  is 
  the 
  usual 
  gabbro. 
  

  

  Series 
  4 
  and 
  5 
  were 
  not 
  found. 
  Of 
  Series 
  6, 
  the 
  glacial 
  drift 
  is 
  

   widespread 
  and 
  terraces 
  along 
  the 
  creeks 
  are 
  sometimes 
  striking. 
  

   On 
  Stony 
  Creek, 
  two 
  or 
  three 
  miles 
  below 
  Harrisburg, 
  three 
  may 
  

   be 
  observed, 
  for 
  whose 
  correlation 
  with 
  others, 
  topographic 
  

   maps 
  will 
  be 
  needed. 
  No 
  glacial 
  scratches 
  were 
  noted. 
  

  

  Hadley 
  

  

  Hadley 
  is 
  a 
  comparatively 
  small 
  township, 
  that 
  lies 
  along 
  the 
  

   west 
  bank 
  of 
  the 
  Hudson 
  at 
  the 
  southern 
  boundary 
  of 
  the 
  county. 
  

   The 
  Sacondaga 
  river 
  enters 
  the 
  Hudson 
  from 
  the 
  west, 
  dividing 
  

   the 
  southern 
  third 
  from 
  the 
  northern 
  two 
  thirds 
  of 
  the 
  town. 
  

  

  Series 
  1. 
  All 
  the 
  ledges 
  that 
  were 
  noted 
  in 
  Hadley 
  are 
  gneiss. 
  

   No. 
  205, 
  from 
  the 
  area 
  north 
  of 
  the 
  Sacondaga, 
  is 
  a 
  well-foliated 
  

   feldspathic 
  representative 
  of 
  the 
  Whitehall 
  type. 
  It 
  contains 
  

   microperthitic 
  orthoclase, 
  plagioclase, 
  deep 
  brown 
  hornblende, 
  

   and 
  considerable 
  quartz. 
  Garnets 
  are 
  visible 
  to 
  the 
  eye, 
  and 
  

   extensive 
  granulation 
  has 
  been 
  caused 
  by 
  pressure. 
  No. 
  217, 
  

   from 
  the 
  extreme 
  south 
  is 
  a 
  very 
  finely 
  foliated 
  variety, 
  and 
  one 
  

   that 
  has 
  been 
  so 
  excessively 
  crushed 
  as 
  to 
  resemble 
  a 
  compact 
  

   quartzite. 
  In 
  thin 
  section 
  some 
  plagioclase 
  and 
  some 
  orthoclase 
  

   are 
  present, 
  and 
  more 
  or 
  less 
  biotite, 
  but 
  the 
  chief 
  mineral 
  is 
  

   quartz. 
  

  

  Series 
  2, 
  3, 
  4 
  and 
  5 
  were 
  not 
  observed. 
  

  

  Of 
  series 
  6 
  the 
  glacial 
  drift 
  is 
  widespread 
  and 
  is 
  often 
  water- 
  

   sorted. 
  The 
  terraces 
  so 
  often 
  observed 
  in 
  this 
  county 
  are 
  beau- 
  

   tifully 
  developed. 
  Along 
  the 
  Sacondaga 
  river, 
  between 
  Conk- 
  

   lingville 
  and 
  Hadley 
  village, 
  two 
  respectively 
  30 
  and 
  60 
  feet 
  above 
  

   the 
  river, 
  are 
  striking 
  features 
  of 
  the 
  local 
  geology. 
  

  

  Attempts 
  at 
  gold-mining 
  have 
  been 
  made 
  upon 
  the 
  gravels 
  

   along 
  the 
  Sacondaga 
  about 
  one 
  and 
  one 
  half 
  miles 
  west 
  of 
  Had- 
  

   ley. 
  A 
  stamp-mill 
  has 
  been 
  erected, 
  but 
  no 
  disinterested 
  assays 
  

   of 
  the 
  gravel 
  are 
  available. 
  

  

  