﻿86 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  The 
  other 
  belt 
  of 
  thick 
  and 
  prominent 
  outcrops 
  of 
  white-weath- 
  

   ering 
  cherty 
  beds 
  extends 
  across 
  Willard 
  mountain 
  and 
  forms 
  the 
  

   backbone 
  or 
  top 
  of 
  the 
  high 
  ridge 
  extending 
  north 
  from 
  Willard 
  

   mountain, 
  obviously 
  one 
  of 
  the 
  causes 
  that 
  this 
  steep 
  landmark 
  

   has 
  withstood 
  weathering 
  so 
  much 
  better 
  than 
  the 
  surrounding 
  

   land. 
  On 
  top 
  of 
  Willard 
  mountain 
  itself, 
  a 
  ridge 
  about 
  150 
  feet 
  

   wide 
  of 
  white-weathering, 
  vertical 
  or 
  steeply 
  inclined 
  synclinal 
  

   beds 
  is 
  found. 
  The 
  high 
  cliffs 
  on 
  the 
  west 
  brow 
  of 
  Willard 
  moun- 
  

   tain 
  consist 
  principally 
  of 
  this 
  chert, 
  which 
  is 
  again 
  linely 
  exposed 
  

   on 
  the 
  road 
  crossing 
  the 
  ridge 
  north 
  of 
  Willard 
  mountain. 
  It 
  

   extends 
  here 
  along 
  the 
  crest 
  of 
  the 
  ridge 
  to 
  the 
  north 
  point. 
  An- 
  

   other 
  ledge 
  strikes 
  about 
  a 
  mile 
  east 
  of 
  Willard 
  mountain. 
  

  

  A 
  ridge 
  of 
  white 
  beds 
  begins 
  also 
  north 
  of 
  Snake 
  hill 
  at 
  the 
  

   shore 
  of 
  Saratoga 
  lake 
  and 
  can 
  be 
  recognized 
  again 
  2 
  to 
  3 
  miles 
  

   farther 
  northeast. 
  At 
  the 
  lake 
  shore 
  a 
  solid 
  3 
  foot 
  bed 
  of 
  black 
  

   chert 
  was 
  found 
  intercalated 
  in 
  fissile 
  dark 
  shales. 
  This 
  

   chert 
  contained 
  Climacoglraptus 
  bicornis, 
  Glosso- 
  

   graptus, 
  Climacograptus 
  modestus, 
  but 
  not 
  the 
  

   Dicellograptus 
  nicholsoni 
  that 
  occurs 
  all 
  along 
  the 
  

   lake 
  shore 
  in 
  the 
  shales. 
  It 
  would 
  thus 
  seem 
  to 
  be 
  also 
  of 
  Nor- 
  

   manskill 
  age, 
  although 
  it 
  is 
  surrounded 
  by 
  Snake 
  Hill 
  beds. 
  Far- 
  

   ther 
  northeast 
  a 
  thickness 
  of 
  over 
  20 
  feet 
  of 
  this 
  chert 
  has 
  been 
  

   observed 
  on 
  top 
  of 
  the 
  ridge. 
  

  

  The 
  graptolites 
  in 
  the 
  chert 
  are 
  not 
  preserved 
  as 
  carbonaceous 
  

   or 
  pyritized 
  remains 
  as 
  in 
  the 
  argillaceous 
  shales, 
  but 
  are 
  as 
  white 
  

   as 
  the 
  weathered 
  surface 
  of 
  the 
  rock 
  and, 
  wherever 
  present, 
  show 
  

   a 
  striking 
  contrast 
  with 
  the 
  dark 
  rock. 
  It 
  is 
  possible 
  that 
  they 
  

   are 
  also 
  kaolinized, 
  but 
  they 
  may 
  also 
  be 
  composed 
  of 
  the 
  mineral 
  

   giimbelite, 
  a 
  greenish 
  white 
  silicate 
  which 
  has 
  been 
  found 
  in 
  

   Bavaria 
  to 
  have 
  sometimes 
  replaced 
  the 
  carbonaceous 
  tests 
  of 
  

   graptolites. 
  

  

  The 
  Normanskill 
  grit. 
  The 
  white-weathering 
  chert 
  beds 
  are 
  al- 
  

   ways 
  associated, 
  on 
  the 
  Schuylerville 
  quadrangle 
  at 
  least, 
  with 
  the 
  

   Normanskill 
  grit. 
  As 
  in 
  the 
  case 
  of 
  the 
  cherty 
  beds, 
  grit 
  beds 
  

   are 
  also 
  present, 
  though 
  in 
  much 
  less 
  development, 
  in 
  the 
  Snake 
  

   Hill 
  formation. 
  These 
  grits 
  of 
  both 
  formations 
  have 
  been 
  care- 
  

   fully 
  described 
  as 
  Hudson 
  grit 
  by 
  Dale 
  (1899, 
  P 
  a 
  & 
  e 
  l 
  %7)> 
  from 
  

   whom 
  we 
  quote 
  : 
  

  

  The 
  Hudson 
  grit 
  is 
  a 
  rock 
  so 
  marked 
  in 
  its 
  characteristics 
  as 
  to 
  be 
  

   easily 
  identified. 
  It 
  is 
  coarse, 
  grayish, 
  sandy 
  looking. 
  Fresh 
  fracture 
  sur- 
  

   faces 
  are 
  very 
  dark 
  and 
  show 
  glistening 
  glassy 
  quartz 
  grains 
  and 
  very 
  

  

  