﻿74 
  NE 
  W 
  YORK 
  STATE 
  MUSEUM 
  

  

  a 
  little 
  over, 
  are 
  well 
  shown 
  from 
  i 
  to 
  i^ 
  miles 
  east 
  of 
  the 
  mouth 
  

   of 
  Milling-ton 
  brook, 
  and 
  a 
  perfect 
  sand 
  terrace, 
  fully 
  200 
  yards 
  

   wide, 
  three-quarters 
  of 
  a 
  mile 
  long, 
  and 
  at 
  an 
  altitude 
  of 
  about 
  

   C800 
  feet, 
  lies 
  against 
  a 
  granite 
  ridge 
  two-thirds 
  of 
  a 
  mile 
  north- 
  

   cast 
  of 
  the 
  mouth 
  of 
  the 
  brook. 
  One-half 
  of 
  a 
  mile 
  above 
  the 
  

   mouth 
  of 
  Potter 
  brook, 
  and 
  also 
  nearly 
  2 
  miles 
  above 
  its 
  mouth, 
  

   are 
  perfect, 
  small 
  sand 
  terraces 
  at 
  from 
  800 
  to 
  820 
  feet. 
  At 
  The 
  

   Crien 
  the 
  railroad 
  passes 
  along 
  the 
  base 
  of 
  a 
  fine 
  flat-topped 
  terrace 
  

   which 
  rises 
  over 
  60 
  feet 
  above 
  the 
  track. 
  It 
  is 
  not 
  shown 
  on 
  the 
  

   map 
  but 
  by 
  lock 
  level 
  its 
  altitude 
  was 
  found 
  to 
  be 
  a 
  little 
  over 
  

   Soo 
  feet. 
  From 
  1 
  to 
  2 
  miles 
  north 
  of 
  The 
  Glen 
  and 
  on 
  the 
  east 
  

   side 
  of 
  the 
  river 
  there 
  is 
  an 
  extensive 
  sand 
  and 
  gravel 
  flat 
  whose 
  

   altitude 
  is 
  about 
  820 
  feet. 
  

  

  It 
  is 
  interesting 
  to 
  note 
  that 
  the 
  coarsest 
  deposits 
  are 
  toward 
  

   the 
  north 
  because 
  there 
  the 
  Hudson 
  river 
  with 
  its 
  load 
  of 
  debris 
  

   entered 
  the 
  lake. 
  The 
  deposits 
  of 
  this 
  extinct 
  lake 
  also 
  rise 
  gradu- 
  

   ally 
  toward 
  the 
  north 
  because 
  of 
  the 
  postglacial 
  land 
  tilting. 
  Near 
  

   The 
  Glen 
  the 
  lake 
  was 
  very 
  narrow. 
  The 
  water 
  of 
  this 
  lake 
  ap- 
  

   pears 
  to 
  have 
  been 
  ponded 
  by 
  a 
  drift 
  dam 
  across 
  the 
  Hudson 
  river 
  

   just 
  below 
  the 
  mouth 
  of 
  Millington 
  brook. 
  

  

  Other 
  extinct 
  lakes. 
  Many 
  other 
  smaller 
  glacial 
  lakes, 
  now 
  

   cither 
  wholly 
  or 
  partly 
  extinct, 
  occur 
  within 
  the 
  map 
  limits. 
  Thus 
  

   Tripp 
  pond 
  was 
  formerly 
  much 
  larger 
  as 
  shown 
  by 
  a 
  number 
  of 
  

   line 
  flat-topped 
  sand 
  terraces 
  lying 
  at 
  from 
  1020 
  to 
  1040 
  feet. 
  The 
  

   former 
  lake 
  was 
  over 
  2 
  miles 
  long 
  with 
  a 
  drift 
  dam 
  a 
  little 
  over 
  

   a 
  mile 
  north 
  of 
  the 
  present 
  lake. 
  

  

  The 
  little 
  valley 
  shown 
  on 
  the 
  map 
  2 
  miles 
  southeast 
  of 
  Chester- 
  

   town 
  is 
  certainly 
  an 
  old 
  lake 
  bottom. 
  Most 
  of 
  the 
  swamp 
  areas 
  

   are 
  also 
  old 
  lake 
  or 
  pond 
  bottoms. 
  

  

  Existing 
  lakes. 
  None 
  of 
  the 
  lakes 
  of 
  the 
  quadrangle 
  are 
  of 
  

   preglacial 
  origin. 
  Some 
  of 
  them, 
  such 
  as 
  Schroon 
  lake, 
  Valentine 
  

   pond, 
  Tripp 
  pond, 
  Smith 
  pond, 
  and 
  probably 
  Loon 
  lake, 
  are 
  merely 
  

   shrunken 
  remnants 
  of 
  former 
  larger 
  bodies 
  of 
  water 
  as 
  already 
  

   described. 
  The 
  waters 
  of 
  all 
  the 
  lakes 
  and 
  ponds 
  are 
  held 
  in 
  either 
  

   by 
  glacial 
  drift 
  or 
  old 
  lake 
  deposit 
  dams 
  and 
  most 
  of 
  them 
  show 
  

   evidence 
  of 
  having 
  been 
  at 
  more 
  or 
  less 
  higher 
  levels. 
  Some 
  of 
  the 
  

   ponds 
  seem 
  to 
  occupy 
  depressions 
  in 
  the 
  irregularly 
  deposited 
  

   drift. 
  Ice 
  erosion 
  may 
  have 
  been 
  effective 
  in 
  deepening 
  some 
  of 
  the 
  

   basins 
  as, 
  for 
  example, 
  that 
  of 
  Friends 
  lake, 
  though 
  positive 
  proof 
  

   is 
  wholly 
  lacking. 
  

  

  