﻿ECONOMIC 
  GEOLOGY 
  193 
  

  

  The 
  number 
  of 
  quarries 
  is 
  large 
  and 
  can 
  be 
  increased 
  in- 
  

   definitely, 
  as 
  nearly 
  the 
  whole 
  area 
  of 
  the 
  formation 
  appears 
  

   to 
  be 
  capable 
  of 
  producing 
  stone 
  for 
  flagging 
  or 
  for 
  building. 
  

   The 
  difficulty 
  of 
  indicating 
  the 
  division 
  line 
  between 
  the 
  Hamil- 
  

   ton 
  and 
  the 
  Oneonta 
  and 
  the 
  Hamilton 
  and 
  the 
  Portage 
  groups 
  

   of 
  rocks 
  makes 
  it 
  impossible 
  to 
  refer 
  to 
  localities 
  more 
  particul- 
  

   arly. 
  The 
  quaiTies 
  near 
  Gooperstown, 
  and 
  in 
  the 
  lake 
  region, 
  

   particularly 
  at 
  Atwater, 
  Trumansburg, 
  Watkins 
  and 
  Penn 
  Yan 
  

   belong 
  to 
  the 
  Hamilton 
  group. 
  

  

  Portage 
  group 
  

  

  In 
  this 
  is 
  included 
  the 
  Oneonta 
  sandstone, 
  the 
  limits 
  of 
  which 
  

   at 
  the 
  east 
  can 
  not 
  be 
  indicated; 
  the 
  flagstone 
  beds 
  of 
  the 
  Hud- 
  

   son 
  valley 
  and 
  of 
  the 
  eastern 
  part 
  of 
  the 
  State 
  continue 
  up 
  into 
  

   the 
  Oneonta 
  sandstone 
  horizon. 
  Many 
  of 
  the 
  quarries 
  are 
  in 
  the 
  

   latter 
  formation. 
  The 
  more 
  western 
  and 
  northwestern 
  and 
  higher 
  

   quarries 
  are 
  in 
  it; 
  and 
  some 
  of 
  the 
  Chenango 
  county 
  quarries 
  also. 
  

  

  The 
  Portage 
  rocks 
  in 
  the 
  western 
  part 
  of 
  the 
  State 
  consist 
  of 
  

   shales 
  at 
  the 
  base; 
  then 
  shales 
  and 
  flagstones; 
  and 
  the 
  Portage 
  

   sandstone 
  at 
  the 
  top. 
  In 
  the 
  last 
  division, 
  thick 
  beds 
  with 
  little 
  

   shale 
  are 
  marks 
  of 
  this 
  horizon. 
  The 
  stone 
  is 
  generally 
  fine- 
  

   grained. 
  The 
  quarries 
  near 
  Portage 
  and 
  near 
  Warsaw 
  are 
  in 
  it; 
  

   also 
  the 
  quarries 
  at 
  Laona 
  and 
  Westfield 
  in 
  Chautauqua 
  county. 
  

  

  Although 
  not 
  of 
  as 
  great 
  extent 
  in 
  its 
  outcrop 
  as 
  the 
  Hamilton 
  

   group, 
  the 
  Portage 
  rocks 
  are 
  developed 
  to 
  a 
  thickness 
  of 
  several 
  

   hundred 
  feet 
  along 
  the 
  Genesee 
  river 
  at 
  Mount 
  Morris 
  and 
  at 
  

   Portage; 
  and 
  form 
  a 
  belt 
  having 
  a 
  breadth 
  of 
  several 
  miles 
  

   through 
  Tompkins, 
  Schuyler, 
  Yates, 
  Ontario 
  and 
  Livingston 
  coun- 
  

   ties, 
  and 
  thence 
  west 
  to 
  Lake 
  Erie. 
  The 
  formation 
  is 
  capable 
  of 
  

   supplying 
  an 
  immense 
  amount 
  of 
  good 
  building 
  stone 
  and 
  flag- 
  

   stone 
  throughout 
  its 
  undeveloped 
  territory. 
  

  

  Chemung 
  group 
  

   The 
  rocks 
  of 
  the 
  Chemung 
  group 
  crop 
  out 
  in 
  the 
  southern 
  tier 
  

   of 
  counties, 
  from 
  Lake 
  Erie 
  eastward 
  to 
  the 
  Susquehanna. 
  The 
  

   shales 
  are 
  in 
  excess 
  of 
  the 
  sandstones 
  in 
  many 
  outcrops, 
  and 
  there 
  

  

  