﻿GEOLOGY 
  OF 
  WASHINGTON, 
  WARREN 
  COUNTIES, 
  ETC. 
  547 
  

  

  west 
  bank 
  of 
  the 
  river, 
  and 
  indeed 
  it 
  is 
  not 
  certain 
  that 
  any 
  

   actually 
  outcrop 
  in 
  Luzerne, 
  but 
  as 
  systematic 
  work 
  has 
  not 
  yet 
  

   been 
  undertaken 
  in 
  Corinth 
  our 
  observations 
  are- 
  recorded 
  here. 
  

  

  The 
  most 
  northerly 
  exposure 
  is 
  under 
  the 
  west 
  end 
  of 
  the 
  

   bridge 
  over 
  the 
  Hudson 
  at 
  Corinth. 
  About 
  24 
  feet 
  of 
  Potsdam 
  

   are 
  exposed. 
  The 
  lowest 
  eight 
  feet 
  contains 
  some 
  slaty 
  layers, 
  

   the 
  next 
  eight 
  feet 
  is 
  a 
  dark 
  gray, 
  slightly 
  calcareous 
  quartzite, 
  

   resembling 
  limestone 
  and 
  having 
  some 
  shaly 
  layers. 
  The 
  upper- 
  

   most 
  eight 
  feet 
  are 
  quartzite. 
  A 
  hundred 
  feet 
  below 
  the 
  bridge 
  

   there 
  are 
  six 
  feet 
  of 
  conglomerate 
  quartzite 
  resting 
  on 
  gneiss 
  

   and 
  evidently 
  a 
  basal 
  conglomerate. 
  500 
  feet 
  below 
  the 
  

   bridge 
  50 
  to 
  60 
  feet 
  of 
  Potsdam, 
  with 
  a 
  low 
  northerly 
  dip, 
  are 
  

   exposed. 
  On 
  the 
  quartzite 
  is 
  sand 
  of 
  series 
  6 
  with 
  boulders 
  

   of 
  gneiss. 
  These 
  exposures 
  of 
  Potsdam 
  have 
  been 
  noted 
  briefly 
  

   by 
  N. 
  H. 
  Darton. 
  a 
  The 
  outlier 
  of 
  Calciferous 
  at 
  Schroon 
  Lake 
  

   postomce 
  about 
  40 
  miles 
  farther 
  north, 
  gives 
  some 
  ground 
  for 
  

   thinking 
  that 
  paleozoics 
  formerly 
  extended 
  much 
  farther 
  in 
  this 
  

   direction. 
  6 
  

  

  No 
  trap 
  dikes 
  of 
  series 
  5 
  were 
  found. 
  The 
  glacial 
  drift 
  is 
  

   widespread, 
  and 
  interesting 
  terraces 
  were 
  noted 
  along 
  the 
  river. 
  

   No 
  striae 
  were 
  recorded. 
  

  

  ESSEX 
  CO. 
  i 
  

  

  Minerva 
  

   Some 
  observations 
  have 
  been 
  made 
  in 
  Minerva 
  in 
  order 
  to 
  fill 
  

   out 
  the 
  gap 
  left 
  in 
  the 
  map 
  that 
  was 
  issued 
  in 
  the 
  report 
  for 
  

   1895, 
  p. 
  602, 
  plate 
  9. 
  As 
  there 
  given 
  the 
  northwestern 
  corner 
  of 
  

   the 
  town 
  was 
  not 
  colored 
  in. 
  Mr 
  Newland 
  has 
  been 
  over 
  parts 
  of 
  

   it 
  and 
  has 
  visited 
  the 
  neighboring 
  townships 
  north 
  and 
  west. 
  

   There 
  is 
  no 
  question 
  that 
  the 
  country 
  rock 
  is 
  gneiss, 
  but 
  there 
  

   may 
  be 
  crystalline 
  limestone 
  areas 
  and 
  outcrops 
  of 
  gabbro 
  in 
  it 
  

   that 
  we 
  have 
  not 
  noted. 
  The 
  gneiss 
  is 
  the 
  Whitehall 
  type. 
  It 
  is 
  

   prevailingly 
  gray 
  to 
  greenish 
  and 
  contains 
  quartz, 
  microperthite, 
  

   plagioclase, 
  hypersthene, 
  and 
  often 
  hornblende 
  and 
  green 
  augite. 
  

   Zircons 
  and 
  pyrrhotite 
  are 
  the 
  chief 
  accessory 
  minerals. 
  Granula- 
  

  

  a 
  Report 
  of 
  the 
  state 
  geologist. 
  1893. 
  p, 
  410. 
  

  

  b 
  J. 
  F. 
  Kemp. 
  Physiography 
  of 
  the 
  eastern 
  Adirondack^ 
  in 
  the 
  Cambriau 
  and 
  Ordovician 
  periods. 
  

   Bull. 
  geol. 
  soc. 
  Amer. 
  8:408-12. 
  

  

  