﻿72 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  followed 
  by 
  the 
  shales 
  and: 
  limestones 
  of 
  the 
  Schodack 
  beds, 
  the 
  

   whole 
  probably 
  forming 
  an 
  overturned 
  abraded 
  fold. 
  This 
  section 
  

   would 
  then 
  indicate 
  that 
  the 
  normal 
  sequence 
  is 
  Bomoseen 
  grit, 
  

   Bomoseen 
  quartzite, 
  Schodack 
  shales 
  and 
  limestone. 
  

  

  None 
  of 
  the 
  typical 
  roofing 
  slates 
  of 
  the 
  eastern 
  part 
  of 
  the 
  slate 
  

   belt 
  were 
  observed 
  in 
  the 
  Cambric 
  area, 
  but 
  beds 
  of 
  calcareous 
  

   quartzite, 
  and 
  especially 
  brecciated 
  limestones 
  observed 
  in 
  connec- 
  

   tion 
  with 
  the 
  Schodack 
  beds, 
  may 
  represent 
  this 
  division. 
  

  

  The 
  Schodack 
  beds 
  are 
  especially 
  well 
  seen 
  in 
  the 
  northern 
  

   Georgian 
  area 
  of 
  the 
  sheet, 
  where 
  the 
  black 
  and 
  gray 
  shales 
  and 
  

   the 
  interbedded 
  limestones 
  are 
  everywhere 
  exposed 
  along 
  the 
  road 
  

   skirting 
  the 
  base 
  of 
  the 
  Georgian 
  plateau 
  in 
  the 
  town 
  of 
  Argyle. 
  

   This 
  area 
  includes 
  the 
  well-known 
  Bald 
  mountain 
  locality, 
  where 
  

   the 
  black 
  shales 
  are 
  seen 
  with 
  a 
  thin 
  quartzite 
  bed 
  directly 
  above 
  

   the 
  quarry 
  on 
  the 
  west 
  side, 
  while 
  on 
  the 
  south 
  side 
  the 
  olive 
  grit 
  

   has 
  been 
  drawn 
  along 
  the 
  fault 
  line 
  into 
  the 
  shales. 
  On 
  the 
  west- 
  

   ern 
  slope 
  of 
  Bald 
  mountain 
  the 
  thick-bedded, 
  bluish 
  limestones 
  and 
  

   interbedded 
  dark 
  gray 
  to 
  black 
  partly 
  arenaceous 
  shale 
  of 
  the 
  for- 
  

   mation 
  are 
  well 
  exposed. 
  

  

  Walcott, 
  in 
  his 
  monumental 
  monograph 
  of 
  the 
  Cambric 
  Brachio- 
  

   poda 
  (1912, 
  page 
  197), 
  records 
  the 
  following 
  species 
  from 
  this 
  

   neighborhood 
  : 
  

  

  1 
  Limestones 
  1.5 
  miles 
  (2.4 
  Km.) 
  north 
  of 
  Bald 
  mountain: 
  

  

  Obolus 
  prindlei 
  (Walcott) 
  

   Lingulella 
  granvillensis 
  Walcott 
  

   Obolella 
  crassa 
  (Hall) 
  

   Botsfordia 
  caelata 
  (Hall) 
  

   Acrotreta 
  sagittalis 
  taconica 
  (Walcott) 
  

   Stenotheca 
  rugosa 
  (Hall) 
  

   Platyceras 
  primaevum 
  Billings 
  

   Hyolithellus 
  micans 
  Billings 
  

   H. 
  micans 
  rugosa 
  Walcott 
  

   H. 
  communis 
  Billings 
  

   Elliptocephala 
  asaphoides 
  Emmons 
  

   Solenopleura 
  tumida 
  Walcott 
  

  

  2 
  Shaly 
  limestone 
  on 
  the 
  west 
  slope 
  of 
  the 
  summit 
  of 
  Bald 
  

   mountain 
  : 
  

  

  Botsfordia 
  caelata 
  (Hall) 
  

   Acrotreta 
  emmonsi 
  Walcott 
  

   Olenellus 
  sp. 
  

  

  