﻿GEOLOGY 
  OF 
  THE 
  NORTH 
  CREEK 
  QUADRANGLE 
  73 
  

  

  a 
  mile, 
  which 
  is 
  very 
  close 
  to 
  the 
  figure 
  given 
  by 
  Woodworth 
  for 
  

   the 
  lower 
  Champlain 
  valley. 
  

  

  Glacial 
  Lake 
  Johnsburg. 
  This 
  was 
  a 
  small 
  irregular 
  shaped 
  

   lake 
  extending 
  for 
  about 
  2^ 
  miles 
  southwestward 
  from 
  Johnsburg 
  

   as 
  proved 
  by 
  a 
  number 
  of 
  well-distributed 
  sand 
  flats 
  or 
  terraces 
  

   at, 
  or 
  a 
  little 
  above, 
  the 
  1300 
  foot 
  contour 
  line 
  which 
  approxi- 
  

   mately 
  marks 
  the 
  old 
  shore 
  line. 
  The 
  best 
  terraces, 
  practically 
  un- 
  

   represented 
  on 
  the 
  contour 
  map, 
  are 
  : 
  two-thirds 
  of 
  a 
  mile 
  west, 
  

   three-quarters 
  of 
  a 
  mile 
  southwest, 
  three-quarters 
  of 
  a 
  mile 
  south- 
  

   southwest, 
  and 
  at 
  several 
  places 
  about 
  2 
  miles 
  south-southwest 
  of 
  

   Johnsburg. 
  

  

  The 
  cause 
  of 
  this 
  static 
  water 
  condition 
  appears 
  to 
  have 
  been 
  

   either 
  an 
  ice 
  or 
  glacial 
  drift 
  dam 
  across 
  trfe 
  Mill 
  creek 
  channel 
  

   at 
  or 
  not 
  far 
  east 
  of 
  Johnsburg. 
  

  

  Glacial 
  Lake 
  North 
  Creek. 
  The 
  former 
  presence 
  of 
  a 
  lake 
  in 
  

   the 
  vicinity 
  of 
  North 
  Creek 
  is 
  proved 
  by 
  the 
  existence 
  of 
  thick 
  

   stratified 
  sands, 
  comprising 
  terraces 
  and 
  flats. 
  South 
  of 
  the 
  village 
  

   the 
  sands 
  show 
  a 
  depth 
  of 
  over 
  100 
  feet 
  where 
  they 
  have 
  been 
  

   trenched 
  by 
  the 
  small 
  creek. 
  Holcombville 
  lies 
  on 
  a 
  sand 
  flat 
  at 
  

   1 
  160 
  feet, 
  and 
  the 
  tongue 
  of 
  sand 
  just 
  southwest 
  of 
  North 
  Creek 
  

   rises 
  to 
  nearly 
  the 
  same 
  altitude. 
  Just 
  north 
  of 
  the 
  river 
  the 
  sands 
  

   were, 
  no 
  doubt, 
  largely 
  removed 
  by 
  postglacial 
  stream 
  work. 
  From 
  

   iy 
  2 
  to 
  2 
  miles 
  north-northeast 
  of 
  North 
  Creek 
  (along 
  the 
  new 
  

   State 
  road) 
  there 
  are 
  stratified 
  sands 
  and 
  gravels 
  running 
  up 
  as 
  

   high 
  as 
  1 
  140 
  or 
  possibly 
  1160 
  feet, 
  and 
  these 
  seem 
  to 
  correlate 
  with 
  

   the 
  deposits 
  south 
  of 
  the 
  village. 
  The 
  precise 
  location 
  of 
  the 
  re- 
  

   taining 
  dam 
  of 
  this 
  lake 
  can 
  not 
  be 
  given 
  but 
  it 
  was 
  either 
  ice 
  or 
  

   drift, 
  probably 
  the 
  latter, 
  across 
  the 
  Hudson 
  channel 
  not 
  over 
  2 
  

   miles 
  east 
  of 
  North 
  Creek. 
  

  

  One-half 
  of 
  a 
  mile 
  due 
  east 
  of 
  Holcombville 
  there 
  is 
  a 
  small 
  but 
  

   finely 
  developed 
  flat-topped 
  sand 
  terrace 
  at 
  an 
  altitude 
  of 
  1240 
  

   feet. 
  It 
  extends 
  out 
  as 
  a 
  distinct 
  apron 
  from 
  the 
  mountain 
  side 
  

   of 
  syenite. 
  The 
  depth 
  of 
  sand 
  in 
  this 
  terrace 
  is 
  fully 
  200 
  feet, 
  and 
  

   it 
  was 
  probably 
  formed 
  in 
  a 
  small, 
  marginal, 
  high 
  level 
  lake 
  when 
  

   the 
  ice 
  was 
  still 
  present. 
  

  

  The 
  Glen 
  glacial 
  lake. 
  This 
  body 
  of 
  water 
  extended 
  from 
  near 
  

   the 
  headwater 
  of 
  Millington 
  brook 
  northwestward 
  to 
  the 
  Hudson 
  

   river, 
  thence 
  along 
  the 
  river 
  channel 
  past 
  The 
  Glen, 
  and 
  to 
  near 
  

   the 
  mouth 
  of 
  Mill 
  creek. 
  Sand 
  flats 
  at 
  an 
  altitude 
  of 
  800 
  feet 
  or 
  

  

  