﻿468 
  Geological 
  Society. 
  

  

  which 
  abstracts 
  are 
  now 
  made, 
  that 
  " 
  this 
  list 
  is 
  only 
  preliminary 
  ," 
  

   and 
  is 
  being 
  daily 
  enlarged." 
  We 
  cannot 
  think 
  that 
  this 
  is 
  good 
  

   news 
  : 
  to 
  judge 
  by 
  one 
  or 
  two 
  of 
  the 
  abstracts 
  near 
  the 
  end 
  of 
  the 
  

   February 
  Part, 
  we 
  should 
  be 
  inclined 
  to 
  say 
  that 
  the 
  list 
  is 
  quite 
  

   large 
  enough 
  already. 
  

  

  The 
  second 
  word 
  of 
  Abstract 
  230 
  should 
  surely 
  be 
  " 
  equitable," 
  

   not 
  " 
  equable." 
  

  

  XL 
  IX. 
  Proceedings 
  of 
  Learned 
  Societies. 
  

  

  GEOLOGICAL 
  SOCIETY. 
  

  

  [Continued 
  from 
  p. 
  284.] 
  

  

  January 
  5th, 
  1898. 
  — 
  Dr. 
  Henry 
  Hicks, 
  P.P.S., 
  President, 
  

  

  in 
  the 
  Chair, 
  

  

  rPHE 
  following 
  communication 
  was 
  read 
  : 
  — 
  

  

  ■*- 
  1. 
  ' 
  On 
  the 
  Structure 
  of 
  the 
  Davos 
  Valley.' 
  By 
  A. 
  Vaughan 
  

  

  Jennings, 
  Esq., 
  P.L.S., 
  P.G.S. 
  

  

  Evidence 
  is 
  brought 
  forward 
  to 
  show 
  that 
  the 
  level 
  area, 
  about 
  

   4 
  miles 
  in 
  length, 
  near 
  Davos 
  is 
  occupied 
  by 
  superficial 
  deposits, 
  

   and 
  that 
  the 
  lateral 
  talus-fans 
  there 
  have 
  been 
  cut 
  through 
  at 
  a 
  

   relatively 
  recent 
  date 
  since 
  their 
  accumulation 
  ; 
  that 
  the 
  northern 
  

   end 
  towards 
  Wolfgang 
  is 
  blocked 
  by 
  moraine-material 
  of 
  great 
  

   thickness, 
  but 
  for 
  which 
  the 
  Davoser 
  See 
  would 
  drain 
  north 
  to 
  the 
  

   Landquart, 
  carrying 
  with 
  it 
  the 
  waters 
  of 
  the 
  Pluela 
  and 
  Dischma 
  ; 
  

   that 
  the 
  contour-lines 
  suggest 
  the 
  former 
  existence 
  of 
  a 
  far 
  larger 
  lake 
  

   stretching 
  south 
  towards 
  Prauenkirch, 
  and 
  that 
  in 
  that 
  part 
  there 
  

   is 
  proof 
  of 
  the 
  previous 
  existence 
  of 
  a 
  great 
  detrital 
  fan 
  sufficient 
  

   to 
  account 
  for 
  the 
  existence 
  of 
  the 
  lake 
  in 
  question. 
  

  

  It 
  is 
  shown 
  that 
  the 
  former 
  ice-movement 
  was 
  not 
  from 
  the 
  

   present 
  watershed 
  between 
  the 
  tributaries 
  of 
  the 
  Landwasser 
  and 
  

   Landquart, 
  but 
  from 
  a 
  spot 
  farther 
  south. 
  

  

  The 
  author 
  concludes 
  that 
  the 
  main 
  valley-systems 
  were 
  marked 
  

   out 
  in 
  pre-Glacial 
  times, 
  and 
  that 
  at 
  one 
  time 
  there 
  was 
  a 
  water- 
  

   shed 
  somewhere 
  between 
  Davos 
  Platz 
  and 
  Prauenkirch. 
  During 
  

   the 
  Glacial 
  Period 
  moraine-material 
  was 
  heaped 
  up 
  across 
  the 
  valley 
  

   below 
  the 
  Hornli, 
  and 
  held 
  up 
  the 
  waters 
  to 
  the 
  south, 
  forming 
  a 
  

   great 
  lake 
  of 
  which 
  the 
  present 
  Davoser 
  See 
  is 
  a 
  relic, 
  the 
  outflow 
  

   being 
  probably 
  over 
  a 
  low 
  saddle 
  near 
  the 
  present 
  Wolfgang 
  ; 
  

   during 
  this 
  time 
  a 
  great 
  moraine 
  and 
  detrital 
  fan 
  existed 
  

   across 
  the 
  valley 
  to 
  the 
  south, 
  and 
  the 
  lake 
  for 
  a 
  long 
  time 
  was 
  

   thus 
  prevented 
  from 
  draining 
  in 
  that 
  direction. 
  After 
  the 
  Glacial 
  

   Period 
  the 
  northern 
  moraine 
  was 
  subjected 
  to 
  little 
  erosion, 
  but 
  the 
  

   southern 
  one, 
  formed 
  from 
  the 
  first 
  of 
  looser 
  material, 
  was 
  rapidly 
  

   cut 
  back 
  by 
  the 
  Sertig 
  Bach, 
  and 
  in 
  time 
  the 
  barrier 
  was 
  so 
  

   weakened 
  as 
  to 
  cause 
  that 
  end 
  of 
  the 
  lake 
  to 
  be 
  tapped, 
  and 
  at 
  that 
  

   time 
  the 
  terraces 
  opposite 
  Prauenkirch 
  ma}' 
  have 
  been 
  levelled, 
  

   while 
  the 
  flow 
  over 
  Wolfgang 
  would 
  be 
  stopped, 
  and 
  the 
  Pluela 
  

   and 
  Dischma 
  streams 
  turned 
  southward 
  ; 
  the 
  Landquart 
  would 
  

   then 
  cut 
  away 
  the 
  margins 
  of 
  the 
  talus-fans 
  which 
  had 
  been 
  accu- 
  

   mulating 
  in 
  the 
  lake. 
  

  

  