﻿634 
  Forty-Seventh 
  Report 
  on 
  the 
  State 
  Museum. 
  

  

  appear 
  at 
  times 
  in 
  the 
  gneisses. 
  An 
  exceptionally 
  fine 
  exposure 
  

   of 
  one 
  is 
  just 
  above 
  the 
  station 
  at 
  Hammond 
  ville. 
  In 
  this 
  con- 
  

   nection 
  the 
  great 
  shear-zone 
  at 
  Avalanche 
  lake, 
  often 
  called 
  a 
  

   trap 
  dike, 
  may 
  be 
  cited. 
  It 
  was 
  described 
  by 
  the 
  writer 
  in 
  the 
  

   American 
  Journal 
  of 
  Science 
  for 
  August, 
  1892. 
  

  

  In 
  many 
  cases 
  these 
  faults 
  afforded 
  a 
  start 
  for 
  lines 
  of 
  drainage 
  

   which 
  have 
  now 
  worn 
  out 
  the 
  valleys 
  to 
  broad 
  reaches 
  and 
  have 
  

   masked 
  their 
  origin. 
  The 
  old 
  scarps 
  at 
  present 
  are 
  rounded 
  and 
  

   worn 
  down. 
  But 
  other 
  causes 
  have 
  at 
  times 
  led 
  to 
  depressions. 
  

   The 
  areas 
  marked 
  by 
  the 
  crystalline 
  limestone 
  series 
  of 
  the 
  map 
  

   are 
  for 
  the 
  most 
  part 
  relatively 
  depressed. 
  The 
  central 
  belt 
  of 
  

   Crown 
  Point 
  is 
  of 
  this 
  character, 
  and 
  is 
  doubtless 
  due 
  to 
  the 
  

   easier 
  erosion 
  of 
  the 
  limestone 
  and 
  black 
  gneisses 
  or 
  schists. 
  

   "Where 
  these 
  no 
  longer 
  appear 
  we 
  can 
  not 
  well 
  say 
  that 
  they 
  may 
  

   not 
  have 
  been 
  washed 
  away 
  in 
  the 
  past. 
  Eemnants, 
  such 
  as 
  that 
  in 
  

   Lewis 
  and 
  the 
  one 
  in 
  northern 
  Keene, 
  give 
  this 
  impression 
  strongly. 
  

   Ice 
  in 
  the 
  glacial 
  period 
  has 
  been 
  a 
  strong 
  factor, 
  for 
  these 
  heights 
  

   of 
  land 
  must 
  have 
  been 
  a 
  great 
  center 
  of 
  radiating 
  ice 
  streams. 
  

  

  A 
  word 
  should 
  be 
  said 
  of 
  the 
  ponds 
  and 
  lakes. 
  The 
  whole 
  

   region 
  is 
  plentifully 
  sprinkled 
  with 
  these 
  and 
  to 
  them 
  it 
  owes 
  

   much 
  of 
  its 
  charm 
  of 
  scenery. 
  Many 
  are 
  in 
  the 
  narrow 
  fault 
  

   valleys 
  and 
  at 
  the 
  head 
  of 
  small 
  lines 
  of 
  drainage. 
  Hardly 
  one 
  

   of 
  the 
  " 
  passes 
  " 
  referred 
  to 
  above 
  is 
  without 
  such. 
  Many 
  of 
  

   present 
  existence, 
  or 
  whose 
  record 
  alone 
  remains 
  to 
  us 
  in 
  abandoned 
  

   " 
  lake 
  bott 
  -ms 
  " 
  with 
  side 
  deltas, 
  were 
  backed 
  up 
  by 
  the 
  drift 
  of 
  

   the 
  ice 
  age. 
  The 
  Elizabethtown 
  valley, 
  well 
  described 
  by 
  H. 
  

   Kies 
  (Trans. 
  K 
  Y. 
  Acad. 
  Sci. 
  XIII. 
  107, 
  Nov., 
  1893) 
  from 
  

   observations 
  made 
  during 
  our 
  field 
  work, 
  is 
  of 
  this 
  character. 
  

   We 
  also 
  see 
  them, 
  as 
  in 
  the 
  case 
  of 
  Ensign 
  pond 
  in 
  western 
  Moriah, 
  

   passing 
  into 
  swamps 
  and 
  bogs 
  either 
  from 
  the 
  cutting 
  out 
  of 
  the 
  

   barriers, 
  and 
  consequent 
  draining, 
  or 
  from 
  the 
  encroachment 
  of 
  

   weeds 
  and 
  sediment, 
  as 
  outlined 
  by 
  C. 
  H. 
  Smyth, 
  Jr., 
  for 
  lakes 
  on 
  

   the 
  southwestern 
  side 
  of 
  the 
  mountains. 
  ( 
  Amer. 
  Geol. 
  XI, 
  85, 
  Feb., 
  

   1893.) 
  When 
  the 
  contour 
  maps 
  are 
  all 
  available 
  some 
  extremely 
  

   interesting 
  work 
  will 
  be 
  possible 
  upon 
  these 
  problems. 
  Avalanches 
  

   have 
  been 
  the 
  cause 
  of 
  some 
  lakes 
  in 
  the 
  narrower 
  valleys. 
  The 
  

   Cascade 
  lakes 
  in 
  western 
  Keene 
  are 
  divided 
  by 
  just 
  such 
  a 
  mass 
  

   of 
  debris. 
  Chapel 
  pond 
  in 
  the 
  southeastern 
  portion 
  of 
  the 
  

   same 
  town 
  presents 
  the 
  remarkable 
  case 
  of 
  a 
  pond 
  held 
  in 
  by 
  a 
  

   narrow 
  ridge 
  of 
  loose 
  materials, 
  just 
  the 
  other 
  side 
  of 
  which 
  is 
  a 
  

  

  