﻿KEPOKT 
  OF 
  THE 
  DIRECTOR 
  rl37 
  

  

  iied 
  deposit 
  of 
  gravel 
  and 
  sand. 
  Along 
  some 
  exposures 
  the 
  strata 
  

   exhibit 
  the 
  lenticular 
  arrangement 
  common 
  to 
  any 
  stream 
  bed 
  — 
  

   coarse 
  pebble 
  beds 
  grading 
  into 
  liner 
  — 
  and 
  these 
  in 
  tain 
  ending 
  

   in 
  a 
  sand 
  deposit, 
  but 
  near 
  the 
  mouth 
  there 
  is 
  a 
  solid 
  layer 
  of 
  loam 
  

   with 
  a 
  few 
  pebbles 
  in 
  it. 
  

  

  The 
  ravine 
  maintains 
  this 
  same 
  appearance 
  of 
  a 
  broad 
  valley 
  with 
  

   a 
  stratified 
  bed, 
  for 
  something 
  over 
  a 
  mile, 
  when 
  it 
  is 
  suddenly 
  ter- 
  

   minated 
  by 
  a 
  horseshoe 
  shaped 
  ledge 
  about 
  300 
  feet 
  wide, 
  over 
  one 
  

   corner 
  of 
  which 
  the 
  stream 
  falls. 
  Prof. 
  Freley, 
  of 
  Wells 
  college, 
  

   stated 
  that 
  the 
  bottom 
  of 
  this 
  fall 
  is 
  about 
  45 
  feet 
  above 
  the 
  lake 
  

   level. 
  

  

  The 
  south 
  wall 
  is 
  country 
  rock 
  all 
  the 
  way 
  to 
  the 
  fall, 
  and 
  on 
  

   top 
  of 
  "it 
  can 
  be 
  found 
  the 
  series 
  of 
  terraces, 
  though 
  they 
  are 
  not 
  

   well 
  marked, 
  as 
  the 
  slope 
  is 
  more 
  gentle 
  here 
  than 
  along 
  the 
  streams 
  

   to 
  the 
  south. 
  

  

  On 
  the 
  north 
  side 
  the 
  numerous 
  runlets 
  enter 
  the 
  gorge 
  more 
  

   gradually 
  than 
  on 
  the 
  south 
  side, 
  and 
  show 
  the 
  rock 
  to 
  be 
  at 
  some 
  

   distance 
  from 
  the 
  bank 
  of 
  the 
  gorge 
  and 
  the 
  intervening 
  space 
  to 
  be 
  

   filled 
  with 
  drift. 
  

  

  Passing 
  over 
  the 
  rock 
  hill 
  which 
  forms 
  the 
  shore 
  cliff, 
  a 
  mile 
  

   north 
  of 
  Aurora, 
  the 
  country 
  rock 
  has 
  been 
  worn 
  away 
  to 
  a 
  much 
  

   greater 
  extent 
  and 
  the 
  drift 
  is 
  somewhat 
  deeper, 
  giving 
  a 
  more 
  

   rolling 
  aspect 
  to 
  the 
  topography. 
  The 
  Helderberg 
  limestone 
  is 
  the 
  

   country 
  rock 
  here 
  and 
  several 
  quarries 
  in 
  it 
  show 
  excellent 
  sections 
  

   through 
  the 
  drift 
  and 
  striations 
  on 
  the 
  top 
  of 
  the 
  rock 
  bearing 
  

   North 
  8° 
  West 
  as 
  may 
  be 
  observed 
  in 
  the 
  quarries 
  in 
  Taughannock 
  

   ravine 
  on 
  top 
  of 
  the 
  Tully 
  limestone 
  just 
  across 
  the 
  lake, 
  and 
  in 
  

   many 
  places 
  about 
  Ithaca. 
  

  

  At 
  Union 
  Springs, 
  the 
  rock 
  hill 
  which 
  forms 
  the 
  lake 
  boundary 
  

   thus 
  far, 
  begins 
  to 
  recede, 
  and 
  from 
  here 
  to 
  the 
  outlet 
  of 
  the 
  lake, 
  

   the 
  shore 
  is 
  much 
  flatter. 
  Marshes 
  and 
  inlets 
  abound 
  along 
  the 
  

   shore 
  — 
  a 
  feature 
  entirely 
  absent 
  above 
  except 
  on 
  the 
  deltas 
  at 
  the 
  

   mouths 
  of 
  streams. 
  For 
  the 
  remainder 
  of 
  the 
  distance 
  the 
  shore 
  is 
  

   composed 
  entirely 
  of 
  loose 
  material 
  — 
  glacial 
  drift 
  which 
  slopes 
  

   gradually 
  up 
  from 
  the 
  water 
  to 
  a 
  height 
  not 
  exceeding 
  200 
  feet 
  and 
  

   averaging 
  much 
  less. 
  

  

  The 
  lake 
  is 
  much 
  shallower 
  from 
  here 
  to 
  its 
  outlet, 
  running 
  from 
  

   30 
  feet 
  at 
  Union 
  springs 
  to 
  10 
  or 
  12 
  feet 
  at 
  the 
  end. 
  

  

  