﻿51 
  » 
  \i:\\ 
  TORE 
  

  

  la» 
  uiiii 
  beds 
  of 
  argillaceous 
  sand 
  

  

  .m.l 
  grittj 
  bands. 
  These 
  rocks 
  haye, 
  in 
  many 
  places, 
  be- 
  

   i-metamorphic 
  ("glazed 
  Bhales" 
  of 
  the 
  older 
  \<w 
  York 
  

   v 
  the 
  Influence 
  of 
  the 
  orogenic 
  forces. 
  Fossils 
  from 
  

   ill. 
  in 
  were 
  known 
  to 
  Vannxem, 
  and 
  the 
  species 
  reported 
  by 
  Hall 
  

   i 
  enumerated 
  above 
  ij>. 
  193). 
  Walcoti 
  remarks 
  that 
  

   this 
  fauna 
  connects 
  the 
  Bhales 
  of 
  the 
  Hudson 
  valley 
  region 
  with 
  

   Frankfort 
  shale 
  fauna 
  of 
  ill.- 
  centra] 
  part 
  of 
  the 
  state. 
  

   The 
  writer 
  had 
  the 
  ^<»od 
  fortune 
  to 
  find 
  an 
  excellent 
  oppor- 
  

   tunity 
  for 
  collecting 
  in 
  the 
  usually 
  very 
  refractory 
  shales 
  by 
  the 
  

   f 
  ditches 
  for 
  the 
  purpose 
  of 
  laying 
  water 
  pipes 
  in 
  the 
  

   ithern 
  pan 
  of 
  Waterford. 
  Here, 
  at 
  the 
  end 
  of 
  Grace 
  street, 
  

   Mohawk, 
  heds 
  of 
  dark 
  argillaceous 
  shales, 
  changing 
  

   through 
  dark 
  sandy 
  shales 
  into 
  ferruginous 
  sandstones, 
  were 
  cut 
  

   into. 
  They 
  furnished: 
  

  

  mis 
  decadactylus, 
  //<///, 
  numerous 
  joints 
  

   Diplograptus 
  pntillus, 
  IhilL 
  several 
  specime 
  

  

  :i 
  form 
  was 
  originally 
  described 
  by 
  Hall 
  (11:44) 
  from 
  the 
  

  

  '" 
  Hu 
  <*son 
  rJ 
  ip 
  of 
  Iowa 
  -. 
  and 
  is 
  also 
  cited 
  by 
  Schuchert 
  from 
  the 
  

  

  "Hudson 
  r 
  oup" 
  near 
  Granger 
  and 
  near 
  SpringvaUey 
  Minn., 
  and 
  

  

  1 
  •''■"' 
  I;l 
  - 
  ""«' 
  " 
  r 
  HaU'a 
  tj 
  reported 
  in 
  Whitfield 
  & 
  Bovey's 
  

  

  from 
  Dubnque 
  la. 
  According 
  to 
  Gurley's 
  

  

  Dtlca 
  horizon 
  (lower 
  Maquoketa 
  shales). 
  

  

  he 
  tower 
  Maquoketa 
  formation 
  plo- 
  

  

  ue 
  does 
  not 
  give 
  any 
  Identification 
  of 
  the 
  Diplo- 
  

  

  at 
  from 
  tin- 
  localities 
  of 
  this 
  horizon, 
  mentio 
  

  

  and 
  Granger 
  Minn.) 
  that 
  Hall's 
  and 
  s.hnr-hert's 
  

  

  rom 
  this 
  horizon. 
  The 
  writer' 
  vations 
  

  

  orm 
  in 
  the 
  whU 
  with 
  these 
  .lata; 
  

  

  Uln 
  ■ 
  and 
  i. 
  iommoo 
  in 
  the 
  Utica 
  Bhale 
  of 
  cer- 
  

  

  lWk 
  valley, 
  illy 
  north 
  o 
  and 
  near 
  the 
  

  

  od 
  I 
  have 
  recently 
  found 
  it 
  In 
  great 
  abundance, 
  

  

  - 
  ra 
  ptus 
  qnadrimucronat 
  ns. 
  | 
  

  

  a 
  minute, 
  andeacribed 
  spinous 
  Dlplograp- 
  

  

  - 
  directly 
  above 
  the 
  Trenton 
  limestone 
  in 
  the 
  

  

  Lake 
  Ohamplain 
  near 
  Panton 
  vt., 
  to 
  

  

  iion 
  was 
  kindly 
  dlreeted'by 
  

  

  Columbia 
  university. 
  

  

  . 
  as 
  its 
  occurrence 
  at 
  Waterford 
  proves, 
  pass 
  

  

  