﻿io6 
  

  

  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  few 
  miles 
  south 
  of 
  Boonville, 
  along 
  this 
  stream, 
  was 
  mostly 
  cut 
  by 
  

   the 
  fairly 
  large 
  stream 
  which 
  drained 
  the 
  glacial 
  lake 
  at 
  this 
  stage. 
  

   The 
  southward 
  discharge 
  through 
  this 
  channel 
  appears 
  to 
  have 
  

   been 
  into 
  the 
  Lansing 
  Kill 
  lake 
  where 
  a 
  delta 
  deposit 
  was 
  formed 
  

   a 
  few 
  miles 
  north 
  of 
  Rome 
  and 
  now 
  the 
  site 
  of 
  the 
  Delta 
  reservoir. 
  

   Lansing 
  Kill 
  lake 
  in 
  turn 
  drained 
  through 
  the 
  Mohawk 
  Valley. 
  

   Still 
  further 
  retreat 
  of 
  the 
  ice 
  lobe 
  allowed 
  Black 
  lake 
  to 
  ex- 
  

   pand 
  greatly 
  until 
  it 
  reached 
  from 
  the 
  region 
  around 
  Forestport 
  

   to 
  north 
  of 
  Lowville, 
  when 
  it 
  had 
  a 
  width 
  of 
  from 
  five 
  to 
  ten 
  miles. 
  

   When 
  the 
  ice 
  withdrew 
  enough 
  to 
  permit 
  a 
  discharge 
  of 
  water 
  

   around 
  the 
  north 
  base 
  of 
  Tug 
  hill, 
  and 
  into 
  Lake 
  Iroquois, 
  the 
  level 
  

   of 
  the 
  lake 
  rapidly 
  fell 
  until 
  the 
  ice 
  barrier 
  was 
  completely 
  removed. 
  

   The 
  former 
  presence 
  of 
  this 
  great 
  glacial 
  lake 
  is 
  conclusively 
  shown 
  

   by 
  the 
  extensive 
  development 
  of 
  unquestioned 
  delta 
  deposits. 
  

   Where 
  the 
  streams 
  from 
  the 
  Adirondacks, 
  especially 
  the 
  larger 
  

   ones 
  such 
  as 
  Black, 
  Moose, 
  and 
  Independent 
  rivers, 
  emptied 
  into 
  

   the 
  lake, 
  delta 
  deposits 
  were 
  rapidly 
  built 
  up 
  to 
  near 
  the 
  lake 
  sur- 
  

   face 
  because 
  those 
  streams 
  were 
  heavily 
  charged 
  with 
  debris 
  from 
  

   the 
  newly 
  drift-strewn 
  mountains. 
  These 
  delta 
  deposits 
  became 
  

   more 
  or 
  less 
  merged, 
  and 
  they 
  show 
  a 
  remarkable 
  concordance 
  of 
  

   altitudes 
  over 
  the 
  sand 
  flat 
  or 
  sand 
  plain 
  country 
  on 
  the 
  east 
  side 
  of 
  

   Black 
  river. 
  This 
  great 
  delta 
  deposit 
  is 
  several 
  miles 
  wide; 
  very 
  

   flat-topped 
  except 
  where 
  trenched 
  by 
  postglacial 
  streams; 
  presents 
  

   a 
  steep 
  front 
  toward 
  the 
  river 
  ; 
  and 
  shows 
  a 
  depth 
  of 
  from 
  200 
  to 
  

   250 
  feet 
  along 
  the 
  western 
  edge. 
  Figure 
  35 
  clearly 
  shows 
  the 
  rela- 
  

   tion 
  of 
  the 
  delta 
  deposit 
  to 
  the 
  old 
  rocks 
  of 
  the 
  valley. 
  

  

  Egggfl 
  Glacial 
  Jake 
  delta 
  deposit 
  

   |y.y.;;j 
  Osweoo 
  •sandstone 
  

  

  I 
  I 
  Lorraine 
  sno/e 
  <f 
  sandstone 
  

  

  rz--z:J 
  Utica 
  sha/e 
  

  

  Trenton 
  l/mesione 
  

   Fb/net/a-Lowv/'t/e 
  //'mestone 
  

  

  l-^~-| 
  Pa/eojo/c 
  strata 
  fconcea/edj 
  

  

  I 
  /^U\ 
  1 
  Precambr/c 
  rbcAs 
  

  

  Fig. 
  35 
  East-west 
  section 
  across 
  the 
  Black 
  river 
  valley, 
  2^4 
  miles 
  north 
  

   of 
  Lyons 
  Falls, 
  showing 
  the 
  terraced 
  character 
  of 
  the 
  Paleozoic 
  strata 
  and 
  

   their 
  relations 
  to 
  the 
  Precambric 
  Adirondack 
  rocks. 
  On 
  the 
  east 
  side, 
  the 
  

   position 
  of 
  the 
  glacial 
  lake 
  delta 
  deposit 
  is 
  shown. 
  Length 
  of 
  section 
  12^ 
  

   miles. 
  Vertical 
  scale 
  greatly 
  exaggerated. 
  

  

  After 
  W. 
  J. 
  Miller, 
  N. 
  Y. 
  State 
  Mus. 
  Bui. 
  135 
  

  

  