﻿Report 
  on 
  the 
  State 
  Geologist. 
  509 
  

  

  limestone 
  are 
  exposed 
  in 
  a 
  railroad 
  cut. 
  Their 
  appearance 
  at 
  

   this 
  point 
  is 
  shown 
  in 
  the 
  following 
  figure. 
  

  

  ■■i 
  

  

  Fig. 
  3.— 
  r>hert 
  layers 
  in 
  Onondaga 
  limestone 
  in 
  cut 
  of 
  West 
  Shore 
  railroad, 
  one 
  mile 
  north 
  of 
  

   Katrire 
  station, 
  New 
  York. 
  

  

  West 
  of 
  the 
  valley 
  and 
  flats 
  underlaid 
  by 
  the 
  Onondaga 
  lime- 
  

   stone 
  there 
  rise 
  deep 
  slopes 
  of 
  Hamilton 
  shales 
  which 
  are 
  remark- 
  

   ably 
  continuous. 
  These 
  slopes 
  rise 
  200 
  feet 
  or 
  more 
  to 
  terraces 
  or 
  

   a 
  terrace-level 
  of 
  the 
  harder 
  flaggy 
  beds 
  of 
  the 
  overlying 
  rim. 
  

   Several 
  creeks 
  flow 
  across 
  this 
  Hamilton 
  shale 
  region, 
  of 
  which 
  

   the 
  largest 
  are 
  the 
  Sawkill 
  and 
  Plattekill, 
  and 
  these 
  afford 
  fine 
  

   exposures 
  of 
  the 
  formations. 
  One 
  particularly 
  fine 
  area 
  is 
  on 
  the 
  

   Plai-tekill 
  a 
  mile 
  west 
  of 
  Mt. 
  Marion 
  station. 
  Mt. 
  Marion 
  is 
  of 
  

   Hamilton 
  rocks 
  with 
  a 
  cap 
  of 
  flags. 
  

  

  The 
  ridge 
  of 
  Helderberg 
  limestones 
  is 
  deeply 
  trenched 
  by 
  

   Esopus 
  creek 
  at 
  Saugerties. 
  To 
  the 
  southward 
  it 
  rises 
  again, 
  pre- 
  

   senting 
  a 
  cliff 
  of 
  moderate 
  height 
  toward 
  the 
  plain 
  eastward. 
  On 
  its 
  

   westward 
  slope 
  there 
  are 
  outcrops 
  of 
  the 
  upper 
  Shaly 
  and 
  Oriskany 
  

   formations, 
  the 
  latter 
  sloping 
  down 
  to 
  Esopus 
  creek, 
  to 
  the 
  west 
  

   of 
  which 
  rise 
  cliffs 
  of 
  Esopus 
  shales. 
  The 
  relations 
  of 
  the 
  

   Oriskany 
  to 
  the 
  overlying 
  formation 
  along 
  this 
  creek 
  are 
  shown 
  

   in 
  plate 
  3. 
  

  

  In 
  this 
  illustration 
  the 
  Oriskany 
  is 
  seen 
  in 
  the 
  low 
  reefs 
  to 
  the 
  

   right, 
  with 
  a 
  reef 
  of 
  a 
  harder 
  bed 
  of 
  Esopus 
  shales 
  and 
  steep 
  

  

  