﻿\ 
  FORI 
  I 
  MUSEUM 
  

  

  Trie. 
  i 
  fannaof 
  Mechanics 
  ville 
  with 
  Con 
  . 
  tr,an 
  ton 
  ens 
  is 
  

  

  ami 
  Clima 
  c 
  og 
  r. 
  c 
  a 
  11 
  d 
  a 
  t 
  u 
  b 
  

   Otica 
  fauna 
  of 
  Van 
  Scbaick 
  island 
  with 
  Cryptogr. 
  

  

  r 
  r 
  i 
  c 
  o 
  r 
  n 
  i 
  B 
  

   I 
  ti 
  -j 
  Typical 
  Qtica 
  graptolite 
  fanna 
  of 
  Rural 
  cemetery, 
  etc. 
  

  

  with 
  I) 
  i 
  j» 
  1 
  og 
  r. 
  q 
  d 
  a 
  (1 
  r 
  i 
  in 
  u 
  cro 
  n 
  a 
  t 
  u 
  b 
  and 
  

  

  Di 
  pi 
  ogr. 
  putillns 
  

   Upper 
  (J 
  tica 
  beds 
  of 
  old 
  Dud!' 
  lervatory 
  and 
  Green 
  

  

  Island 
  

   Typical 
  Lorraine 
  beds 
  of 
  Waterford 
  and 
  Block 
  island 
  

  

  Which 
  of 
  these 
  minor 
  faunas 
  constitute 
  constant 
  sub-horizons 
  

   of 
  the 
  larger 
  divisions 
  has 
  not 
  been 
  established 
  thus 
  far; 
  but 
  it 
  is 
  

  

  expected 
  that 
  a 
  continuation 
  of 
  this 
  investigation 
  in 
  the 
  areas 
  

   adjoining 
  north 
  and 
  south 
  will 
  furnish 
  the 
  desired 
  information. 
  

  

  EXPLANATION 
  OF 
  THE 
  OVERTURN 
  OF 
  THE 
  STRATA 
  

  

  All 
  these 
  beds 
  now 
  dip 
  east 
  and 
  the 
  Lorraine 
  beds 
  are, 
  hence, 
  

   the 
  lowest 
  in 
  the 
  g. 
  5, 
  p. 
  556). 
  It 
  is, 
  therefore, 
  neces- 
  

  

  sary 
  to 
  assume 
  either 
  a 
  series 
  of 
  parallel 
  overthrnsts 
  which 
  

   brought 
  up 
  deeper 
  beds 
  successively 
  or 
  a 
  complete 
  overturn 
  of 
  

   tlit- 
  whole 
  scries 
  of 
  strata. 
  The 
  former 
  assumption 
  would 
  seem 
  

   to 
  find 
  Borne 
  support 
  in 
  the 
  abundance 
  of 
  slickensides 
  and 
  small 
  

   faults 
  in 
  some 
  localities, 
  as 
  specially 
  in 
  the 
  Brothers's 
  quarry 
  at 
  

   south 
  Troy 
  and 
  along 
  Dry 
  creek, 
  west 
  of 
  Watervliet 
  But 
  it 
  

   conld 
  hardly 
  be 
  supposed 
  that 
  a 
  Bystem 
  of 
  larger 
  faults 
  could 
  

   produce 
  Buch 
  a 
  regular 
  succession 
  of 
  /.ours 
  following 
  the 
  general 
  

   strike 
  of 
  the 
  beds 
  as 
  thai 
  found 
  in 
  the 
  investigated 
  area, 
  without 
  

  

  ■tition 
  of 
  zones 
  or 
  other 
  irregularities. 
  The 
  slickensides, 
  

  

  li 
  are 
  often 
  not 
  a 
  fool 
  apart, 
  might 
  be 
  assumed 
  to 
  indicate 
  

  

  an 
  upward 
  movement 
  of 
  the 
  entire 
  mass 
  along 
  an 
  intinite 
  number 
  

  

  small 
  faults, 
  such 
  that 
  the 
  more 
  easterly 
  beds 
  were 
  regularly 
  

  

  arther 
  up, 
  in 
  a 
  manner 
  illustrated 
  by 
  Van 
  Hise 
  

  

  to 
  show 
  the 
  possible 
  great 
  surflcial 
  elongation 
  of 
  the 
  crust 
  

  

  small 
  displacements 
  along 
  shearing 
  joints. 
  Under 
  such 
  as- 
  

   sumption 
  the 
  whole 
  orogenio 
  movement 
  would 
  evidently 
  have 
  

  

  D 
  uniform 
  and 
  would 
  have, 
  regularly 
  and 
  gradually, 
  brought 
  

  

  