﻿20 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  shales, 
  such 
  characteristic 
  graptolites 
  as 
  Didymograptus 
  

   n 
  i 
  t 
  i 
  d 
  u 
  s 
  and 
  Goniograptus 
  thureaui 
  having 
  been 
  

   found 
  in 
  railroad 
  cuts 
  below 
  Stuyvesant. 
  

  

  In 
  southeastern 
  New 
  York 
  the 
  complex 
  problems 
  involved 
  in 
  

   the 
  Tarrytown 
  quadrangle 
  have 
  received 
  attention 
  from 
  Dr 
  

   Charles 
  P. 
  Berkey 
  who 
  has 
  been 
  aided 
  in 
  his 
  interpretations 
  by 
  

   his 
  extensive 
  knowledge 
  of 
  the 
  underground 
  rock 
  structure 
  in 
  

   the 
  course 
  of 
  the 
  Catskill 
  aqueduct. 
  

  

  The 
  Clove 
  quadrangle 
  involving 
  an 
  area 
  of 
  Precambric 
  and 
  

   highly 
  altered 
  Paleozoic 
  rocks 
  east 
  of 
  Poughkeepsie 
  has 
  been 
  

   studied 
  by 
  Prof. 
  C. 
  E. 
  Gordon 
  and 
  for 
  the 
  most 
  part 
  mapped. 
  

   The 
  gneisses 
  of 
  the 
  Highlands 
  extend 
  northward 
  as 
  a 
  huge 
  spur 
  

   in 
  the 
  southeastern 
  part 
  of 
  the 
  quadrangle, 
  and 
  on 
  the 
  west 
  and 
  

   northwest 
  are 
  overlain 
  by 
  and 
  faulted 
  with 
  the 
  lower 
  Cambric 
  

   quartzite 
  which 
  in 
  turn 
  is 
  faulted 
  with 
  the 
  Fishkill 
  limestone. 
  

   Both 
  quartzite 
  and 
  limestone 
  continue 
  northeastward 
  from 
  the 
  

   Poughkeepsie 
  quadrangle 
  and 
  all 
  three 
  associated 
  formations 
  

   present 
  essentially 
  the 
  same 
  relations 
  in 
  both 
  areas. 
  

  

  At 
  Poughquag, 
  in 
  the 
  town 
  of 
  Beekman, 
  is 
  the 
  type 
  locality 
  

   of 
  the 
  basal 
  quartzite 
  of 
  southeastern 
  New 
  York 
  and 
  while 
  fos- 
  

   sils 
  have 
  not 
  yet 
  been 
  found 
  in 
  it, 
  the 
  structural 
  relations 
  clearly 
  

   demonstrate 
  its 
  identity 
  with 
  the 
  rock 
  yielding 
  Olenellus 
  at 
  

   Johnsville 
  in 
  the 
  town 
  of 
  East 
  Fishkill. 
  The 
  basal 
  quartzite 
  

   ends 
  against 
  the 
  schist 
  of 
  West 
  Pawling 
  mountain 
  about 
  two 
  

   miles 
  northeast 
  of 
  Poughquag. 
  Between 
  Poughquag 
  and 
  this 
  

   point, 
  what 
  appears 
  to 
  be 
  the 
  northern 
  margin 
  of 
  the 
  quartzite 
  

   forms 
  " 
  Garden 
  Hollow." 
  The 
  drift 
  is 
  very 
  heavy 
  along 
  the 
  

   northern 
  margin 
  of 
  the 
  Highland 
  spur, 
  forming 
  an 
  exceptionally 
  

   fine 
  drumlin 
  topography 
  near 
  Storm 
  ville, 
  Green 
  Haven 
  and 
  

   Poughquag. 
  Northeast 
  of 
  the 
  last 
  village, 
  it 
  greatly 
  obscures 
  the 
  

   relationships 
  of 
  quartzite, 
  limestone 
  and 
  schist. 
  

  

  The 
  northern 
  boundary 
  of 
  the 
  Fishkill 
  limestone 
  followed 
  east 
  

   from 
  the 
  Poughkeepsie 
  area 
  for 
  a 
  short 
  distance 
  presents 
  the 
  

   same 
  serrated 
  character, 
  a 
  short 
  toothlike 
  spur 
  appearing 
  just 
  

   north 
  of 
  Sylvan 
  lake. 
  It 
  then 
  continues 
  as 
  a 
  long 
  narrow 
  tongue- 
  

   like 
  spur 
  eight 
  or 
  ten 
  miles 
  north 
  of 
  Poughquag 
  in 
  the 
  valley 
  of 
  

   Fishkill 
  creek 
  and 
  forms 
  what 
  is 
  known 
  as 
  the 
  " 
  Clove." 
  In 
  

   tracing 
  the 
  eastern 
  boundary 
  of 
  the 
  limestone 
  with 
  the 
  schist, 
  

   a 
  fine 
  example 
  of 
  coarse 
  fault 
  brecciation 
  was 
  noted 
  a 
  mile 
  and 
  

   a 
  half 
  north 
  of 
  the 
  hamlet 
  of 
  Clove 
  indicating 
  the 
  character 
  of 
  

   the 
  contact. 
  

  

  