﻿Report 
  of 
  the 
  State 
  Geologist. 
  401 
  

  

  gray 
  and 
  red 
  shales. 
  The 
  character 
  and 
  relations 
  of 
  this 
  forma- 
  

   tion 
  lead 
  me 
  to 
  believe 
  that 
  it 
  is 
  Clinton 
  in 
  age. 
  and 
  I 
  have 
  so 
  

   represented 
  it 
  in 
  the 
  sections 
  and 
  on 
  the 
  maps. 
  Davis 
  * 
  observed 
  

   it 
  at 
  its 
  northern 
  termination 
  where 
  it 
  overlaps 
  the 
  Hudson 
  river 
  

   shales, 
  and 
  suggested 
  that 
  it 
  was 
  the 
  northern 
  termination 
  of 
  the 
  

   Oneida 
  and 
  Shawangunk 
  grit, 
  but 
  the 
  latter 
  comes 
  in 
  beneath 
  it 
  

   a 
  few 
  miles 
  south 
  and 
  is 
  seen 
  to 
  be 
  entirely 
  separate. 
  

  

  The 
  arenaceous 
  sediments 
  of 
  the 
  Oneida 
  and 
  Medina 
  formations 
  

   thin 
  out 
  and 
  disappear 
  a 
  short 
  distance 
  east 
  of 
  Yoorheesrille 
  in 
  

   the 
  southeastern 
  corner 
  of 
  Herkimer 
  county, 
  and 
  there 
  are 
  no 
  

   traces 
  of 
  their 
  representatives 
  to 
  the 
  east 
  and 
  south 
  to 
  Ulster 
  

   county. 
  Between 
  Eondout 
  and 
  Eosendale 
  the 
  Shawangunk 
  grit 
  

   begins, 
  and 
  this 
  probably 
  is 
  of 
  Oneida 
  and 
  Medina 
  age, 
  either 
  or 
  

   both. 
  It 
  is 
  a 
  white 
  quartzitic 
  conglomerate, 
  which 
  thickens 
  

   rapidly 
  and 
  constitutes 
  the 
  upper 
  part 
  of 
  the 
  Shawangunk 
  moun- 
  

   tain 
  and 
  its 
  southern 
  continuation. 
  In 
  Sullivan 
  county 
  an 
  upper 
  

   member 
  of 
  red 
  and 
  buff 
  sandstones 
  appears 
  in 
  its 
  upper 
  part, 
  and 
  

   increasing 
  greatly 
  in 
  thickness 
  the 
  two 
  members 
  become 
  the 
  

   Oneida 
  and 
  Medina 
  of 
  New 
  Jersey 
  and 
  Pennsylvania 
  geologists, 
  

   and 
  in 
  Yirginia 
  the 
  Massanutten 
  sandstone 
  of 
  Darton. 
  

  

  The 
  Formations. 
  Onondaga 
  limestone. 
  — 
  This 
  is 
  the 
  limestone 
  

   series 
  which 
  is 
  usually 
  termed 
  " 
  Corniferous 
  " 
  by 
  many 
  writers 
  

   but 
  by 
  others 
  the 
  upper 
  member 
  of 
  the 
  series 
  is 
  termed 
  " 
  Cornif- 
  

   erous" 
  and 
  the 
  lower, 
  "Onondaga." 
  As 
  both 
  members 
  are 
  

   cherty, 
  the 
  term 
  " 
  Corniferous" 
  implies 
  a 
  contradistinction 
  which 
  

   does 
  not 
  exist, 
  and 
  it 
  is 
  now 
  proposed 
  by 
  the 
  State 
  Geologist 
  to 
  

   revive 
  the 
  term 
  " 
  Onondaga 
  " 
  to 
  comprise 
  the 
  entire 
  series. 
  It 
  is 
  a 
  

   well-known 
  name 
  in 
  western 
  New 
  York 
  where 
  the 
  beds 
  are 
  

   extensively 
  quarried, 
  and 
  the 
  formation 
  is 
  typically 
  developed 
  in 
  

   the 
  Onondaga 
  region. 
  As 
  the 
  name 
  " 
  Salina 
  " 
  has 
  been 
  finally 
  

   adopted 
  for 
  the 
  salt 
  and 
  gypsum 
  group 
  of 
  the 
  upper 
  Silurian 
  

   there 
  need 
  be 
  no 
  confusion 
  attending 
  the 
  general 
  use 
  of 
  " 
  Onon- 
  

   daga 
  " 
  for 
  the 
  limestone, 
  as 
  proposed. 
  

  

  The 
  subdivisions 
  of 
  the 
  Onondaga 
  limestone 
  gradually 
  lose 
  

   their 
  physical 
  and 
  faunal 
  characteristics 
  in 
  eastern 
  New 
  York 
  

   and 
  the 
  formation 
  is 
  in 
  greater 
  part 
  a 
  light 
  blue-gray 
  subcrystal- 
  

   line, 
  tough, 
  massive 
  pure 
  limestone 
  with 
  lenticular 
  masses 
  of 
  

  

  * 
  The 
  Nonconformity 
  at 
  Rondout, 
  N. 
  Y.; 
  Am. 
  Jour. 
  Sci., 
  3d 
  series, 
  vol. 
  26, 
  pp. 
  889-895. 
  1883 
  

  

  51 
  

  

  