﻿1 
  6 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  season 
  along 
  the 
  lines 
  developed 
  last 
  year. 
  Although 
  less 
  time 
  

   than 
  usual 
  was 
  available 
  for 
  this 
  work, 
  considerable 
  additional 
  area 
  

   was 
  mapped 
  in 
  both 
  the 
  West 
  Point 
  and 
  Carmel 
  quadrangles, 
  some 
  

   portions 
  of 
  which 
  have 
  been 
  studied 
  in 
  detail. 
  

  

  In 
  the 
  discussion 
  of 
  Structural 
  and 
  Stratigraphic 
  Features 
  of 
  the 
  

   Basal 
  Gneisses 
  of 
  the 
  Highlands 
  published 
  last 
  year 
  in 
  Museum 
  

   Bulletin 
  107, 
  the 
  major 
  structural 
  types 
  of 
  the 
  Highlands 
  forma- 
  

   tions 
  were 
  outlined. 
  As 
  a 
  related 
  problem 
  the 
  chief 
  reasons 
  for 
  

   doubting 
  the 
  exact 
  equivalence 
  of 
  the 
  Inwood 
  limestone 
  and 
  Man- 
  

   hattan 
  schist 
  to 
  the 
  Wappinger 
  limestone 
  and 
  Hudson 
  River 
  shales 
  

   were 
  given. 
  A 
  special 
  effort 
  has 
  been 
  made 
  the 
  past 
  season 
  to 
  

   follow 
  out 
  all 
  of 
  the 
  more 
  promising 
  lines 
  of 
  field 
  evidence 
  bearing 
  

   upon 
  this 
  question 
  of 
  stratigraphic 
  succession 
  and 
  correlation. 
  This 
  

   has 
  led 
  to 
  the 
  tracing 
  of 
  the 
  contact 
  lines 
  of 
  the 
  tongues 
  of 
  crystal- 
  

   line 
  limestones 
  and 
  schists 
  that 
  project 
  into 
  the 
  Highlands 
  from 
  the 
  

   south 
  side. 
  If 
  these 
  formations 
  could 
  be 
  followed 
  entirely 
  through 
  

   the 
  Highlands 
  to 
  the 
  north 
  side, 
  as 
  the 
  earlier 
  maps 
  indicate, 
  it 
  was 
  

   believed 
  that 
  some 
  direct 
  relationship 
  between 
  these 
  crystallines 
  of 
  

   the 
  south 
  side 
  and 
  the 
  better 
  known 
  Cambric 
  strata 
  of 
  the 
  northern 
  

   border 
  could 
  be 
  determined. 
  

  

  After 
  studying 
  for 
  this 
  special 
  purpose 
  all 
  of 
  the 
  valleys 
  that 
  

   give 
  such 
  opportunities 
  from 
  the 
  south, 
  it 
  seems 
  necessary 
  to 
  con- 
  

   clude 
  that 
  there 
  is 
  no 
  place 
  in 
  New 
  York 
  where 
  the 
  crystalline 
  

   schists 
  and 
  limestones 
  characteristic 
  of 
  the 
  southerly 
  areas 
  can 
  be 
  

   traced 
  through 
  to 
  the 
  northern 
  border. 
  There 
  is 
  always 
  a 
  belt 
  of 
  

   several 
  miles 
  in 
  width 
  occupied 
  only 
  by 
  the 
  typical 
  gneisses 
  of 
  the 
  

   Highlands. 
  This 
  line 
  of 
  attack 
  therefore 
  furnishes 
  no 
  conclusive 
  

   proof. 
  

  

  Observations 
  made 
  on 
  numerous 
  areas 
  of 
  the 
  Cambric 
  strata 
  of 
  

   the- 
  northern 
  border 
  indicate 
  a 
  much 
  more 
  profound 
  metamorphic 
  

   change 
  in 
  them 
  in 
  passing 
  eastward 
  from 
  the 
  Hudson 
  river 
  to 
  the 
  

   Connecticut 
  line. 
  Limestones 
  and 
  schists, 
  that 
  seem 
  to 
  be 
  beyond 
  

   question 
  equivalents 
  of 
  the 
  Wappinger 
  and 
  Hudson 
  River 
  forma- 
  

   tions, 
  have 
  in 
  that 
  district 
  all 
  the 
  characteristics 
  of 
  the 
  Inwood 
  

   limestone 
  and 
  Manhattan 
  schist 
  of 
  the 
  vicinity 
  of 
  New 
  York 
  city. 
  

  

  With 
  such 
  results 
  in 
  two 
  of 
  the 
  lines 
  of 
  attack, 
  it 
  seems 
  necessary 
  

   to 
  make 
  a 
  more 
  minute 
  study 
  of 
  the 
  Stony 
  Point-Peekskill 
  region, 
  

   the 
  one 
  district 
  where 
  apparently 
  almost 
  typical 
  Cambric 
  formations 
  

   occur 
  on 
  the 
  southern 
  border 
  of 
  the 
  Highlands. 
  

  

  As 
  the 
  mapping 
  of 
  the 
  ancient 
  gneisses 
  progresses 
  it 
  is 
  evident 
  that 
  

   traces 
  of 
  interbedded 
  limestones 
  belonging 
  to 
  the 
  oldest 
  series 
  of 
  

  

  