﻿Report 
  of 
  the 
  State 
  Geologist. 
  607 
  

  

  are 
  finely 
  represented 
  by 
  100 
  feet 
  of 
  gray 
  to 
  buff 
  quartzitic 
  slabby 
  

   sandstones 
  with 
  a 
  few 
  inches 
  of 
  conglomeratic 
  quartzite 
  at 
  its 
  base. 
  

   The 
  contact 
  with 
  the 
  crystalline 
  rocks 
  is 
  plainly 
  exposed 
  along 
  the 
  

   road 
  side 
  and 
  the 
  relations 
  are 
  markedly 
  different 
  from 
  those 
  in 
  

   the 
  exposure 
  near 
  Mosherville 
  in 
  the 
  absence 
  of 
  heavy 
  conglom- 
  

   erate 
  and 
  a 
  relative 
  smooth 
  surface 
  of 
  crystalline 
  rocks. 
  Here 
  

   we 
  probably 
  have 
  deposits 
  laid 
  down 
  at 
  some 
  distance 
  from 
  the 
  

   shore 
  in 
  relatively 
  quiet 
  waters. 
  South 
  of 
  this 
  small 
  inclosed 
  

   crystalline 
  rock 
  area 
  the 
  Potsdam 
  beds 
  appear 
  to 
  be 
  cut 
  off 
  by 
  

   the 
  branch 
  of 
  the 
  Hoffman's 
  Ferry 
  fault, 
  as 
  explained 
  elsewhere. 
  

  

  The 
  Hoffman's 
  Ferry 
  fault 
  brings 
  up 
  Potsdam 
  sandstones 
  west 
  

   of 
  Galway, 
  which 
  are 
  well 
  exposed 
  in 
  the 
  slope 
  of 
  the 
  fault 
  scarp 
  

   on 
  the 
  road 
  to 
  West 
  Galway. 
  They 
  are 
  gray, 
  slabby 
  sandstones, 
  

   more 
  or 
  less 
  quartzitic, 
  and 
  a 
  thickness 
  of 
  about 
  eighty 
  feet 
  is 
  

   seen 
  from 
  the 
  bottom 
  of 
  the 
  valley 
  to 
  the 
  crest 
  of 
  the 
  hill. 
  

   Typical 
  Calciferous 
  outcrops 
  are 
  found 
  a 
  short 
  distance 
  west. 
  

  

  There 
  are 
  small 
  exposures 
  of 
  dark 
  quartzites 
  of 
  Potsdam 
  hori- 
  

   zon 
  at 
  several 
  points 
  in 
  the 
  next 
  depression 
  to 
  the 
  northwest, 
  

   about 
  the 
  edges 
  of 
  the 
  Amsterdam 
  reservoir. 
  Also 
  at 
  Union 
  

   Mills 
  with 
  Calciferous 
  just 
  west 
  and 
  again 
  in 
  the 
  depression 
  one 
  

   mile 
  south-southeast 
  of 
  Union 
  Mills, 
  and 
  in 
  the 
  creek 
  at 
  Fayville. 
  

   The 
  formation 
  appears 
  to 
  cover 
  a 
  considerable 
  area 
  in 
  the 
  west- 
  

   ern 
  part 
  of 
  Providence 
  township 
  and 
  the 
  southeastern 
  corner 
  of 
  

   Edinburgh 
  township, 
  but 
  the 
  slopes 
  to 
  the 
  crystalline 
  hills 
  are 
  

   heavily 
  drift 
  covered 
  and 
  outcrops 
  are 
  very 
  rare. 
  This 
  is 
  also 
  

   the 
  case 
  in 
  Northampton 
  township. 
  There 
  are 
  several 
  exposures 
  

   east 
  and 
  south 
  of 
  Northville. 
  They 
  are 
  of 
  hard, 
  slightly 
  cal- 
  

   careous, 
  gray-brown 
  sandstones 
  dipping 
  gently 
  southward 
  and 
  not 
  

   exposed 
  in 
  any 
  great 
  thickness. 
  At 
  one 
  point 
  on 
  the 
  upper 
  road 
  

   a 
  mile 
  and 
  a 
  half 
  southeast 
  of 
  North 
  ville 
  there 
  are 
  quartzitic 
  beds 
  

   seen 
  nearly 
  in 
  contact 
  with 
  gneiss 
  and 
  in 
  the 
  slope 
  half 
  a 
  mile 
  

   south 
  of 
  here 
  about 
  twenty 
  feet 
  of 
  hard-gray 
  and 
  brown 
  sand- 
  

   stones 
  are 
  exposed 
  near 
  the 
  roadside. 
  

  

  At 
  a 
  point 
  two 
  miles 
  due 
  west 
  from 
  Osborn's 
  bridge 
  there 
  is 
  a 
  

   quarry 
  in 
  Potsdam 
  sandstone 
  exposing 
  a 
  considerable 
  thickness 
  

   of 
  the 
  formations. 
  The 
  beds 
  are 
  light 
  buff 
  in 
  color, 
  of 
  moderate 
  

   thickness, 
  regularly 
  bedded 
  and 
  in 
  some 
  lasers 
  ripple 
  marked. 
  

   On 
  close 
  examination 
  the 
  stone 
  is 
  seen 
  to 
  be 
  speckled 
  with 
  dark- 
  

  

  