﻿30 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  accumulations 
  it 
  was 
  discovered 
  that 
  by 
  the 
  dumping 
  and 
  filling 
  

   process 
  already 
  described 
  a 
  great 
  till 
  barrier 
  had 
  been 
  formed 
  across 
  

   the 
  Schoharie 
  valley 
  just 
  south 
  of 
  the 
  small 
  village 
  of 
  Burtonsville. 
  

   That 
  till 
  barrier 
  raised 
  the 
  waters 
  of 
  the 
  Schoharie 
  above 
  that 
  point 
  

   to 
  a 
  hight 
  of 
  about 
  ioo 
  feet 
  greater 
  than 
  at 
  present. 
  The 
  till 
  has 
  

   been 
  cut 
  away 
  down 
  leaving 
  cliffs 
  largely 
  of 
  till 
  but 
  also 
  in 
  part, 
  on 
  

   the 
  concave 
  side 
  of 
  the 
  bend, 
  cliffs 
  of 
  bed 
  rock. 
  It 
  would 
  appear 
  

   that 
  this 
  raising 
  of 
  the 
  waters 
  must 
  have 
  extended 
  about 
  20 
  miles 
  

   up 
  the 
  Schoharie 
  from 
  Esperance 
  and 
  that 
  the 
  lake 
  was 
  maintained 
  

   there 
  in 
  the 
  immediate 
  postglacial 
  times 
  until 
  the 
  barrier 
  could 
  be 
  

   cut 
  away. 
  There 
  is 
  apparently 
  a 
  well 
  marked 
  delta 
  belonging 
  to 
  

   this 
  laku 
  above 
  Central 
  Bridge 
  and 
  along 
  the 
  valley 
  towards 
  Coble- 
  

   skill. 
  The 
  conditions 
  of 
  this 
  lake 
  above 
  Schoharie 
  village 
  need 
  

   further 
  study 
  for 
  their 
  full 
  elucidation. 
  

  

  Areas 
  of 
  marsh 
  and 
  obstructed 
  drainage. 
  It 
  was 
  not 
  practicable 
  

   to 
  distinguish 
  in 
  the 
  mapping 
  between 
  areas 
  of 
  existing 
  marsh 
  and 
  

   areas 
  of 
  soft 
  meadow 
  which 
  represent 
  recent 
  or 
  comparatively 
  

   recent 
  lake 
  filling. 
  These 
  areas, 
  however, 
  serve 
  in 
  an 
  interesting 
  

   way 
  to 
  show 
  the 
  obstruction 
  of 
  drainage 
  caused 
  by 
  glacial 
  deposits 
  

   and 
  a 
  moment's 
  inspection 
  of 
  the 
  map 
  would 
  show 
  that 
  where 
  the 
  

   deposits 
  are 
  conspicuously 
  massive, 
  as 
  along 
  the 
  belt 
  of 
  interlobate 
  

   moraine, 
  the 
  areas 
  of 
  marsh 
  and 
  lake 
  fillings 
  are 
  conspicuous. 
  

   It 
  is 
  quite 
  possible 
  that 
  many 
  small 
  areas 
  apparently 
  due 
  to 
  recent 
  

   lake 
  filling, 
  may 
  have 
  been 
  areas 
  also 
  occupied 
  by 
  small 
  lakes 
  of 
  

   glacial 
  age. 
  This, 
  however, 
  can 
  not 
  be 
  determined 
  unless 
  there 
  

   are 
  chances 
  for 
  suitable 
  excavation 
  or 
  exposure 
  of 
  the 
  materials. 
  

   Thus 
  along 
  Auries 
  creek 
  about 
  2 
  miles 
  southwest 
  of 
  Glen 
  is 
  a 
  flat 
  

   ground 
  about 
  a 
  mile 
  in 
  length 
  which 
  would 
  naturally 
  be 
  taken 
  as 
  

   a 
  combination 
  of 
  lake 
  filling 
  and 
  flood 
  plain 
  but 
  a 
  chance 
  section 
  

   made 
  by 
  the 
  stream 
  shows 
  massive 
  lacustrine 
  clays 
  containing 
  

   glaciated 
  stones 
  and 
  therefore 
  demonstrably 
  representing 
  a 
  lake 
  of 
  

   glacial 
  age. 
  

  

  Summary. 
  The 
  field 
  investigations 
  for 
  these 
  four 
  quadrangles, 
  

   Broadalbin, 
  Gloversville, 
  Amsterdam 
  and 
  Fonda, 
  are 
  practically 
  

   completed 
  and 
  seem 
  to 
  show 
  conclusively 
  the 
  presence 
  of 
  the 
  two 
  

   great 
  glacial 
  lobes 
  already 
  described 
  with 
  a 
  massive 
  interlobate 
  

   moraine 
  with 
  scant 
  evidences 
  of 
  any 
  recessional 
  moraine 
  in 
  the 
  case 
  

   of 
  the 
  Mohawk 
  glacier, 
  but 
  at 
  least 
  one 
  conspicuous 
  belt 
  of 
  reces- 
  

   sional 
  moraine 
  in 
  the 
  case 
  of 
  the 
  Sacandaga 
  glacier. 
  The 
  retreat 
  of 
  

   the 
  ice 
  is 
  marked 
  by 
  the 
  presence 
  of 
  glacial 
  waters, 
  notably 
  small 
  

   high 
  level 
  sand 
  plains 
  of 
  the 
  Sacandaga 
  delta, 
  the 
  high 
  level 
  lacus- 
  

  

  