﻿r92 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  less 
  steep 
  than 
  in 
  the 
  divides 
  of 
  the 
  other 
  valleys 
  belonging 
  to 
  the 
  

   Finger-lake 
  system. 
  A. 
  small 
  local 
  lake 
  was 
  held 
  up 
  to 
  the 
  eleva- 
  

   tion 
  of 
  the 
  Summit 
  col 
  and 
  its 
  waters 
  passed 
  southward 
  by 
  Owego 
  

   into 
  the 
  Susquehanna. 
  When- 
  the 
  ice 
  had 
  receded 
  as 
  far 
  north 
  as 
  

   Freeville, 
  a 
  lower 
  pass 
  was 
  uncovered 
  and 
  its 
  waters 
  conducted 
  

   through 
  the 
  Fall 
  creek 
  valley 
  into 
  glacial 
  lake 
  Ithaca 
  just 
  north 
  of 
  

   the 
  city 
  of 
  Ithaca. 
  The 
  outlet 
  by 
  way 
  of 
  Fall 
  creek 
  at 
  Freeville, 
  

   has 
  an 
  elevation 
  of 
  1046+ 
  feet, 
  and 
  was 
  held 
  for 
  only 
  a 
  short 
  time 
  ; 
  

   sufficiently 
  long, 
  however, 
  for 
  the 
  receding 
  ice 
  to 
  uncover 
  the 
  region 
  

   round 
  about 
  Locke 
  and 
  North 
  Lansing, 
  when 
  the 
  drainage 
  was 
  

   again 
  shifted 
  to 
  the 
  north 
  but 
  more 
  pernianently 
  fixed. 
  

  

  Professor 
  G. 
  K. 
  Gilbert 
  informs 
  the 
  writer 
  that 
  he 
  has 
  found 
  a 
  

   distinct 
  and 
  well 
  defined 
  scour-way^ 
  in 
  the 
  neighborhood 
  of 
  North 
  

   Lansing 
  leading 
  into 
  a 
  stream 
  tributary 
  to 
  Salmon 
  creek, 
  which 
  enters 
  

   Cayuga 
  lake 
  a 
  little 
  to 
  the 
  south 
  and 
  west 
  of 
  the 
  town 
  of 
  Ludlow- 
  

   ville, 
  through 
  which 
  the 
  waters 
  of 
  glacial 
  lake 
  Groton 
  must 
  have 
  

   found 
  escape. 
  

  

  Professor 
  Gilbert 
  further 
  states 
  that, 
  while 
  the 
  evidence 
  for 
  the 
  

   existence 
  of 
  this 
  cannot 
  be 
  mistaken, 
  its 
  dimensions 
  would 
  rather 
  

   indicate 
  an 
  escape 
  of 
  a 
  not 
  very 
  large 
  volume 
  of 
  water, 
  and 
  that 
  it 
  

   was 
  probably 
  not 
  occupied 
  for 
  any 
  very 
  considerable 
  length 
  of 
  

   time, 
  although 
  much 
  more 
  strongly 
  defined 
  than 
  the 
  Freeville 
  

   outlet. 
  Its 
  elevation 
  as 
  given 
  by 
  Gilbert 
  is 
  between 
  960 
  and 
  980 
  

   feet, 
  nearer 
  the 
  former, 
  however. 
  (Figure 
  20) 
  

  

  The 
  North 
  Lansing 
  overflow 
  is 
  the 
  most 
  northerly 
  one 
  through 
  

   which 
  the 
  waters 
  of 
  the 
  Groton 
  stage 
  found 
  independent 
  drainage 
  

   into 
  lake 
  Ithaca. 
  It 
  was 
  held 
  until 
  the 
  ice 
  had 
  retreated 
  sufficiently 
  

   far 
  northward 
  to 
  uncover 
  the 
  lowerlands 
  to 
  the 
  west, 
  when 
  the 
  

   Groton 
  stage 
  was 
  closed 
  by 
  a 
  falling 
  of 
  its 
  waters 
  to 
  the 
  Newberry 
  

   level. 
  

  

  Thus 
  the 
  lake 
  at 
  Dryden 
  summit 
  found 
  independent 
  drain- 
  

   age 
  to 
  the 
  south, 
  while 
  the 
  expanded 
  waters 
  afterwards 
  discharged 
  

   at 
  different 
  times 
  through 
  two 
  outlets, 
  more 
  northerly 
  located 
  

   the 
  one 
  at 
  Freeville, 
  and 
  the 
  other 
  at 
  North 
  Lansing, 
  into 
  glacial 
  

   lake 
  Ithaca. 
  

  

  a 
  I 
  am 
  indebted 
  to 
  Prof. 
  Gilbert 
  for 
  a 
  knowledge 
  of 
  the 
  existence 
  and 
  description 
  of 
  the 
  

   North 
  Lansing 
  overflow. 
  

  

  