﻿408 
  Forty-seventh 
  Report 
  on 
  the 
  State 
  Museum. 
  

  

  softer 
  underlying 
  beds, 
  give 
  rise 
  to 
  the 
  escarpments. 
  Some 
  fea- 
  

   tures 
  of 
  the 
  beds 
  are 
  shown 
  in 
  the 
  following 
  figure. 
  

  

  

  

  Fig. 
  1.— 
  Pentamerus 
  and 
  Tentaculite 
  becte 
  in 
  a 
  quarry 
  at 
  Howe's 
  Cave, 
  Schoharie 
  county 
  

   Looking 
  northwest. 
  From 
  a 
  photograph. 
  

  

  The 
  color 
  of 
  the 
  rock 
  is 
  a 
  bluish 
  gray, 
  generally 
  weathering 
  to 
  

   a 
  somewhat 
  lighter 
  tint. 
  Besides 
  the 
  thick 
  regular 
  bedding 
  there 
  

   is 
  also 
  an 
  irregular 
  sub-bedding 
  into 
  flat 
  interlocking 
  lenses 
  and 
  

   corrugations, 
  of 
  which 
  the 
  outlines 
  are 
  brought 
  out 
  by 
  weather- 
  

   ing. 
  Occasional 
  slate 
  partings 
  occur, 
  and 
  also 
  nodules 
  of 
  chert, 
  

   especially 
  to 
  the 
  east 
  and 
  south. 
  The 
  character 
  of 
  this 
  member 
  

   is 
  very 
  uniform 
  throughout, 
  and 
  its 
  thickness 
  does 
  not 
  vary 
  

   greatly. 
  At 
  Schoharie 
  its 
  amount 
  is 
  between 
  sixty 
  and 
  seventy 
  

   feet, 
  in 
  the 
  Helderbergs 
  the 
  same, 
  a 
  trifle 
  more 
  about 
  Catskill 
  — 
  

   eighty 
  feet 
  according 
  to 
  Davis 
  — 
  fifty 
  feet 
  at 
  Saugerties, 
  thirty 
  

   to 
  forty 
  feet 
  about 
  Rondout, 
  seventy 
  to 
  one 
  hundred 
  feet 
  about 
  

   Rosendale, 
  the 
  maximum 
  being 
  in 
  the 
  high 
  ridge 
  just 
  northwest 
  

  

  