﻿172 
  

  

  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  ceeds. 
  The 
  largest 
  one, 
  a 
  most 
  striking 
  example 
  of 
  this 
  kind, 
  is 
  the 
  

   inlier 
  of 
  Beekm.antown 
  rocks 
  along 
  West 
  Canada 
  creek, 
  extending 
  

  

  nlier 
  

  

  B/a 
  

   li 
  

  

  

  

  Fig. 
  10 
  Diagrammatic 
  section 
  of 
  Three 
  Mile 
  Creek 
  inlier. 
  The 
  black 
  line 
  in- 
  

   dicates 
  the 
  creek. 
  

  

  about 
  12 
  miles 
  from 
  above 
  Poland 
  to 
  a 
  few 
  miles 
  below 
  Middlevijle 
  

   [see 
  text 
  fig. 
  11]. 
  Above 
  the 
  inlier 
  the 
  river 
  flows 
  on 
  Trenton 
  

   limestone 
  and 
  below 
  on 
  alluvium, 
  which, 
  however, 
  rests 
  quite 
  surely 
  

   on 
  Trenton 
  and 
  younger 
  rocks, 
  as 
  evidenced 
  by 
  Cushing's 
  map 
  of 
  

   the 
  Little 
  Falls 
  quadrangle. 
  If 
  it 
  should 
  continue 
  down 
  the 
  river, 
  

   it 
  would 
  be 
  connected 
  with 
  the 
  Little 
  Falls 
  inlier 
  of 
  Beekmantown 
  

   and 
  Precambric 
  rocks, 
  which 
  is 
  principally 
  due 
  to 
  block 
  tilting. 
  

  

  While 
  the 
  West 
  Canada 
  creek 
  inher, 
  

   as 
  we 
  may 
  call 
  it, 
  appears 
  at 
  first 
  

   glance 
  as 
  a 
  sinuple 
  and 
  plain 
  case 
  of 
  

   corrasion 
  inlier, 
  the 
  facts 
  that 
  the 
  

   river 
  there 
  flows 
  parallel 
  to 
  the 
  edge 
  

   of 
  the 
  Precambric 
  boundary 
  of 
  the 
  

   Adirondacks 
  and 
  that 
  the 
  rocks 
  dip 
  

   away 
  from 
  this 
  old 
  land 
  or 
  towards 
  

   the 
  southwest, 
  indicate 
  the 
  possi- 
  

   bility 
  of 
  a 
  more 
  complex 
  origin 
  of 
  

   this 
  inlier. 
  While 
  it 
  might 
  be 
  assumed 
  

   that 
  since 
  the 
  dip 
  is 
  very 
  small 
  (but 
  

   2° 
  according 
  to 
  Cushing), 
  it 
  must 
  be 
  

   easy 
  for 
  the 
  rapidly 
  descending 
  river, 
  

   to 
  overcome 
  the 
  small 
  southern 
  com- 
  

   ponent 
  of 
  this 
  dip 
  and 
  to 
  reach 
  the 
  

   Beekmantown 
  beds, 
  the 
  fact 
  that 
  the 
  

   Precambric 
  rocks 
  appear 
  within 
  the 
  

   Beekmantown 
  beds 
  may 
  indicate 
  that 
  

  

  Fig. 
  II 
  Inlier 
  of 
  Beekmantown 
  

   limestone 
  

  

  limestone 
  

  

  00000 
  

   >o 
  o 
  o 
  od 
  

   O 
  o| 
  

  

  in 
  Trenton 
  

  

  along 
  West 
  Can- 
  

  

  ada 
  creek, 
  N.Y. 
  Scale 
  7.5 
  m. 
  = 
  i 
  i 
  

  

  both 
  Precambric 
  and 
  superjacent 
  Beekmantown 
  rocks 
  formed 
  here 
  

   an 
  old 
  prominence 
  below 
  the 
  Trenton, 
  which 
  has 
  been 
  cut 
  into 
  

   in 
  this 
  inlier. 
  

  

  A 
  plainer 
  and 
  simpler 
  case 
  of 
  an 
  erosion 
  inlier 
  is 
  furnished 
  on 
  

   the 
  Penn 
  Yan-Hammoiidsport 
  sheet 
  oi 
  New 
  York,i 
  where 
  an 
  iso- 
  

  

  ' 
  Luther, 
  D. 
  D. 
  N. 
  Y. 
  State 
  Mus. 
  Bui. 
  loi. 
  1906. 
  

  

  