﻿GEOLOGY 
  OF 
  SARATOGA 
  SPRINGS 
  AND 
  VICINITY 
  73 
  

  

  Professor 
  Cushing 
  and 
  the 
  writer 
  collected 
  a 
  number 
  of 
  the 
  

   species 
  here 
  recorded 
  from 
  the 
  first 
  locality 
  and 
  also 
  on 
  Bald 
  

   mountain. 
  

  

  North 
  of 
  Bald 
  mountain 
  the 
  thin-bedded, 
  bluish 
  (50+ 
  feet 
  thick) 
  

   limestone 
  is 
  seen 
  in 
  sections 
  to 
  grade 
  into 
  more 
  massive 
  light 
  gray 
  

   limestone 
  beds 
  which, 
  exposed 
  in 
  cliffs 
  at 
  the 
  fault 
  line, 
  are 
  liable 
  

   to 
  be 
  confounded 
  with 
  the 
  Bald 
  Mountain 
  limestone 
  and 
  may 
  have 
  

   led 
  to 
  the 
  extension 
  of 
  the 
  " 
  Trenton 
  " 
  limestone 
  belt 
  farther 
  north- 
  

   ward 
  than 
  shown 
  on 
  our 
  map. 
  Georgian 
  brachiopods 
  were 
  found 
  in 
  

   this 
  massive 
  limestone 
  bed 
  in 
  at 
  least 
  two 
  localities. 
  These 
  lime- 
  

   stones 
  were 
  seen 
  in 
  several 
  places 
  to 
  rest 
  on 
  black 
  Cambric 
  shales. 
  

   It 
  is 
  therefore 
  probable 
  that 
  the 
  Schodack 
  beds 
  contain 
  here 
  some 
  

   thicker 
  limestone 
  beds 
  than 
  observed 
  in 
  the 
  more 
  eastern 
  region. 
  

  

  The 
  area 
  southeast 
  of 
  Louse 
  hill 
  consists 
  of 
  black 
  shale, 
  a 
  thin- 
  

   bedded 
  limestone 
  with 
  shale 
  seams 
  and 
  quartzitic 
  bands, 
  with 
  a 
  

   great 
  number 
  of 
  quartz 
  veins. 
  

  

  Dark 
  gray 
  shales 
  with 
  brecciated 
  limestone 
  pebbles, 
  the 
  beds 
  

   reaching 
  200 
  feet 
  or 
  more 
  (assuming 
  no 
  repetition) 
  in 
  section 
  given 
  

   on 
  page 
  81, 
  are 
  exposed 
  at 
  the 
  west 
  edge 
  of 
  the 
  Bald 
  mountain 
  

   quarry 
  and 
  in 
  the 
  sections 
  north 
  of 
  it. 
  They 
  are 
  interfolded 
  with 
  

   the 
  Bald 
  Mountain 
  limestone 
  and 
  Rysedorph 
  Hill 
  conglomerate, 
  but 
  

   have 
  the 
  appearance 
  of 
  the 
  Schodack 
  beds, 
  and 
  are 
  probably 
  Georg- 
  

   ian 
  beds 
  forced 
  into 
  the 
  Ordovicic 
  belt 
  near 
  the 
  overthrust 
  plane. 
  

  

  SCHAGHTICOKE 
  SHALE 
  

  

  The 
  Schaghticoke 
  shale 
  with 
  its 
  characteristic 
  faunule, 
  consisting 
  

   of 
  Dictyonema 
  flabelliforme 
  and 
  Staurograptus 
  

   dichotomus 
  Emmons 
  var. 
  a 
  p 
  e 
  r 
  t 
  u 
  s 
  Ruedemann 
  was 
  dis- 
  

   covered 
  by 
  us 
  in 
  a 
  cut 
  of 
  the 
  Hudson 
  Valley 
  Railroad, 
  near 
  the 
  

   mill 
  of 
  the 
  Standard 
  Wall 
  Paper 
  Company 
  about 
  a 
  mile 
  north 
  of 
  

   Schuylerville, 
  and 
  thence 
  traced 
  across 
  the 
  lower 
  part 
  of 
  the 
  rapids 
  

   of 
  the 
  Hudson 
  below 
  Thomson. 
  The 
  entire 
  belt 
  is 
  probably 
  not 
  

   more 
  than 
  1000 
  feet 
  wide 
  and 
  bounded 
  on 
  both 
  sides 
  by 
  outcrops 
  

   of 
  Normanskill 
  shale; 
  its 
  length 
  is 
  unknown 
  since 
  it 
  runs 
  in 
  both 
  

   directions 
  under 
  the 
  drift. 
  The 
  rock 
  in 
  the 
  exposure 
  is 
  much 
  con- 
  

   torted 
  and 
  consists 
  for 
  the 
  most 
  part 
  of 
  light 
  greenish 
  gray, 
  glazed 
  

   argillaceous 
  shale 
  that 
  weathers 
  to 
  a 
  light 
  drab 
  or 
  whitish 
  color 
  

   with 
  intercalations 
  of 
  coarser 
  light 
  bluish 
  gray 
  more 
  or 
  less 
  sandy 
  

   mud 
  shale 
  and 
  small 
  streaks 
  of 
  black 
  shale 
  containing 
  the 
  grap- 
  

   tolites. 
  It 
  also 
  contains 
  a 
  3)/ 
  2 
  feet 
  bed 
  of 
  coarse 
  grit 
  with 
  black 
  

   calcareous 
  and 
  argillaceous 
  pebbles 
  and 
  large, 
  floating, 
  rounded 
  sand 
  

  

  