﻿Report 
  of 
  the 
  State 
  Geologist. 
  605 
  

  

  The 
  beds 
  about 
  Jessup's 
  Landing 
  are 
  in 
  greater 
  part 
  white, 
  

   light 
  gray 
  to 
  buff, 
  thin 
  and 
  regularly-bedded 
  sandstones. 
  They 
  

   vary 
  from 
  moderately 
  hard 
  to 
  semi-quartzitic. 
  Their 
  contact 
  

   with 
  the 
  crystalline 
  rocks 
  is 
  exposed 
  at 
  a 
  number 
  of 
  points, 
  and 
  

   the 
  basal 
  beds 
  are 
  seen 
  to 
  be 
  locally 
  and 
  irregularly 
  conglomer- 
  

   atic. 
  The 
  floor 
  of 
  crystalline 
  rocks 
  is 
  moderately 
  smooth 
  and 
  

   mainly 
  inclined 
  to 
  the 
  west. 
  Near 
  the 
  falls 
  and 
  mill 
  at 
  Palmer 
  

   the 
  crystalline 
  floor 
  rises 
  up 
  steeply 
  to 
  the 
  east 
  and 
  north. 
  In 
  

   plate 
  5 
  the 
  crystalline 
  rocks 
  are 
  plainly 
  shown 
  in 
  the 
  middle 
  

   ground, 
  extending 
  back 
  to 
  the 
  base 
  of 
  the 
  cliff. 
  The 
  Potsdam 
  

   beds 
  do 
  not 
  appear 
  to 
  cross 
  the 
  river 
  unless 
  possibly 
  to 
  the 
  west- 
  

   ward 
  under 
  drift. 
  The 
  beds 
  are 
  quarried 
  at 
  Jessup's 
  Landing 
  for 
  

   local 
  use, 
  and 
  in 
  the 
  quarries 
  some 
  fine 
  examples 
  of 
  ripple 
  marks 
  

   were 
  noticed. 
  

  

  South 
  from 
  Jessup's 
  Landing 
  exposures 
  are 
  rare, 
  owing 
  to 
  

   heavy 
  drift 
  cover. 
  On 
  the 
  hilltop 
  half-way 
  between 
  South 
  

   Corinth 
  and 
  Porter's 
  Corners 
  an 
  outcrop 
  is 
  seen 
  along 
  the 
  road 
  

   of 
  light-colored, 
  semi-quartzitic 
  slabby 
  sandstone 
  dipping 
  gently 
  

   westward. 
  A 
  thickness 
  of 
  about 
  two 
  feet 
  is 
  exposed 
  over 
  an 
  

   area 
  of 
  fifty 
  square 
  yards. 
  

  

  West 
  of 
  Saratoga 
  Springs 
  the 
  Potsdam 
  is 
  exposed 
  over 
  a 
  con- 
  

   siderable 
  area. 
  For 
  this 
  general 
  region 
  Mr. 
  Walcott 
  * 
  estimates 
  

   the 
  thickness 
  of 
  the 
  Potsdam 
  at 
  200 
  feet, 
  of 
  which 
  about 
  forty 
  

   feet 
  of 
  the 
  upper 
  members 
  are 
  exhibited 
  three 
  miles 
  north 
  of 
  

   Saratoga 
  Springs. 
  The 
  most 
  extensive 
  exposures 
  are 
  in 
  the 
  rail- 
  

   road 
  cuts 
  near 
  South 
  Greenfield, 
  where 
  forty 
  feet 
  of 
  the 
  forma- 
  

   tion 
  are 
  seen 
  just 
  west 
  of 
  the 
  fault. 
  The 
  beds 
  are 
  mostly 
  dark 
  

   gray 
  sandstones, 
  in 
  part 
  quartzitic 
  and 
  from 
  eighteen 
  to 
  twenty- 
  

   four 
  inches 
  thick. 
  There 
  are 
  calcareous 
  layers 
  of 
  light 
  buff 
  

   color, 
  and 
  one 
  dark 
  bed 
  is 
  made 
  of 
  rounded 
  grains 
  of 
  oolitic 
  aspect. 
  

   These 
  beds 
  are 
  overlaid 
  by 
  oolitic 
  limestones 
  half 
  a 
  mile 
  south. 
  

   In 
  the 
  plain 
  east 
  of 
  the 
  fault 
  there 
  are 
  exposures 
  of 
  lower 
  beds 
  

   near 
  the 
  crystalline 
  rocks, 
  which 
  consist 
  of 
  white 
  to 
  gray 
  

   quartzitic 
  sandstones 
  with 
  quartz 
  pebbles 
  in 
  places. 
  These 
  beds 
  

   are 
  separated 
  from 
  the 
  Calciferous 
  on 
  the 
  east 
  by 
  the 
  central 
  

   fault. 
  In 
  the 
  southwestern 
  corner 
  of 
  Greenfield 
  township 
  there 
  

  

  * 
  Second 
  contribution 
  to 
  Studies 
  on 
  the 
  Cambrian 
  Faunas 
  of 
  North 
  America, 
  V. 
  8. 
  Geological 
  

   Survey, 
  Bull. 
  No. 
  81, 
  p. 
  846. 
  

  

  