﻿r82 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  as 
  described 
  above, 
  whicb 
  closely 
  simulate 
  streams, 
  would 
  neces- 
  

   sarily 
  disprove 
  the 
  theory. 
  In 
  no 
  part 
  of 
  the 
  valleys 
  have 
  deposits 
  

   been 
  found 
  which 
  conld 
  be 
  accounted 
  for 
  in 
  this 
  way. 
  

  

  Another 
  and 
  still 
  more 
  probable 
  condition 
  may 
  be 
  found, 
  which 
  is, 
  

   that 
  the 
  channel 
  ways 
  which 
  so 
  closely 
  simulate 
  streams 
  as 
  above 
  

   described, 
  by 
  the 
  absence 
  of 
  direct 
  and 
  swift 
  drainage 
  become 
  true 
  

   lakes, 
  and 
  the 
  streams 
  entering 
  have 
  their 
  velocities 
  checked 
  and 
  

   their 
  load 
  deposited 
  and 
  developed 
  as 
  a 
  normal 
  delta. 
  In 
  snch 
  an 
  

   event, 
  the 
  delta 
  terraces 
  for 
  the 
  two 
  valley 
  sides 
  and 
  even 
  for 
  the 
  

   same 
  side 
  are 
  built 
  in 
  separate 
  bodies 
  of 
  water, 
  and 
  might 
  therefore, 
  

   show 
  no 
  correlation 
  whatsoever 
  with 
  each 
  other 
  ; 
  also, 
  the 
  lake 
  clay 
  

   and 
  silt 
  should 
  show 
  very 
  irregular 
  distribution, 
  being 
  heavier 
  in 
  

   some 
  places 
  along 
  each 
  side 
  of 
  the 
  valley 
  and 
  entirely 
  absent 
  from 
  

   the 
  middle 
  of 
  the 
  valley. 
  

  

  In 
  his 
  studies 
  of 
  the 
  Malaspina 
  glacier, 
  Russell 
  has 
  shown 
  the 
  

   marginal 
  lake 
  condition 
  to 
  be 
  a 
  very 
  common 
  feature 
  along 
  the 
  ice 
  

   border. 
  Concerning 
  these 
  lakes 
  when 
  comparing 
  the:n 
  with 
  others 
  

   of 
  a 
  somewhat 
  different 
  origin, 
  he 
  says 
  :"- 
  " 
  The 
  conditions 
  which 
  

   lead 
  to 
  the 
  formation 
  of 
  marginal 
  lakes 
  are 
  unstable, 
  and 
  the 
  records 
  

   which 
  the 
  lakes 
  leave 
  in 
  the 
  form 
  of 
  terraces, 
  deltas, 
  etc., 
  are 
  con- 
  

   sequently 
  irregular. 
  When 
  streams 
  flow 
  into 
  one 
  of 
  these 
  lakes, 
  

   deltas 
  and 
  horizontally 
  stratified 
  lake-beds 
  are 
  formed 
  as 
  in 
  ordinary 
  

   water 
  bodies 
  ; 
  but, 
  as 
  the 
  lakes 
  are 
  subject 
  to 
  many 
  fluctuations, 
  the 
  

   elevations 
  at 
  which 
  the 
  records 
  are 
  made 
  are 
  continually 
  changing, 
  

   and 
  in 
  instances 
  like 
  those 
  about 
  the 
  Malaspina 
  glacier, 
  where 
  the 
  

   retaining 
  ice 
  body 
  is 
  constantly 
  diminishing, 
  may 
  occupy 
  a 
  wide 
  

   vertical 
  interval." 
  

  

  During 
  the 
  summer 
  of 
  1^90, 
  the 
  writer 
  had 
  occasion 
  to 
  examine 
  a 
  

   few 
  marginal 
  lakes 
  along 
  the 
  ice 
  border 
  at 
  the 
  base 
  of 
  the 
  Upper 
  

   Kugsuak 
  peninsula 
  in 
  north 
  Greenland, 
  and 
  the 
  conditions 
  existing 
  

   there 
  only 
  add 
  contirmation 
  to 
  those 
  under 
  which 
  the 
  marginal 
  

   lakes 
  of 
  the 
  Malaspina 
  glacier 
  are 
  formed, 
  as 
  stated 
  by 
  Professor 
  

   Russell. 
  In 
  view 
  of 
  these 
  facts, 
  correlation 
  of 
  the 
  deltas 
  occurring 
  

   along 
  the 
  valley 
  sides 
  of 
  the 
  Finger-lakes 
  would 
  be 
  impossible, 
  if 
  

   formed 
  in 
  marginal 
  lakes. 
  

  

  Applying 
  the 
  test 
  in 
  the 
  way 
  of 
  facts 
  as 
  they 
  really 
  exist 
  in 
  these 
  val- 
  

   leys, 
  we 
  And 
  upon 
  examining 
  the 
  table 
  of 
  terraces, 
  a 
  fairly 
  accurate 
  

  

  a 
  Russell. 
  I. 
  C, 
  Glaciers 
  of 
  North 
  America. 
  New 
  York. 
  1897, 
  p. 
  119. 
  

  

  