﻿64 
  Jillson 
  — 
  Migration 
  of 
  Headwaters. 
  

  

  what 
  softer 
  rock 
  to 
  cut 
  and 
  a 
  much 
  steeper 
  structural 
  

   limb 
  to 
  ascend 
  was 
  more 
  favorably 
  situated 
  than 
  Jenny 
  

   Creek, 
  although 
  Jenny 
  Creek 
  possessed 
  the 
  initial 
  advan- 
  

   tage 
  of 
  a 
  somewhat 
  lower 
  channel. 
  Right 
  Middle 
  Creek, 
  

   a 
  veritable 
  giant, 
  has 
  removed 
  a 
  mountain 
  10 
  miles 
  long, 
  

   has 
  captured 
  the 
  headwaters 
  of 
  its 
  indolent 
  neighbor, 
  the 
  

   Burning 
  Fork, 
  and 
  as 
  a 
  penalty 
  for 
  the 
  theft 
  must 
  for 
  

   the 
  rest 
  of 
  geologic 
  time 
  run 
  backwards 
  and 
  "uphill" 
  

   throughout 
  its 
  upper 
  course. 
  

  

  The 
  migration 
  of 
  the 
  Burning 
  Fork 
  divide, 
  or 
  "gap/ 
  7 
  

   is 
  still 
  in 
  active 
  progress, 
  though 
  it 
  is 
  probable 
  that 
  now 
  

   having 
  reached 
  the 
  top 
  of 
  the 
  Ivyton 
  structure 
  the 
  rate 
  

   of 
  the 
  recession 
  will 
  decrease 
  materially. 
  After 
  pro- 
  

   gressing 
  a 
  little 
  farther 
  northwestward 
  down 
  the 
  fixed 
  

   course 
  of 
  the 
  Burning 
  Fork, 
  the 
  Right 
  Middle 
  Creek 
  

   "gap" 
  will 
  soon 
  come 
  to 
  a 
  more 
  or 
  less 
  stationary 
  posi- 
  

   tion, 
  because 
  the 
  "gap" 
  will 
  have 
  passed 
  over 
  the 
  crest 
  

   of 
  the 
  Ivyton 
  structure, 
  where 
  the 
  factor 
  of 
  reverse 
  dip 
  

   may 
  be 
  expected 
  to 
  operate 
  negatively 
  upon 
  further 
  

   northwestward 
  recession. 
  The 
  influence 
  of 
  this 
  reverse 
  

   dip 
  may 
  reasonably 
  become 
  so 
  strong 
  as 
  to 
  counteract 
  the 
  

   positive 
  forces 
  still 
  operating 
  which 
  favor 
  migration 
  and 
  

   are 
  still 
  maintained 
  by 
  the 
  difference 
  in 
  the 
  initial 
  sur- 
  

   ficial 
  elevation 
  of 
  the 
  waters 
  of 
  this 
  locality 
  which 
  are 
  

   tributary 
  to 
  the 
  Big 
  Sandy 
  and 
  Licking 
  Rivers. 
  

  

  Yale 
  University, 
  

   New 
  Haven, 
  Conn. 
  

  

  