﻿HUDSON 
  RIVER 
  BEDS 
  NEAR 
  ALBANY 
  581 
  

  

  Dimensions: 
  Tergum: 
  length 
  along 
  keel, 
  9.5 
  mm, 
  width 
  6.7 
  mm; 
  

   length 
  of 
  another 
  specimen 
  (not 
  complete) 
  13 
  mm, 
  width 
  7 
  mm. 
  

   Scutum: 
  length 
  along 
  keel, 
  12.5 
  mm, 
  width 
  7.5 
  mm. 
  Carina: 
  

   length 
  of 
  specimen 
  (upper 
  third 
  missing) 
  12.3 
  mni, 
  width 
  10.2 
  

   mm; 
  length 
  of 
  other 
  large 
  fragment, 
  16 
  mm, 
  width 
  10 
  mm; 
  width 
  

   of 
  another 
  fragment, 
  7 
  mm. 
  Rostrum 
  : 
  length 
  along 
  keel, 
  8.3 
  mm, 
  

   width 
  4.7 
  mm. 
  Upper 
  latus: 
  length 
  6.7 
  mm, 
  width 
  8 
  mm. 
  

  

  Lower 
  Utica 
  shale 
  of 
  Mechanicsyille, 
  Saratoga 
  co. 
  N. 
  Y. 
  Upper 
  

   Utica 
  shale 
  of 
  Green 
  Island, 
  Albany 
  co. 
  N. 
  Y. 
  

  

  DESCRIPTION 
  OF 
  MAP 
  

  

  The 
  roman 
  figures 
  indicate 
  the 
  localities 
  which 
  furnished 
  fos- 
  

   sils 
  and 
  correspond 
  with 
  the 
  numbers 
  of 
  the 
  stations 
  described. 
  

   The 
  boundary 
  lines 
  of 
  the 
  zones 
  or 
  belts 
  have 
  nowhere 
  been 
  ob- 
  

   served 
  directly; 
  they 
  are 
  only 
  approximations 
  obtained 
  from 
  the 
  

   location 
  of 
  the 
  stations. 
  The 
  location 
  of 
  the 
  fault, 
  separating 
  

   the 
  Cambric 
  and 
  Normans 
  kill 
  beds, 
  is 
  taken 
  from 
  Walcott'e 
  

   map 
  of 
  the 
  Taconic 
  region 
  (36). 
  

  

  REFERENCES 
  

  

  1 
  W. 
  W. 
  Mather. 
  Annual 
  report 
  on 
  the 
  geological 
  survey 
  of 
  the 
  first 
  

  

  district. 
  1839 
  

  

  2 
  W. 
  B. 
  & 
  H. 
  D. 
  Rogers. 
  Physical 
  structure 
  of 
  the 
  Appalachian 
  

  

  chain. 
  (Trans. 
  Amer. 
  ass'n 
  geol. 
  and 
  nat. 
  1842. 
  p. 
  474-531) 
  

  

  3 
  Ebenezer 
  Emmons. 
  Geology 
  of 
  New 
  York; 
  rep't 
  on 
  the 
  second 
  dis- 
  

  

  trict. 
  1842 
  

  

  4 
  "W. 
  W. 
  Mather. 
  Geology 
  of 
  New 
  York; 
  rep't 
  on 
  the 
  first 
  district. 
  

  

  1843 
  

  

  5 
  Lardner 
  Vanuxem. 
  Geology 
  of 
  New 
  York; 
  rep't 
  on 
  the 
  third 
  dis- 
  

  

  trict. 
  1842 
  

  

  6 
  James 
  Hall. 
  Geology 
  of 
  New 
  York; 
  rep't 
  on 
  the 
  fourth 
  district. 
  

  

  1843 
  

  

  7 
  Paleontology 
  of 
  New 
  York. 
  1847. 
  v. 
  1 
  

  

  8 
  1859. 
  v. 
  3 
  

  

  9 
  E. 
  Billings. 
  On 
  the 
  occurrence 
  of 
  graptolites 
  in 
  the 
  base 
  of 
  the 
  

   Lower 
  Silurian. 
  (Can. 
  nat. 
  and 
  geol. 
  1861. 
  6:344-48) 
  

  

  10 
  James 
  Hall. 
  Geological 
  report 
  of 
  Wisconsin. 
  1862. 
  p. 
  47 
  (footnote) 
  

  

  11 
  Graptolites 
  of 
  the 
  Quebec 
  group. 
  (Can. 
  org. 
  remains. 
  Decade 
  2. 
  

  

  1865) 
  

  

  12 
  H. 
  A. 
  Nicholson. 
  On 
  some 
  fossils 
  from 
  the 
  Lower 
  Silurian 
  rocks 
  of 
  

   ^ 
  the 
  south 
  of 
  Scotland. 
  (Geol. 
  mag. 
  1867. 
  4:107-13) 
  

  

  