﻿r24 
  

  

  NEW 
  YORK 
  STATE 
  MUSETJM 
  

  

  Gradual 
  thickening 
  of 
  tlie 
  Ordovician 
  sediments*^ 
  is, 
  moreover, 
  

   shown 
  toward 
  the 
  western 
  part 
  of 
  the 
  state, 
  so 
  that 
  a 
  broader 
  faunal 
  

   range 
  is 
  likel_y 
  to 
  be 
  found 
  there. 
  Correlation 
  with 
  the 
  Trenton 
  

   limestone 
  has 
  been 
  attempted 
  all 
  over 
  the 
  country 
  and 
  this 
  has 
  led 
  

   to 
  much 
  confusion 
  of 
  terms 
  because, 
  although 
  many 
  species 
  have 
  

   been 
  described 
  from 
  various 
  positions 
  in 
  the 
  New 
  York 
  Trenton, 
  no 
  

   systematic 
  study 
  of 
  the 
  saquence 
  of 
  strata 
  and 
  their 
  contained 
  

   faunas 
  within 
  the 
  paleozoic 
  province 
  of 
  Trenton 
  Falls 
  has 
  yet 
  been 
  

   published 
  which 
  embraces 
  all 
  the 
  zones 
  originally 
  deposited 
  in 
  the 
  

   region. 
  Stratigraphic 
  work 
  of 
  this 
  sort 
  has 
  already 
  been 
  done 
  in 
  

   several 
  other 
  groups 
  of 
  the 
  Ordovician, 
  notably 
  for 
  the 
  type 
  section 
  

   of 
  the 
  Chazy 
  formation 
  and 
  the 
  area 
  in 
  its 
  vicinity. 
  (Brainerd 
  and 
  

   iSeely 
  '88, 
  '91, 
  & 
  '96). 
  It 
  has 
  also 
  been 
  done 
  for 
  the 
  Quebec 
  group 
  

   (Logan 
  '63 
  p. 
  227), 
  and 
  for 
  those 
  portions 
  of 
  the 
  Cambrian 
  which 
  

  

  a 
  The 
  rate 
  of 
  this 
  thickening 
  is 
  shown 
  in 
  the 
  following 
  table 
  by 
  the 
  correlation 
  of 
  sections 
  

   at 
  the 
  places 
  mentioned, 
  or 
  in 
  their 
  immediate 
  region 
  ; 
  the 
  localities 
  being 
  in 
  an 
  approximate 
  

   line, 
  over 
  175 
  miles 
  long, 
  extending 
  from 
  west 
  to 
  east 
  across 
  the 
  central 
  part 
  of 
  the 
  state^ 
  

  

  LOCALITIES 
  Rochester^.) 
  Chittenango^.) 
  Utica^.) 
  Amsterdam*.) 
  

  

  DISTANCES 
  <90 
  miles> 
  <32 
  miles> 
  <55 
  iniles> 
  

  

  Clinton 
  ;.. 
  80 
  ft 
  333 
  ft 
  226 
  ft. 
  + 
  

  

  Medina 
  1075 
  

  

  Oswego-Oneida 
  83 
  

  

  Utica- 
  Lorraine 
  598 
  

  

  Birdseye-Trenton.. 
  954 
  

  

  Calciferous 
  137 
  

  

  1) 
  Fairchild 
  '91 
  p. 
  184. 
  

  

  520 
  

  

  107 
  

  

  873 
  

  

  637 
  

  

  329 
  

  

  2) 
  Prosser 
  '93 
  p. 
  108. 
  

  

  ' 
  16ft.+ 
  

  

  " 
  800(«) 
  ft 
  ("attop."j 
  

  

  ■' 
  + 
  350ft.+ 
  37 
  ft. 
  

  

  ' 
  ?..C'180ft 
  gap") 
  ("atbase.") 
  

  

  3) 
  Walcott 
  '88 
  pp. 
  211-212; 
  Prosser 
  '93 
  p. 
  

  

  100; 
  and 
  the 
  present 
  paper, 
  p. 
  r44. 
  4) 
  Darton 
  '93 
  p. 
  630. 
  5) 
  Thickness 
  600 
  feet 
  ace. 
  Walcott 
  

   '83 
  p. 
  1, 
  and 
  710 
  feet 
  according 
  to 
  the 
  same 
  author 
  '90 
  p. 
  347. 
  6) 
  Thickness 
  456 
  feet 
  ace. 
  

   Prosser 
  & 
  Cumings 
  '98 
  p. 
  634. 
  

   The 
  following 
  is 
  a 
  summary 
  of 
  statements 
  by 
  Hall 
  (74) 
  

  

  160 
  miles 
  west 
  of 
  Schoharie 
  in 
  line 
  from 
  

   Seneca 
  or 
  Ontario 
  to 
  Oswego 
  co. 
  

  

  ORISKANY 
  SANDSTONE 
  

  

  f 
  Represented 
  by 
  a 
  few 
  

   LOWER 
  J 
  feet 
  of 
  compact, 
  

   HELDERBERO. 
  | 
  grayish 
  • 
  blue 
  lirae- 
  

   [ 
  stone. 
  

  

  WATER 
  LIME 
  FORMATION 
  

  

  ONONDAGA 
  SALT 
  GROUP 
  

  

  (with 
  gypsum 
  beds 
  loOO'.) 
  

  

  NIAGARA 
  GROUP. 
  ( 
  = 
  Coralline 
  si..).. 
  

  

  CLINTON 
  GROUP 
  

  

  MEDINA 
  SANDSTONE 
  

  

  HUDSON 
  RIVER 
  GROUP 
  

  

  60 
  miles 
  west 
  of 
  Schoharie. 
  

   (Meridian 
  of 
  Utica.) 
  

  

  Present 
  

  

  { 
  Not 
  distinctly 
  developed. 
  

  

  { 
  Indistinguishable 
  

  

  Present 
  

  

  Present 
  

  

  Present 
  

  

  (Red 
  and 
  gray 
  marls.) 
  

  

  Present 
  

  

  Green 
  shales 
  and 
  sand- 
  

   stone 
  with 
  calcareous 
  

   ■{ 
  bands, 
  containing 
  in- 
  

   I 
  terstratified 
  beds 
  of 
  red 
  

   t 
  hematite. 
  

  

  Present 
  

  

  Present 
  

  

  Schoharie 
  valley. 
  

   (Meridian 
  of 
  Amsterdam.) 
  

  

  Present. 
  

  

  Upper 
  Pentamerus 
  

   limestone. 
  

   I 
  Shaly 
  limestone. 
  

   ■< 
  L 
  o 
  w 
  e 
  r 
  Pentamerus 
  

   ( 
  limestone. 
  

  

  Tentaculite 
  limestone. 
  

  

  Present. 
  

  

  Absent. 
  

  

  Present. 
  

  

  Green 
  shale 
  with 
  iron 
  

   pyrite. 
  

  

  "Absent. 
  

   Present. 
  

  

  