﻿IRON 
  ORES 
  OF 
  THE 
  CLINTON 
  FORMATION 
  

  

  II 
  

  

  GENERAL 
  GEOLOGY 
  

  

  Stratigraphic 
  relations 
  of 
  the 
  Clinton 
  formation 
  

  

  The 
  Clinton 
  formation 
  falls 
  within 
  the 
  middle 
  division 
  of 
  the 
  

   Upper 
  Siluric 
  or 
  Ontario 
  system. 
  At 
  the 
  base 
  of 
  this 
  system, 
  as 
  con- 
  

   stituted 
  in 
  New 
  York, 
  lies 
  the 
  Oswegan 
  group 
  which 
  includes 
  the 
  

   Medina 
  and 
  Oswego 
  sandstones 
  and 
  the 
  Oneida 
  conglomerate. 
  The 
  

   middle 
  or 
  Niagaran 
  group 
  consists 
  of 
  the 
  Clinton 
  at 
  the 
  base, 
  fol- 
  

   lowed 
  by 
  the 
  Rochester 
  shale 
  and 
  the 
  Lockport 
  and 
  Guelph 
  dolo- 
  

   mites. 
  The 
  upper 
  or 
  Cayugan 
  group 
  is 
  made 
  up, 
  in 
  ascending 
  order, 
  

   of 
  the 
  Salina, 
  Cobleskill, 
  Rondout 
  and 
  Manlius 
  formations. 
  The 
  

   succession 
  is 
  shown 
  in 
  the 
  following 
  table 
  : 
  

  

  ERA 
  02. 
  SYSTEM 
  

  

  Ontario 
  

  

  or 
  

  

  Upper 
  Siluric 
  

  

  PERIOD 
  OR 
  GROUP 
  

  

  Cayugan 
  1 
  

  

  AGE 
  OR 
  STAGE 
  

  

  Niagaran 
  

  

  Oswegan 
  

  

  r 
  Manlius 
  limestone 
  

   Rondout 
  waterlime 
  

   Cobleskill 
  limestone 
  

   Salina 
  beds 
  

  

  ' 
  Guelph 
  dolomite 
  

   Lockport 
  dolomite 
  

   Rochester 
  shale 
  

   Clinton 
  beds 
  

  

  Medina 
  sandstone, 
  including 
  

   the 
  Oswego 
  sandstone 
  and 
  

   Oneida 
  conglomerate 
  

  

  In 
  tracing 
  the 
  Upper 
  Siluric 
  formations 
  across 
  the 
  State 
  it 
  has 
  

   been 
  found 
  that 
  the 
  higher 
  members 
  have 
  a 
  greater 
  linear 
  extent 
  than 
  

   the 
  lower 
  ones. 
  This 
  is 
  due 
  to 
  a 
  progressive 
  overlap 
  in 
  sedimenta- 
  

   tion, 
  whereby 
  each 
  member 
  has 
  had 
  a 
  wider 
  area 
  of 
  deposition 
  

   than 
  the 
  one 
  immediately 
  preceding. 
  The 
  general 
  relations 
  will 
  be 
  

   readily 
  understood 
  from 
  the 
  accompanying 
  diagram. 
  It 
  will 
  be 
  ob- 
  

   served 
  that 
  there 
  is 
  one 
  exception 
  to 
  the 
  statement 
  above 
  in 
  regard 
  

  

  