﻿34 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  show 
  the 
  Lorraine 
  to 
  be 
  600 
  feet 
  thick 
  at 
  Lorraine 
  (Jefferson 
  co.) 
  ; 
  

   530 
  feet 
  at 
  Stillwater 
  (Oswego 
  co.) 
  ; 
  549 
  feet 
  at 
  Central 
  Square 
  

   (Oswego 
  CO.) 
  ; 
  640 
  feet 
  at 
  Chittenango 
  (Madison 
  co.) 
  and 
  720 
  

   feet 
  at 
  Vernon 
  (Oneida 
  co.). 
  According 
  to 
  these 
  figures 
  there 
  is 
  

   somewhat 
  of 
  variation 
  in 
  thickness 
  but 
  not 
  in 
  any 
  particular 
  

   direction. 
  

  

  Oswego 
  sandstone 
  

  

  This 
  formation 
  is 
  so 
  named 
  because 
  of 
  its 
  prominence 
  in 
  Oswego 
  

   county. 
  It 
  is 
  the 
  only 
  representative 
  of 
  the 
  Upper 
  Siluric 
  within 
  

   the 
  quadrangle, 
  and 
  corresponds 
  to 
  the 
  gray 
  sandstone 
  of 
  Oswego 
  

   as 
  used 
  in 
  Vanuxem's 
  report. 
  But 
  one 
  small 
  area 
  occurs 
  within 
  

   the 
  map 
  limits 
  and 
  this 
  forms 
  the 
  capping 
  of 
  the 
  highest 
  part 
  of 
  

   Tug 
  hill. 
  This 
  area 
  represents 
  the 
  easternmost 
  extension 
  of 
  the 
  

   formation 
  which 
  occupies 
  many 
  square 
  miles 
  in 
  the 
  southern 
  part 
  

   of 
  Lewis 
  county. 
  The 
  Highmarket 
  quadrangle, 
  immediately 
  to 
  the 
  

   west, 
  is 
  literally 
  strewn 
  with 
  slabs 
  of 
  this 
  sandstone 
  and 
  the 
  region 
  

   is 
  characterized 
  by 
  numerous 
  swamps 
  and 
  a 
  sluggish 
  drainage. 
  

  

  Within 
  the 
  map 
  limits 
  the 
  Oswego 
  sandstone 
  is 
  a 
  gray, 
  fine 
  

   grained, 
  thin 
  bedded 
  rock. 
  The 
  stratification 
  is 
  not 
  very 
  regular 
  and 
  

   practically 
  no 
  shale 
  is 
  present. 
  Fine 
  examples 
  of 
  cross-bedding 
  on 
  

   a 
  small 
  scale 
  are 
  common. 
  A 
  characteristic 
  feature 
  is 
  the 
  presence 
  

   of 
  occasional 
  yellowish 
  spots 
  of 
  limonite, 
  which 
  are 
  no 
  doubt 
  due 
  

   to 
  the 
  alteration 
  of 
  original 
  iron 
  pyrlte. 
  In 
  marked 
  contrast 
  to 
  the 
  

   underlying 
  formation, 
  the 
  rock 
  examined 
  appeared 
  to 
  be 
  barren 
  of 
  

   fossils. 
  The 
  sandstone 
  lies 
  between 
  the 
  2000 
  and 
  2100 
  foot 
  con- 
  

   tours, 
  thus 
  showing 
  a 
  thickness 
  of 
  about 
  100 
  feet 
  but 
  with 
  the 
  top 
  

   not 
  reached. 
  

  

  STRUCTURAL 
  GEOLOGY 
  

   Dip 
  of 
  the 
  Paleozoic 
  formations 
  

  

  Movements 
  since 
  the 
  deposition 
  of 
  the 
  Paleozoic 
  strata 
  have 
  

   given 
  them 
  a 
  very 
  perceptible 
  dip 
  toward 
  the 
  southwest. 
  This 
  dip 
  

   may 
  be 
  determined, 
  In 
  a 
  general 
  way 
  at 
  least, 
  by 
  comparing 
  the 
  alti- 
  

   tudes 
  of 
  given 
  horizons 
  within 
  the 
  Port 
  Leyden 
  quadrangle 
  and 
  

   south 
  and 
  west. 
  For 
  this 
  purpose 
  the 
  top 
  of 
  the 
  Trenton 
  is 
  chosen 
  

   because 
  it 
  Is 
  so 
  clearly 
  recognized 
  in 
  well 
  sections. 
  

  

  The 
  top 
  of 
  the 
  Trenton 
  In 
  the 
  Rome 
  well, 
  as 
  reported 
  by 
  Prosser,* 
  

   IS 
  205 
  feet 
  below 
  sea 
  level, 
  while 
  2 
  miles 
  west 
  of 
  Port 
  Leyden 
  it 
  Is 
  

  

  'Am. 
  Geol. 
  1900. 
  25:137. 
  

  

  