﻿v 
  JORK 
  si 
  Air. 
  Id 
  

  

  Is 
  wiih 
  the 
  Middleville 
  Bpeclmens 
  <>f 
  l> 
  i 
  \> 
  1 
  o 
  grap 
  - 
  

   t 
  d 
  b 
  a 
  in 
  plexicau 
  1 
  is 
  1 
  with 
  which 
  it 
  was 
  compared. 
  

  

  Station 
  23. 
  Fitzgerald's 
  quarry, 
  Port 
  Schuyler 
  

  

  In 
  James 
  Fitzgerald's 
  qoarry 
  (statioo 
  23) 
  , 
  of 
  a 
  mile 
  south 
  of 
  

  

  the 
  arsenal, 
  at 
  the 
  western 
  terminns 
  <>f 
  Ponrth 
  street 
  in 
  Port 
  

  

  thick 
  bedded 
  may 
  and 
  black 
  argillaceous 
  shales 
  and 
  

  

  nacrous, 
  mica-bearing 
  argiljite 
  are 
  limken 
  for 
  road 
  metal. 
  

  

  The 
  sandy 
  beds 
  contained: 
  

  

  hizocrinns 
  nodosua, 
  Hall 
  

  

  Dalmanella 
  testndinaria, 
  Emmons 
  «p. 
  

  

  Plectorthis 
  plicatella, 
  Hall 
  

  

  Platyetrophia 
  biforata, 
  Schlotheim 
  <sp. 
  

  

  Plectambonil 
  icea, 
  Sow 
  rby 
  >]>. 
  

  

  Katinfs.piina 
  alternata. 
  Conrad 
  sp. 
  

  

  'Diplogaptus 
  amplexicaulis 
  was 
  lirst 
  described 
  by 
  Hall 
  from 
  

  

  the 
  middle 
  Trenton 
  of 
  Trenton 
  Falls 
  and 
  Middleville. 
  There, 
  as 
  well 
  as 
  

  

  at 
  Trenton, 
  it 
  occurs 
  in 
  great 
  profusion 
  in 
  certain 
  beds 
  of 
  the 
  middle 
  

  

  Trenton, 
  while 
  in 
  the 
  Rathbone 
  brook 
  section, 
  south 
  of 
  Trenton 
  Fulls, 
  it 
  

  

  B 
  also 
  observed 
  in 
  beds 
  considered 
  as 
  lower 
  Trenton 
  by 
  Dr 
  Th. 
  A. 
  

  

  White 
  (51:86). 
  Whitfield, 
  as 
  observed 
  (p. 
  496) 
  found 
  it 
  at 
  the 
  Watervliet 
  

  

  arsenal 
  and 
  at 
  south 
  Troy, 
  and 
  based 
  on 
  it 
  his 
  correlation 
  of 
  these 
  

  

  shales 
  with 
  the 
  Trenton. 
  Gurley, 
  who 
  considers 
  it 
  as 
  only 
  a 
  mutation 
  

  

  of 
  D. 
  foliaceus, 
  assigns 
  it 
  to 
  the 
  Chazy 
  (Mystic, 
  Can.) 
  and 
  

  

  Trenton. 
  Joseph 
  V. 
  James 
  records 
  its 
  collection 
  in 
  the 
  typical 
  Maquoketa 
  

  

  lity 
  (Amer. 
  geoL 
  4:237); 
  Walcott 
  mentions 
  its 
  being 
  found 
  in 
  the 
  upper 
  

  

  of 
  the 
  Lorraine 
  section 
  (36a:339); 
  and 
  Whitfield 
  enumerates 
  in 
  

  

  dogue 
  (61:20-21) 
  as 
  D. 
  amplexicaulis 
  a 
  number 
  of 
  Hall's 
  

  

  s 
  of 
  Pal. 
  A. 
  V.. 
  v. 
  1, 
  from 
  Turin, 
  Lorraine. 
  Collins- 
  

  

  ville 
  and 
  the 
  Oxtungo 
  creek. 
  It 
  become 
  apparent 
  from 
  these 
  citations 
  

  

  that 
  this 
  graptollte 
  is 
  of 
  rnther 
  uncertain 
  value 
  as 
  an 
  Index 
  fossil 
  of 
  the 
  

  

  , 
  : 
  it 
  baf 
  .1 
  from 
  bede 
  ..u' 
  from 
  the 
  Chazy 
  to 
  the 
  

  

  Lor: 
  probably 
  the 
  form 
  is 
  not 
  yet 
  well 
  understood 
  or 
  D. 
  foli- 
  

  

  ac« 
  i 
  which 
  it 
  ted, 
  lias 
  been 
  mistaken 
  for 
  it. 
  The 
  

  

  llity 
  of 
  • 
  avo- 
  

  

  •f 
  the 
  rlcibdosome 
  is 
  not 
  observable 
  in 
  flattened 
  iens. 
  

  

  hat 
  in 
  th.- 
  determination 
  of 
  >}..., 
  >imens 
  from 
  the 
  shale 
  one 
  Is 
  restricted 
  

  

  he 
  obse 
  of 
  Hi, 
  ons, 
  outline 
  of 
  thecae 
  and 
  rhabdosome. 
  

  

  character! 
  iver, 
  being 
  Bubject 
  to 
  

  

  lationsii 
  ; 
  • 
  ssure, 
  are 
  often 
  difficult 
  of 
  exact 
  observation. 
  

  

  form 
  to 
  D. 
  foliaceus 
  and 
  it- 
  vertical 
  range 
  

  

  1 
  farth 
  ly. 
  The 
  writer 
  has 
  not 
  seen 
  typical 
  speci- 
  

  

  f 
  younger 
  than 
  middle 
  Trenton 
  age. 
  

  

  