﻿42 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  fauna 
  of 
  Becraft 
  mountain, 
  the 
  sole 
  outlier 
  of 
  this 
  stage 
  on 
  the 
  east 
  

   of 
  the 
  Hudson 
  river. 
  This 
  was 
  followed 
  in 
  the 
  year 
  1903 
  by 
  two 
  

   important 
  contributions, 
  one 
  by 
  Stuart 
  Weller 
  on 
  the 
  Paleozoic 
  rocks 
  

   and 
  faunas 
  of 
  New 
  Jersey, 
  in 
  which 
  he 
  discussed 
  the 
  sections 
  at 
  

   the 
  entrance 
  of 
  the 
  western 
  or 
  Port 
  Jervis-Otisville 
  branch 
  of 
  the 
  

   divided 
  Paleozoics 
  of 
  eastern 
  New 
  York 
  and 
  those 
  further 
  south 
  

   in 
  his 
  own 
  state; 
  another 
  by 
  Gilbert 
  van 
  Ingen 
  and 
  P. 
  E. 
  Clark 
  on 
  

   the 
  "Disturbed 
  Rocks 
  in 
  the 
  Vicinity 
  of 
  Rondout, 
  N. 
  Y." 
  [Mus. 
  

   Bui. 
  69] 
  in 
  which 
  all 
  the 
  precise 
  determinations 
  were 
  made 
  by 
  Mr 
  

   van 
  Ingen. 
  

  

  In 
  1905 
  Prof. 
  H. 
  W. 
  Shinier 
  published 
  the 
  paleontology 
  of 
  the 
  

   section 
  at 
  Port 
  Jervis 
  known 
  as 
  Trilobite 
  mountain 
  [Upper 
  Siluric 
  

   and 
  Lower 
  Devonic 
  Faunas 
  of 
  Trilobite 
  Mountain, 
  Orange 
  County, 
  

   N. 
  Y., 
  Mus. 
  Bui. 
  80]. 
  

  

  Prof. 
  George 
  H. 
  Chadwick 
  has 
  recently 
  brought 
  together 
  some 
  

   results 
  of 
  further 
  examinations 
  made 
  for 
  the 
  State 
  Museum, 
  of 
  the 
  

   sections 
  at 
  Rondout 
  and 
  southward 
  into 
  Greene 
  county, 
  with 
  the 
  

   special 
  aim 
  of 
  elucidating 
  the 
  composition 
  of 
  the 
  Port 
  Ewen 
  fauna. 
  

   Though 
  these 
  results 
  have 
  not 
  been 
  put 
  in 
  final 
  form 
  the 
  author's 
  

   determinations 
  are 
  of 
  very 
  considerable 
  interest. 
  

  

  The 
  Port 
  Ewen 
  beds, 
  to 
  rehearse 
  briefly 
  the 
  history 
  of 
  this 
  strati- 
  

   graphic 
  unit, 
  are 
  a 
  series 
  of 
  thin 
  limestones 
  and 
  gray 
  lime 
  shales, 
  

   which, 
  in 
  the 
  Appalachian 
  region 
  of 
  New 
  York 
  and 
  .New 
  Jersey 
  

   lie 
  immediately 
  below 
  the 
  Oriskany 
  silicious 
  limestone 
  and 
  upon 
  the 
  

   Becraft 
  limestone, 
  bear 
  the 
  lithic 
  character 
  of 
  the 
  New 
  Scotland 
  

   lime 
  shales 
  and 
  carry 
  a 
  large 
  percentage 
  of 
  Helderberg 
  fossils. 
  It 
  

   is 
  a 
  division 
  not 
  recognized 
  by 
  the 
  early 
  geologists 
  in 
  their 
  partition 
  

   of 
  the 
  " 
  Lower 
  Helderberg 
  " 
  and 
  it 
  is 
  entirely 
  absent 
  from 
  the 
  suc- 
  

   cession 
  west 
  of 
  Schoharie. 
  Its 
  earliest 
  recognition 
  as 
  a 
  definite 
  

   unit 
  was 
  by 
  Prof. 
  W. 
  M. 
  Davis 
  in 
  1882 
  who 
  termed 
  these 
  rocks 
  

   whose 
  position 
  he 
  determined 
  as 
  above 
  the 
  Becraft 
  limestone, 
  the 
  

   " 
  Upper 
  shaly 
  beds 
  " 
  contrasting 
  them 
  in 
  this 
  designation 
  with 
  the 
  

   " 
  Catskill 
  or 
  Delthyris 
  shaly 
  limestone 
  " 
  below. 
  Professor 
  Davis 
  

   did 
  not 
  attempt 
  to 
  delimit 
  these 
  beds 
  and 
  did 
  actually, 
  according 
  to 
  

   Professor 
  Chadwick, 
  include 
  in 
  his 
  division 
  some 
  part 
  of 
  the 
  

   " 
  Upper 
  Pentamerus 
  limestone." 
  The 
  writer 
  in 
  a 
  joint 
  publication 
  

   with 
  Professor 
  Schuchert 
  [Science, 
  Dec. 
  15, 
  1899], 
  recognizing 
  the 
  

   distinct 
  unit 
  character 
  of 
  these 
  strata 
  termed 
  them 
  the 
  " 
  Kingston 
  

   beds," 
  later 
  substituting 
  for 
  this 
  term, 
  which 
  proved 
  to 
  have 
  been 
  

   employed 
  by 
  the 
  Canadian 
  geologists 
  for 
  a 
  quite 
  different 
  formation, 
  

   the 
  name 
  Port 
  Ewen 
  beds 
  from 
  their 
  exposure 
  near 
  Port 
  Ewen 
  

  

  