﻿rl52 
  NEW 
  YORK 
  STATE 
  M 
  USE 
  DM 
  

  

  This 
  theory 
  is 
  impossible, 
  for 
  a 
  great 
  part 
  of 
  the 
  lake 
  bottom 
  is 
  

   below 
  the 
  sea 
  level. 
  If 
  it 
  had 
  taken 
  place 
  to 
  anj 
  such 
  extent 
  at 
  a 
  

   time 
  when 
  the 
  land 
  was 
  elevated 
  the 
  valley 
  onght 
  to 
  be 
  wider, 
  and 
  

   the 
  shores 
  certainly 
  would 
  not 
  show 
  perpendicular 
  cliffs. 
  

  

  4 
  Secular 
  disintegration 
  and 
  removal 
  of 
  material. 
  

  

  The 
  homogeneity 
  of 
  the 
  region 
  is 
  too 
  complete 
  to 
  allow 
  of 
  such 
  an 
  

   action 
  to 
  such 
  an 
  extent. 
  

  

  5 
  Moulins. 
  

  

  This 
  formation 
  certainly 
  can 
  not 
  be 
  applied 
  to 
  this 
  lake. 
  

  

  I 
  can, 
  therefore, 
  see 
  no 
  other 
  explanation 
  possible 
  than 
  that 
  given 
  

   above 
  for 
  the 
  origin 
  of 
  this 
  lake. 
  

  

  A 
  change 
  of 
  the 
  continental 
  slope 
  might 
  possibly 
  lead 
  to 
  a 
  mis- 
  

   interpretation 
  of 
  the 
  old 
  stream 
  phenomena 
  — 
  but 
  it 
  could 
  in 
  no 
  way 
  

   affect 
  the 
  results 
  of 
  glaciation 
  so 
  far 
  as 
  they 
  have 
  been 
  used 
  as 
  an 
  

   argument 
  here. 
  

  

  The 
  formation 
  of 
  this 
  lake 
  is 
  certainly 
  an 
  argument 
  in 
  favor 
  of 
  

   the 
  theory 
  of 
  extensive 
  ice 
  erosion 
  in 
  solid 
  rock. 
  

  

  Appendix 
  

  

  Fig. 
  10 
  shows 
  the 
  last 
  fall 
  in 
  the 
  gorge 
  of 
  Fall 
  creek, 
  Ithaca, 
  at 
  

   the 
  mouth. 
  Comparing 
  it 
  with 
  Fig. 
  5 
  shows 
  the 
  difference 
  

   between 
  the 
  post 
  glacial 
  and 
  preglacial 
  valleys 
  in 
  the 
  local 
  rock. 
  

  

  Bibliography 
  

  

  1812 
  Yanuxem, 
  L. 
  Geol. 
  of 
  N. 
  Y. 
  3rd 
  district, 
  part 
  3, 
  p. 
  237. 
  

  

  1843 
  Hall, 
  J. 
  Ibid. 
  4th 
  district, 
  part 
  4, 
  p. 
  321, 
  405-6. 
  

  

  1862 
  Newberry, 
  J. 
  S. 
  Notes 
  on 
  the 
  surface 
  geology 
  of 
  the 
  basin 
  

   of 
  the 
  Great 
  Lakes. 
  Proc. 
  Bost. 
  soc. 
  nat. 
  hist. 
  Yol. 
  9: 
  

   42-46. 
  

  

  1874 
  Newberry, 
  J. 
  S. 
  On 
  the 
  structure 
  and 
  origin 
  of 
  the 
  Great 
  

   Lakes. 
  Proc. 
  N. 
  Y. 
  Lye. 
  nat. 
  hist. 
  Yol. 
  2:136-138. 
  

  

  1874 
  Newberry, 
  J. 
  S. 
  Geol. 
  sur. 
  of 
  Ohio. 
  Yol. 
  2 
  : 
  72-80. 
  

  

  1877 
  Simonds, 
  F. 
  W. 
  Geol. 
  of 
  Ithaca, 
  N. 
  Y., 
  and 
  the 
  vicinity. 
  

   Am. 
  naturalist. 
  Yol. 
  11 
  : 
  49-51. 
  

  

  1877 
  Foote, 
  C. 
  W. 
  Notes 
  upon 
  geol. 
  hist, 
  of 
  Cayuga 
  and 
  Seneca 
  

   lakes. 
  Thesis 
  at 
  C. 
  U. 
  for 
  degree 
  of 
  Ph. 
  D. 
  

  

  1880 
  Carll, 
  J. 
  F. 
  2nd 
  geol. 
  Sur. 
  of 
  Pa. 
  3 
  : 
  331. 
  

  

  