﻿GEOLOGY 
  OF 
  THE 
  NORTH 
  CREEK 
  QUADRANGLE 
  75 
  

  

  POSTGLACIAL 
  DRAINAGE 
  CHANGES 
  

  

  Aside 
  from 
  the 
  destruction 
  or 
  partial 
  destruction 
  of 
  glacial 
  

   lakes 
  by 
  cutting 
  down 
  the 
  outlets 
  or 
  rilling 
  them 
  up 
  or 
  both, 
  and 
  

   the 
  moderate 
  amount 
  of 
  downcutting 
  by 
  the 
  larger 
  streams 
  with 
  re- 
  

   sulting 
  development 
  of 
  terraces, 
  there 
  appear 
  to 
  have 
  been 
  no 
  im- 
  

   portant 
  drainage 
  changes. 
  Due 
  to 
  the 
  irregular 
  distribution 
  of 
  the 
  

   glacial 
  drift 
  many 
  of 
  the 
  small 
  streams 
  have 
  postglacial 
  courses, 
  

   but 
  the 
  larger 
  streams, 
  like 
  the 
  Hudson 
  and 
  Schroon 
  rivers, 
  are 
  

   believed 
  to 
  follow 
  practically 
  their 
  preglacial 
  channels 
  which 
  are 
  

   well 
  adjusted 
  to 
  the 
  character 
  and 
  structures 
  of 
  the 
  rock 
  masses 
  

   over 
  which 
  they 
  flow. 
  

  

  In 
  a 
  recent 
  paper 
  x 
  the 
  writer 
  discussed 
  certain 
  important 
  post- 
  

   glacial 
  drainage 
  changes 
  in 
  the 
  southeastern 
  Adirondacks, 
  and 
  since 
  

   one 
  of 
  the 
  changes 
  concerns 
  the 
  Hudson 
  river 
  immediately 
  after 
  it 
  

   leaves 
  the 
  North 
  Creek 
  sheet, 
  a 
  very 
  brief 
  statement 
  will 
  here 
  be 
  

   made. 
  

  

  Instead 
  of 
  the 
  present 
  long, 
  circuitous 
  course 
  of 
  the 
  Hudson 
  

   river 
  past 
  Stony 
  Creek, 
  Luzerne, 
  Corinth, 
  and 
  thence 
  across 
  the 
  

   Luzerne 
  mountain 
  to 
  Glens 
  Falls, 
  the 
  preglacial 
  Hudson 
  certainly 
  

   took 
  a 
  shorter 
  course, 
  most 
  likely 
  through 
  the 
  channel 
  from 
  War- 
  

   rensburg 
  to 
  Caldwell 
  and 
  thence 
  to 
  Glens 
  Falls. 
  

  

  The 
  great 
  gorge 
  of 
  the 
  Hudson 
  above 
  Stony 
  Creek 
  station 
  is 
  

   surely 
  of 
  either 
  interglacial 
  or 
  postglacial 
  origin 
  and 
  in 
  its 
  stead 
  

   a 
  preglacial 
  divide 
  was 
  located 
  there. 
  Evidences 
  favoring 
  this 
  view 
  

   are 
  given 
  in 
  the 
  paper 
  above 
  cited. 
  

  

  Since 
  the 
  preglacial 
  Hudson 
  river 
  did 
  not 
  flow 
  southward 
  across 
  

   the 
  Luzerne 
  sheet, 
  it 
  must 
  have 
  flowed 
  eastward 
  across 
  the 
  low 
  

   mountain 
  ridge 
  between 
  Warrensburg 
  and 
  the 
  Lake 
  George 
  de- 
  

   pression. 
  There 
  are 
  but 
  two 
  possible 
  channels 
  there, 
  namely 
  : 
  the 
  

   Warrensburg-Hillview 
  channel 
  and 
  the 
  Warrensburg-Caldwell 
  chan- 
  

   nel. 
  In 
  the 
  paper 
  above 
  cited, 
  arguments 
  are 
  presented 
  to 
  show 
  

   that 
  the 
  latter 
  channel 
  was 
  the 
  more 
  likely 
  one. 
  The 
  preglacial 
  

   Hudson 
  was 
  joined 
  by 
  the 
  Schroon 
  just 
  east 
  of 
  Warrensburg, 
  while 
  

   a 
  short 
  tributary, 
  having 
  its 
  source 
  on 
  the 
  Stony 
  Creek 
  divide, 
  flowed 
  

   northward 
  into 
  the 
  Hudson. 
  An 
  important 
  preglacial 
  stream, 
  called 
  

   the 
  Luzerne 
  river 
  by 
  the 
  writer, 
  had 
  its 
  source 
  on 
  the 
  Stony 
  Creek 
  

   divide 
  and 
  flowed 
  southward 
  past 
  Luzerne 
  and 
  Corinth 
  and 
  through 
  

   the 
  broad 
  valley 
  west 
  of 
  Saratoga 
  Springs. 
  

  

  1 
  Preglacial 
  Course 
  of 
  the 
  Upper 
  Hudson 
  River, 
  Geol. 
  Soc. 
  Amer. 
  Bui. 
  

   191 
  1, 
  2.2: 
  177-86. 
  

  

  