﻿REPORT 
  OF 
  THE 
  DIRECTOR 
  rl51 
  

  

  It 
  shows 
  the 
  predominant 
  north 
  and 
  south 
  markings, 
  and 
  three 
  

   other 
  series 
  pointing 
  at 
  various 
  angles 
  down 
  the 
  valley 
  slope. 
  

  

  Along 
  the 
  road 
  on 
  the 
  east 
  side 
  is 
  a 
  vertical 
  face 
  of 
  rock 
  showing 
  

   the 
  striae 
  at 
  several 
  angles 
  of 
  depression, 
  this 
  evidence 
  being 
  much 
  

   more 
  convincing. 
  

  

  The 
  very 
  form 
  of 
  the 
  lake 
  is 
  a 
  strong 
  evidence 
  of 
  the 
  force 
  that 
  

   made 
  it. 
  Along 
  the 
  lower 
  half, 
  which 
  is 
  north 
  and 
  south, 
  the 
  width 
  

   averages 
  a 
  mile 
  greater 
  than 
  that 
  of 
  the 
  upper 
  end, 
  which 
  bears 
  

   northwest, 
  and 
  narrows 
  just 
  at 
  the 
  point 
  where 
  it 
  changes 
  its 
  

   direction. 
  

  

  This 
  is 
  just 
  what 
  we 
  notice 
  in 
  the 
  tributary 
  preglacial 
  valleys 
  — 
  

   that 
  those 
  ruuning 
  north 
  and 
  south 
  are 
  much 
  wider 
  than 
  those 
  extend- 
  

   ing 
  in 
  other 
  directions 
  — 
  and 
  this 
  feature 
  is 
  unhesitatingly 
  ascribed 
  to 
  

   glacial 
  action. 
  Certainly 
  then 
  the 
  same 
  force 
  could 
  perform 
  a 
  

   greater 
  work 
  in 
  a 
  greater 
  valley. 
  

  

  That 
  a 
  drift 
  dam 
  is 
  an 
  important 
  feature 
  in 
  Cayuga 
  lake 
  is 
  cer- 
  

   tain. 
  The 
  gradual 
  shallowing 
  at 
  the 
  lower 
  end, 
  the 
  drift 
  covered 
  

   shores, 
  and 
  the 
  topography 
  of 
  the 
  surrounding 
  country, 
  all 
  bear 
  

   witness 
  to 
  this. 
  

  

  We 
  have 
  at 
  present, 
  no 
  exact 
  knowledge 
  of 
  the 
  depth 
  of 
  the 
  drift 
  

   dam. 
  At 
  Seneca 
  lake, 
  it 
  is 
  from 
  150 
  to 
  250 
  feet 
  or 
  more, 
  and 
  

   very 
  likely 
  this 
  is 
  equally 
  true 
  at 
  Cayuga. 
  

  

  The 
  origin 
  of 
  Cayuga 
  lake, 
  as 
  I 
  have 
  translated 
  the 
  evidence, 
  

   is, 
  that 
  an 
  extremely 
  old 
  preglacial 
  valley 
  has 
  been 
  cut 
  much 
  

   deeper 
  and 
  wider 
  and 
  converted 
  into 
  a 
  rock 
  basin 
  by 
  the 
  erosive 
  

   power 
  of 
  ice 
  during 
  the 
  glacial 
  epoch, 
  and 
  the 
  depth 
  of 
  the 
  basin 
  

   thus 
  formed 
  has 
  been 
  increased 
  by 
  a 
  drift 
  dam. 
  

  

  The 
  other 
  theories 
  to 
  account 
  for 
  such 
  a 
  basin 
  as 
  this 
  are 
  : 
  

  

  1 
  Solution 
  of 
  material 
  and 
  settling 
  of 
  the 
  bottom. 
  

  

  Whatever 
  may 
  be 
  the 
  value 
  of 
  this 
  theory 
  in 
  other 
  regions, 
  it 
  

   can 
  not 
  be 
  applied 
  here, 
  as 
  there 
  is 
  no 
  soluble 
  rock 
  in 
  this 
  region 
  

   except 
  a 
  little 
  in 
  the 
  Onondaga 
  salt 
  group, 
  and 
  that 
  is 
  north 
  of 
  the 
  

   lake. 
  AV^ere 
  this 
  true, 
  the 
  strata 
  somewhere 
  along 
  the 
  sides 
  must 
  

   show 
  the 
  bending 
  — 
  but 
  they 
  do 
  not. 
  

  

  2 
  Faulting. 
  

  

  This 
  is 
  out 
  of 
  the 
  question, 
  as 
  not 
  the 
  slightest 
  trace 
  of 
  it 
  can 
  be 
  

   found 
  anywhere 
  in 
  this 
  region. 
  

  

  3 
  Water 
  erosion. 
  

  

  