﻿406 
  Forty-seventh 
  Report 
  on 
  the 
  State 
  Museum. 
  

  

  ulite 
  beds. 
  These 
  members 
  preserve 
  their 
  distinctive 
  characters 
  

   throughout 
  the 
  region 
  to 
  which 
  the 
  report 
  relates, 
  although 
  there 
  

   are 
  occasional 
  slight 
  local 
  variations. 
  

  

  The 
  so-called 
  Scutella 
  beds 
  are 
  the 
  uppermost 
  member 
  south- 
  

   ward 
  to 
  near 
  Catskill. 
  They 
  are 
  a 
  light 
  colored, 
  coarsely 
  semi- 
  

   crystalline, 
  massively 
  bedded, 
  highly 
  fossiliferous 
  limestone, 
  

   blotched 
  with 
  calcite 
  replacements 
  of 
  fossils, 
  of 
  which 
  the 
  most 
  

   conspicuous 
  is 
  the 
  so-called 
  Scutella. 
  These 
  are 
  the 
  cups 
  or 
  pel- 
  

   vis 
  of 
  a 
  crinoid, 
  having 
  a 
  diameter 
  in 
  greater 
  part 
  from 
  one 
  to 
  

   two 
  inches, 
  and 
  the 
  white 
  calcite 
  of 
  which 
  they 
  consist 
  contrasts 
  

   strongly 
  with 
  the 
  light 
  bluish 
  gray 
  of 
  the 
  containing 
  limestone. 
  

   In 
  the 
  Schoharie 
  region, 
  where 
  these 
  cups 
  characterize 
  the 
  

   lower 
  beds 
  of 
  the 
  member, 
  the 
  overlying 
  layers 
  have 
  been 
  

   called 
  the 
  upper 
  Pentamerus 
  beds 
  from 
  the 
  P. 
  pseudogaleatus 
  

   which 
  they 
  contain, 
  and 
  this 
  nam 
  a 
  has 
  also 
  been 
  employed 
  

   to 
  some 
  extent 
  to 
  comprise 
  all 
  the 
  beds. 
  In 
  the 
  eastern 
  

   extension 
  of 
  the 
  formation 
  the 
  distinction 
  is 
  lost. 
  About 
  

   Catskill, 
  Davis 
  designates 
  the 
  lower 
  layers 
  the 
  " 
  Encrinal 
  " 
  and 
  

   the 
  upper 
  layers 
  the 
  " 
  upper 
  Pentamerus 
  " 
  limestone. 
  Owing 
  to 
  

   the 
  inappropriateness 
  of 
  the 
  name 
  "Scutella" 
  and 
  the 
  varying 
  

   significance 
  of 
  the 
  other 
  terms 
  which 
  have 
  been 
  employed, 
  the 
  

   geographic 
  name 
  of 
  Becraft 
  limestone 
  has 
  been 
  suggested 
  to 
  me 
  

   by 
  Dr. 
  Hall. 
  The 
  name 
  is 
  from. 
  Becraft's 
  mountain 
  in 
  Columbia 
  

   county 
  where 
  the 
  rock 
  is 
  typically 
  developed. 
  The 
  Becraft 
  lime- 
  

   stone 
  has 
  a 
  thickness 
  of 
  ten 
  to 
  fifteen 
  feet 
  about 
  Schoharie 
  and 
  

   the 
  amount 
  does 
  not 
  vary 
  greatly 
  eastward 
  to 
  the 
  Helderberg 
  

   mountains 
  and 
  by 
  Clarksville, 
  Aquetuck 
  and 
  Coxsackie. 
  Thence 
  

   it 
  increases 
  rapidly 
  and 
  Davis 
  reports 
  a 
  thickness 
  of 
  ] 
  20 
  feet 
  below 
  

   Leeds, 
  the 
  upper 
  ten 
  feet 
  consisting 
  of 
  impure 
  sandy 
  and 
  shaly 
  

   layers. 
  There 
  are, 
  as 
  Davis 
  suggests, 
  many 
  local 
  slips 
  in 
  this 
  

   section 
  and 
  my 
  estimate 
  of 
  the 
  thickness 
  of 
  the 
  purer 
  limestone 
  

   would 
  be 
  about 
  sixty 
  feet. 
  The 
  sandy 
  and 
  shaly 
  beds 
  are 
  the 
  

   beginning 
  either 
  of 
  a 
  separate 
  later 
  deposit, 
  or 
  an 
  expansion 
  of 
  

   the 
  Becraft 
  deposit, 
  which 
  rapidly 
  increases 
  in 
  thickness 
  south- 
  

   ward 
  and 
  is 
  the 
  "upper 
  Shaly 
  limestone" 
  differentiated 
  by 
  Davis 
  

   about 
  Kondout. 
  In 
  the 
  vicinity 
  of 
  Saugerties 
  the 
  Becraft 
  lime- 
  

   stone 
  is 
  of 
  the 
  usual 
  light-gray, 
  massive, 
  coarse-grained 
  fossilif- 
  

   erous 
  character 
  and 
  has 
  a 
  thickness 
  of 
  twenty-two 
  feet. 
  It 
  gives 
  

  

  