﻿NEW 
  jfORK 
  81 
  vi 
  i 
  : 
  mi 
  sii 
  \i 
  

  

  cally, 
  bai 
  d 
  investigators 
  and 
  collectors 
  from 
  study- 
  

  

  ing 
  this 
  unfruitful 
  terrene. 
  Thus, 
  For 
  example, 
  the 
  Hudson 
  riv< 
  r 
  

   l( 
  n 
  ..in 
  t»[ 
  consideration 
  by 
  N. 
  II. 
  Darton 
  in 
  his 
  investi- 
  

   mii 
  of 
  the 
  Btratigrapty 
  of 
  the 
  formations 
  of 
  Albany 
  county 
  

  

  The 
  writer 
  has 
  tried 
  to 
  approach 
  the 
  problem 
  h\ 
  systematically 
  

   Qd 
  collecting 
  at 
  all 
  outcrops 
  in 
  a 
  rather 
  limited 
  terri- 
  

   mbradng 
  the 
  hanks 
  of 
  the 
  Hudson 
  river 
  and 
  its 
  tributaries 
  

   between 
  Waterford, 
  8 
  miles 
  north 
  of 
  Albany, 
  and 
  Coeymans, 
  13 
  

   miles 
  Bonth 
  of 
  Albany. 
  This 
  region 
  contains 
  many 
  of 
  the 
  locali- 
  

   ties 
  where 
  fossils 
  were 
  found 
  before, 
  and 
  among 
  them 
  also 
  the 
  

   classic 
  collecting 
  -rounds 
  of 
  the 
  Normans 
  kill 
  (Kenwood) 
  and 
  the 
  

   Abl 
  lenmont). 
  A 
  number 
  of 
  new 
  localities 
  have 
  been 
  found, 
  

  

  which, 
  by 
  their 
  arrangement 
  in 
  zones 
  and 
  by 
  their 
  fossil 
  contents, 
  

   allow 
  a 
  Btep 
  forward 
  toward 
  the 
  solution 
  of 
  the 
  problem 
  and 
  

   justify 
  tl 
  nt 
  publication. 
  

  

  HISTORY 
  OPTHE 
  HUDSON 
  K1VERBEDS 
  

   The 
  history 
  of 
  the 
  problem 
  of 
  the 
  Hudson 
  river 
  beds 
  has 
  been 
  

   treated, 
  though 
  only 
  in 
  regard 
  to 
  the 
  validity 
  of 
  the 
  term, 
  by 
  

   James 
  Hall 
  (17) 
  and 
  C. 
  D. 
  Walcott 
  (36a), 
  to 
  whose 
  papers 
  the 
  

   reader 
  may 
  be 
  referred 
  here. 
  

  

  W. 
  W. 
  Mather 
  

  

  The 
  term 
  " 
  Hudson 
  river 
  slate 
  group" 
  was 
  proposed 
  in 
  1S;{!> 
  

  

  i'\ 
  Mather, 
  in 
  his 
  annual 
  report 
  on 
  the 
  geology 
  of 
  the 
  first 
  dis- 
  

  

  I 
  .. 
  where 
  he 
  Bays 
  (p. 
  212): 
  "(1) 
  The 
  lowest 
  in 
  the 
  series 
  [of 
  

  

  iliferous 
  rocks] 
  is 
  the 
  Hudson 
  river 
  shit, 
  group, 
  consisting 
  of 
  

  

  Blates, 
  shales 
  and 
  grits, 
  with 
  interstratifled 
  limestones, 
  all 
  of 
  

  

  which 
  oc.ur 
  under 
  various 
  modifications. 
  This 
  -roup 
  is 
  overlaid 
  

  

  onconformably 
  in 
  many 
  places 
  by 
  the 
  various 
  rock 
  formations 
  of 
  

  

  in<»; 
  :,i 
  origin." 
  The 
  following 
  fossils 
  (graptolites) 
  are 
  men- 
  

  

  esidea 
  Pew 
  shells: 
  "Fucoidee 
  serra, 
  P. 
  den- 
  

  

  and 
  two 
  other 
  species 
  which 
  arc 
  probably 
  P. 
  line- 
  

  

  and 
  r. 
  ra 
  m 
  alosne 
  

  

  ■ 
  ■■ 
  

  

  