﻿GEOLOGY 
  OF 
  THOUSAND 
  ISLANDS 
  REGION 
  155 
  

  

  Northward 
  toward 
  Theresa 
  are 
  several 
  extensive 
  sand 
  tracts 
  

   which 
  are 
  not 
  covered 
  by 
  our 
  maps. 
  East 
  of 
  Strough 
  is 
  a 
  level 
  

   sand 
  area 
  of 
  2 
  or 
  3 
  square 
  miles, 
  traversed 
  by 
  the 
  Clayton 
  branch 
  

   of 
  the 
  New 
  York 
  Central 
  Railroad, 
  which 
  seems 
  to 
  have 
  been 
  mostly 
  

   leveled 
  by 
  Gilbert 
  waters, 
  but 
  which 
  retains 
  some 
  kame 
  topography 
  

   along 
  the 
  railroad. 
  Another 
  tract 
  is 
  at 
  Theresa 
  Junction 
  and 
  

   eastward 
  on 
  both 
  sides 
  of 
  Indian 
  river, 
  and 
  up 
  the 
  river 
  on 
  the 
  

   west 
  side. 
  Other 
  areas 
  occur 
  : 
  one 
  2 
  miles 
  south 
  of 
  Strough, 
  and 
  

   one 
  a 
  mile 
  south 
  of 
  Theresa. 
  Other 
  tracts, 
  or 
  extension 
  of 
  those 
  

   noted 
  above, 
  may 
  occur 
  out 
  of 
  sight 
  from 
  the 
  roads. 
  

  

  On 
  plate 
  46 
  a 
  series 
  of 
  sand 
  areas 
  are 
  shown 
  extending 
  from 
  

   St 
  Lawrence 
  northeast 
  toward 
  Clayton, 
  which 
  are 
  related 
  to 
  the 
  

   Prospect 
  Park 
  boulder 
  kames. 
  Other 
  small 
  sand 
  tracts 
  are 
  marked 
  

   on 
  this 
  map. 
  and 
  also 
  on 
  plate 
  47. 
  

  

  Some 
  of 
  these 
  sand 
  areas 
  have 
  not 
  only 
  been 
  modified 
  by 
  the 
  sub- 
  

   ir-erging 
  waters 
  but 
  have 
  been 
  w^orked 
  on 
  by 
  the 
  winds. 
  The 
  dune 
  

   characters 
  in 
  some 
  cases 
  rather 
  obscures 
  the. 
  glacial 
  origin. 
  Some 
  

   tracts 
  are 
  fine, 
  clean 
  sand, 
  with 
  basins 
  or 
  swampy 
  intervals, 
  like 
  

   the 
  Theresa 
  Junction 
  area. 
  It 
  would 
  appear 
  that 
  these 
  sands 
  were 
  

   laid 
  in 
  glacial 
  waters 
  over 
  or 
  among 
  stagnant 
  ice 
  blocks 
  ; 
  subse- 
  

   quently 
  modified 
  by 
  the 
  lowering 
  waters 
  ; 
  and 
  lastly 
  acted 
  on 
  by 
  

   the 
  winds. 
  

  

  Eskers. 
  Plates 
  46 
  and 
  47 
  exhibit 
  several 
  series 
  of 
  kame 
  knolls 
  

   lying 
  in 
  definite 
  chains 
  in 
  the 
  same 
  direction 
  as 
  the 
  ice 
  movement, 
  

   some 
  of 
  them 
  blending 
  into 
  true 
  eskers. 
  One 
  stands 
  on 
  the 
  flood 
  

   plain 
  of 
  Indian 
  river 
  ; 
  another 
  close 
  to 
  the 
  St 
  Lawrence 
  river, 
  4 
  

   miles 
  southwest 
  of 
  Alexandria 
  Bay 
  ; 
  and 
  two 
  parallel 
  chains 
  3 
  miles 
  

   northwest 
  of 
  Lafargeville. 
  The 
  mapping 
  somewhat 
  overempha- 
  

   sizes 
  the 
  directness 
  and 
  regularity 
  of 
  these 
  esker-kames. 
  The 
  

   line 
  of 
  sand 
  between 
  the 
  Hogsback 
  and 
  Prospect 
  Park, 
  southwest 
  

   of 
  Clayton, 
  should 
  probably 
  be 
  regarded 
  as 
  eskerlike, 
  while 
  the 
  four 
  

   Prospect 
  Park 
  boulder 
  kames, 
  and 
  the 
  Hogsback 
  also, 
  are 
  parts 
  of 
  

   the 
  chain 
  ; 
  that 
  is, 
  they 
  are 
  all 
  deposits 
  made 
  under 
  variable 
  con- 
  

   ditions 
  by 
  a 
  single 
  glacial 
  river. 
  

  

  True 
  eskers, 
  gravel 
  ridges 
  of 
  fair 
  continuity 
  and 
  uniformity 
  and 
  

   lying 
  in 
  line 
  with 
  the 
  ice 
  flow 
  direction, 
  are 
  regarded 
  as 
  deposits 
  

   in 
  the 
  beds 
  of 
  full 
  loaded 
  glacial 
  streams, 
  either 
  subglacial 
  or 
  su- 
  

   ^erglacial. 
  The 
  true 
  kames 
  are 
  th€ 
  short 
  lived 
  deltas 
  of 
  the 
  streams, 
  

   at 
  their 
  debouchment. 
  Only 
  the 
  streams 
  or 
  their 
  deposits 
  which 
  

   lie 
  in 
  the 
  line 
  of 
  the 
  ice 
  movement 
  could 
  survive. 
  As 
  the 
  ice 
  front 
  

   recedes 
  the 
  kames 
  may 
  bury 
  or 
  mask 
  the 
  less 
  massive 
  upstream 
  or 
  

   esker 
  ridges. 
  

  

  