﻿REPORT 
  OF 
  THE 
  DIRECTOR 
  I'SS 
  

  

  correlation 
  throughout 
  ; 
  also, 
  each 
  correlative 
  set 
  has 
  its 
  corre- 
  

   sponding 
  outlet 
  with 
  which 
  it 
  can 
  be 
  correlated, 
  and 
  the 
  ter- 
  

   races 
  are 
  not 
  in 
  any 
  degree 
  irregular 
  deposits 
  but 
  true 
  and 
  fairly 
  

   typical 
  deltas. 
  

  

  It 
  is 
  very 
  evident 
  that 
  the 
  facts 
  are 
  not 
  in 
  any 
  degree 
  consistent 
  with 
  ' 
  

   the 
  marginal 
  lake 
  liypothesis, 
  as 
  it 
  fails 
  in 
  its 
  explanation 
  thereof, 
  

   and 
  is 
  eliminated 
  on 
  the 
  same 
  ground 
  as 
  the 
  first, 
  namely, 
  in 
  being 
  

   inadequate 
  as 
  a 
  solution. 
  

  

  General 
  lake 
  hypothesis 
  

  

  The 
  third 
  and 
  last 
  hypothesis 
  is 
  that 
  of 
  a 
  general 
  lake 
  condition 
  

   caused 
  by 
  a 
  damming 
  of 
  the 
  north 
  flowing 
  streams 
  by 
  the 
  receding 
  ice 
  

   front 
  serving 
  as 
  a 
  barrier 
  to 
  the 
  north. 
  Tlie 
  topographic 
  condition 
  of 
  

   the 
  glacier 
  front, 
  if 
  such 
  a 
  term 
  can 
  be 
  applied, 
  would 
  have 
  no 
  special 
  

   effect 
  upon 
  the 
  results; 
  whether 
  the 
  retreating 
  front 
  was 
  a 
  perpen- 
  

   dicular 
  or 
  nearly 
  precipitous 
  wall, 
  or, 
  whether 
  it 
  w^as 
  of 
  a 
  more 
  or 
  

   less 
  gentle 
  slope, 
  the 
  I'esult 
  would 
  be 
  the 
  same, 
  so 
  long 
  as 
  the 
  ice 
  was 
  

   of 
  sufficient 
  height 
  and 
  continuous 
  across 
  the 
  valley. 
  

  

  The 
  discussion 
  of 
  the 
  terraces 
  in 
  the 
  hypotheses 
  here 
  outlined, 
  is 
  

   restricted 
  to 
  the 
  higher 
  ones, 
  as 
  the 
  lower 
  terraces 
  have 
  not 
  been 
  

   thoroughly 
  studied, 
  and 
  the 
  conditions 
  may 
  or 
  may 
  not 
  hold 
  true 
  

   with 
  equal 
  certainty. 
  

  

  Evidence 
  of 
  ice 
  withdrawal 
  as 
  manifested 
  in 
  the 
  moraines 
  

  

  Chamberlin"* 
  has 
  traced 
  and 
  described 
  the 
  moraine 
  filling 
  the 
  

   southern 
  extremities 
  of 
  the 
  Finger-lake 
  valleys 
  which 
  he 
  has 
  corre- 
  

   lated 
  with 
  the 
  " 
  Terminal 
  moraine 
  of 
  the 
  second 
  glacial 
  epoch." 
  

   (Figure 
  17) 
  The 
  general 
  outline 
  of 
  this 
  deposit 
  is 
  convex 
  south- 
  

   ward, 
  with 
  its 
  maximum 
  convexity 
  immediately 
  south 
  of 
  the 
  

   heads 
  of 
  Lakes 
  Cayuga 
  and 
  Seneca. 
  It 
  is 
  vastly 
  stronger 
  in 
  develop- 
  

   ment 
  than 
  any 
  of 
  the 
  more 
  northerly 
  ones. 
  The 
  eastern 
  part 
  of 
  

   this 
  moraine 
  is 
  distinctly 
  traceable 
  in 
  a 
  northeasterly 
  direction 
  cross- 
  

   ing 
  the 
  valley 
  of 
  Six 
  Mile 
  creek 
  near 
  its 
  entrance 
  into 
  the 
  Inlet 
  valley 
  

   where 
  the 
  filling 
  is 
  markedly 
  heavy; 
  thence, 
  by 
  the 
  East 
  Ithaca 
  

   depot, 
  into 
  the 
  valley 
  of 
  Fall 
  creek, 
  which 
  it 
  follows 
  to 
  and 
  beyond 
  

   Freeville, 
  and 
  is 
  almost 
  continuously 
  traceable 
  as 
  far 
  as 
  Cortland, 
  

   some 
  20 
  miles 
  northeast 
  from 
  Ithaca. 
  Its 
  western 
  part 
  is 
  somewhat 
  

  

  a 
  Third 
  ann'l 
  report, 
  U. 
  S. 
  G. 
  S., 
  ]881-'82, 
  353-360. 
  

  

  