﻿REPORT 
  OE 
  THE 
  DIRECTOR 
  lOJ^ 
  2$ 
  

  

  from 
  500 
  to 
  600 
  feet, 
  and 
  they 
  extend 
  practically 
  throughout 
  the 
  

   whole 
  length 
  of 
  the 
  Dannemora 
  quadrangle. 
  It 
  is 
  evident 
  that 
  

   these 
  beaches 
  correlate 
  with 
  the 
  Cobblestone 
  hill 
  bars 
  and 
  other 
  

   detached 
  features 
  on 
  the 
  Mooers 
  quadrangle 
  that 
  formerly 
  were 
  

   puzzling. 
  

  

  Being 
  specially 
  developed 
  in 
  the 
  town 
  of 
  Peru 
  these 
  bars 
  in 
  

   the 
  " 
  Vermont 
  " 
  plane 
  will 
  be 
  called 
  in 
  this 
  report 
  the 
  Peru 
  

   beaches. 
  This 
  shore 
  exhibits 
  all 
  the 
  characters 
  which 
  argue 
  for 
  

   the 
  marine 
  origin 
  of 
  the 
  Covey 
  hill 
  beaches. 
  Taken 
  in 
  connec- 
  

   tion 
  with 
  the 
  features 
  on 
  the 
  adjacent 
  Mooers 
  quadrangle 
  they 
  

   afford 
  an 
  excellent 
  illustration 
  of 
  the 
  lack 
  of 
  value 
  of 
  negative 
  

   evidence 
  in 
  study 
  of 
  shore 
  lines, 
  and 
  the 
  error 
  in 
  judging 
  confi- 
  

   dently 
  from 
  a 
  single 
  district 
  or 
  a 
  limited 
  area. 
  

  

  The 
  Peru 
  (" 
  Vermont 
  ") 
  shore 
  phenomena 
  are 
  found 
  to 
  be 
  well 
  

   developed 
  southward 
  throughout 
  the 
  Champlain 
  valley, 
  on 
  both 
  

   sides 
  of 
  the 
  valley, 
  and 
  to 
  lie 
  far 
  above 
  the 
  Fort 
  Edward 
  divide. 
  

   They 
  have 
  been 
  mapped 
  on 
  the 
  Vermont 
  side 
  at 
  Burlington, 
  

   Middlebury 
  and 
  Brandon. 
  The 
  plane 
  declines 
  from 
  700 
  feet 
  on 
  

   the 
  international 
  boundary 
  to 
  660 
  feet 
  at 
  Cobblestone 
  hill, 
  520 
  feet 
  

   near 
  Ticonderoga, 
  440 
  feet 
  near 
  Glens 
  Falls, 
  and 
  390 
  feet 
  near 
  

   Mechanicville. 
  The 
  slope 
  of 
  the 
  plane 
  is 
  a 
  little 
  over 
  two 
  feet 
  

   a 
  mile. 
  These 
  beaches 
  are 
  not 
  the 
  highest 
  or 
  summit 
  bars 
  of 
  

   the 
  region 
  but 
  were 
  formed 
  after 
  some 
  uplifting 
  of 
  the 
  land 
  had 
  

   taken 
  place. 
  Their 
  strength 
  suggests 
  that 
  they 
  represent 
  a 
  rela- 
  

   tive 
  pause 
  or 
  a 
  slower 
  rate 
  in 
  the 
  land 
  uplifting. 
  

  

  The 
  highest 
  well-developed 
  bars 
  found 
  on 
  the 
  Dannemora 
  

   quadrangle 
  are 
  706 
  feet 
  in 
  height, 
  and 
  lie 
  west 
  of 
  Peru 
  vil- 
  

   lage. 
  Behind 
  the 
  highest 
  shore 
  features 
  throughout 
  the 
  quad- 
  

   rangle 
  lie 
  glacial 
  drainage 
  channels, 
  terminating 
  in 
  deltas. 
  These 
  

   channels 
  and 
  deltas 
  definitely 
  determine 
  the 
  height 
  of 
  the 
  stand- 
  

   ing 
  waters 
  during 
  the 
  recession 
  of 
  the 
  ice 
  front. 
  This 
  altitude 
  

   on 
  the 
  Dannemora 
  quadrangle 
  was 
  over 
  700 
  feet. 
  

  

  Northward 
  the 
  summit 
  plane 
  of 
  the 
  Champlain 
  waters 
  during 
  

   the 
  time 
  when 
  the 
  ice 
  sheet 
  was 
  waning 
  is 
  represented 
  by 
  

   beaches 
  at 
  Shea's 
  Lines, 
  on 
  the 
  Canadian 
  boundary, 
  south 
  of 
  

   Covey 
  Hill 
  post 
  office, 
  at 
  about 
  750 
  feet; 
  and 
  also 
  by 
  the 
  series 
  

   of 
  good 
  bars 
  at 
  Cannon 
  Corners, 
  with 
  an 
  altitude 
  of 
  750 
  feet. 
  

   Southward 
  the 
  summit 
  of 
  the 
  standing 
  water 
  is 
  shown 
  in 
  various 
  

   localities 
  and 
  specially 
  at 
  Port 
  Henry. 
  In 
  the 
  Hudson 
  valley 
  it 
  

   is 
  well 
  shown. 
  It 
  is 
  found 
  that 
  many 
  cities 
  and 
  villages 
  on 
  both 
  

   sides 
  of 
  the 
  valley 
  are 
  located 
  on 
  broad 
  summit 
  plains 
  of 
  deltas 
  

  

  