﻿50 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  probably 
  has 
  suffered 
  a 
  longer 
  erosion 
  and 
  may 
  for 
  that 
  reason 
  

   be 
  now 
  much 
  reduced 
  in 
  thickness. 
  

  

  The 
  fauna 
  of 
  these 
  shales 
  on 
  the 
  two 
  quadrangles 
  is 
  small 
  but 
  

   present 
  in 
  all 
  outcrops 
  and 
  characteristic 
  of 
  the 
  formation. 
  It 
  con- 
  

   sists 
  of 
  the 
  graptolites 
  : 
  

  

  Corynoides 
  calicularis 
  Nicholson 
  

  

  Dicranograptus 
  nicholsoni 
  Hopkinson 
  

  

  Diplograptus 
  amplexicaulis 
  Hall 
  

  

  D. 
  (Mesograptus) 
  putillus 
  Hall 
  

  

  D. 
  (Mesograptus) 
  mohawkensis 
  Rued. 
  

  

  Climaeograptus 
  spiniferus 
  Rued. 
  

  

  Glossograptus 
  quadrimucronatus 
  mut. 
  cornutus 
  Rued, 
  and 
  

  

  other 
  mutations 
  

   Lasiograptus 
  eucharis 
  (Hall) 
  

  

  Besides 
  these 
  there 
  are 
  met 
  with 
  worms 
  ( 
  Eopolychaetus 
  

   albaniensis 
  and 
  Pontobdellopsis 
  cometa) 
  described 
  

   from 
  this 
  formation 
  by 
  the 
  writer 
  in 
  Bulletin 
  42 
  (1901) 
  and 
  small 
  

   brachiopods 
  ( 
  Le 
  p 
  tobolus 
  insignis 
  Hall, 
  Schizo- 
  

   crania 
  filosa 
  Hall) 
  and 
  a 
  few 
  cephalopods 
  (Trocholites 
  

   a 
  m 
  m 
  o 
  n 
  i 
  u 
  s 
  Conrad, 
  Orthoceras 
  arcuolineatum 
  Rued., 
  

   O. 
  hudsonicum 
  Rued.) 
  and 
  rarely 
  a 
  head 
  of 
  aTriarthrus 
  

   becki. 
  Of 
  these 
  are 
  common 
  only 
  Corynoides 
  calicu- 
  

   laris, 
  Climaeograptus 
  spiniferus, 
  Diplograptus 
  

   amplexicaulis, 
  putillus 
  , 
  mohawkensis 
  and 
  

   Lasiograptus 
  eucharis. 
  Dicranograptus 
  nich- 
  

   olsoni, 
  so 
  common 
  in 
  the 
  Snake 
  Hill 
  beds, 
  is 
  very 
  rare, 
  while 
  

   Lasiograptus 
  eucharis 
  is 
  present 
  in 
  every 
  outcrop 
  ; 
  the 
  

   other 
  graptolites 
  here 
  cited 
  are 
  not 
  always 
  associated 
  but 
  rather 
  

   distributed 
  in 
  subzones 
  of 
  the 
  formation 
  not 
  yet 
  distinguished. 
  

   Thus 
  in 
  Ballston 
  Spa 
  the 
  beds 
  exposed 
  in 
  the 
  village 
  are 
  full 
  of 
  

   Climaeograptus 
  spiniferus 
  and 
  Diplograptus 
  

   amplexicaulis, 
  but 
  going 
  up 
  the 
  Kayaderosseras 
  creek 
  one 
  

   first 
  meets 
  thick-bedded 
  mud 
  shales 
  and 
  above 
  these 
  Glosso- 
  

   graptus 
  quadrimucronatus 
  mut. 
  and 
  Lasiograptus 
  

   eucharis 
  have 
  become 
  the 
  dominant 
  forms. 
  The 
  outcrop 
  at 
  

   the 
  Carlsbad 
  Spring 
  near 
  Saratoga 
  contains 
  : 
  

  

  Diplograptus 
  (Mesograptus) 
  mohawkensis 
  

   Climaeograptus 
  spiniferus, 
  and 
  

   Lasiograptus 
  eucharis 
  

  

  