﻿466 
  Forty-seventh 
  Report 
  on 
  the 
  State 
  Museum. 
  

  

  crumpled, 
  much 
  as 
  is 
  shown 
  in 
  fig. 
  5. 
  The 
  disturbance 
  extends 
  

   only 
  a 
  few 
  feet 
  horizontally 
  and 
  vertically, 
  and 
  beyond 
  these 
  

   limits 
  the 
  laminse 
  are 
  undisturbed. 
  This 
  deformation 
  is 
  here 
  

   evidently 
  due 
  to 
  a 
  washing 
  out 
  of 
  the 
  mobile 
  quicksand 
  leaving 
  

   the 
  clay 
  unsupported, 
  thus 
  allowing 
  it 
  to 
  flow 
  as 
  a 
  viscous 
  body 
  

   until 
  the 
  opening 
  is 
  filled. 
  

  

  Still 
  another 
  phenomenon 
  is 
  shown 
  in 
  fig. 
  3, 
  where 
  a 
  swelling 
  

   and 
  crumpling 
  takes 
  place 
  in 
  the 
  body 
  of 
  the 
  bank 
  and 
  of 
  very 
  

  

  Flj.6. 
  

  

  CrumLlinf 
  of 
  laminae 
  between, 
  fiar 
  all 
  e£ 
  strata*. 
  

  

  limited 
  extent, 
  say 
  from 
  four 
  to 
  six 
  feet 
  in 
  length 
  and 
  from 
  one 
  

   to 
  three 
  feet 
  in 
  height. 
  This 
  maybe 
  but 
  the 
  fading 
  out 
  of 
  a 
  slid- 
  

   ing 
  motion 
  in 
  a 
  plane 
  shown 
  in 
  fig. 
  2, 
  or 
  where 
  an 
  incipient 
  fold 
  

   has 
  taken 
  place 
  instead 
  of 
  a 
  disturbance 
  in 
  a 
  sliding 
  plane. 
  

  

  The 
  above 
  may 
  be 
  but 
  the 
  beginning 
  of 
  a 
  slight 
  faulting 
  

   which 
  is 
  shown 
  in 
  fig. 
  4 
  and 
  which 
  is 
  of 
  frequent 
  occurrence. 
  

  

  dliohtly 
  faulted 
  clcuy 
  str-frta* 
  

  

  All 
  of 
  these 
  phenomena 
  may 
  be 
  explained 
  by 
  the 
  undermining 
  

   of 
  the 
  clay, 
  by 
  the 
  removal 
  of 
  the 
  underlying 
  sand 
  by 
  water, 
  

   and 
  the 
  consequent 
  tilting 
  of 
  the 
  strata 
  if 
  the 
  removal 
  of 
  sand 
  

  

  