﻿GEOLOGY 
  OF 
  SARATOGA 
  SPRINGS 
  AND 
  VICINITY 
  8l 
  

  

  In 
  the 
  matrix 
  there 
  was 
  also 
  obtained 
  a 
  specimen 
  of 
  Plectam- 
  

   bonites 
  pisum, 
  a 
  species 
  known 
  from 
  the 
  Rysedorph 
  Hill 
  

   conglomerate 
  at 
  Rysedorph 
  hill. 
  As 
  this 
  conglomerate 
  contains 
  

   pebbles 
  of 
  various 
  ages, 
  from 
  the 
  Georgian 
  to 
  the 
  Mohawkian, 
  

   like 
  that 
  of 
  Rysedorph 
  hill, 
  and 
  lies 
  in 
  the 
  northern 
  continuation 
  

   of 
  the 
  latter 
  and 
  apparently, 
  also 
  as 
  this 
  latter, 
  above 
  or 
  in 
  the 
  upper 
  

   Normanskill 
  shale, 
  we 
  have 
  identified 
  the 
  Bald 
  Mountain 
  con- 
  

   glomerate 
  with 
  the 
  Rysedorph 
  Hill 
  conglomerate. 
  1 
  The 
  occurrence 
  

   of 
  Plectambonites 
  pisum 
  common 
  to 
  both 
  outcrops 
  also 
  

   supports 
  this 
  view. 
  

  

  We 
  surmise 
  that 
  the 
  Trenton 
  fossils 
  formerly 
  recorded 
  from 
  the 
  

   limestone 
  north 
  of 
  Bald 
  mountain 
  came 
  from 
  this 
  conglomerate. 
  

  

  The 
  conglomerate 
  at 
  Bald 
  mountain 
  may 
  reach 
  a 
  considerable 
  

   thickness; 
  in 
  the 
  quarry 
  it 
  is 
  in 
  one 
  place 
  over 
  20 
  feet 
  thick, 
  but 
  

   it 
  is 
  impossible 
  to 
  say 
  how 
  much 
  the 
  folded 
  condition 
  contributes 
  

   .» 
  .his 
  thickness. 
  Along 
  the 
  brook 
  northwest 
  of 
  Bald 
  mountain 
  we 
  

   observed 
  the 
  following 
  section 
  from 
  east 
  to 
  west, 
  the 
  beds 
  being 
  

   nearly 
  all 
  vertical 
  : 
  

  

  1 
  Cambric 
  shale 
  

  

  2 
  Covered 
  90 
  feet 
  

  

  3 
  Limestone 
  with 
  some 
  quartzite 
  and 
  breccia 
  55 
  feet 
  

  

  4 
  Covered 
  270 
  feet 
  

  

  5 
  Conglomerate 
  with 
  large 
  pebbles 
  45 
  feet 
  

  

  Trenton 
  fossils 
  and 
  calcareous 
  matrix 
  

   Rysedorph 
  Hill 
  conglomerate 
  

  

  6 
  Calcareous 
  shale 
  and 
  shaly 
  nodular 
  limestone 
  

  

  (Georgian) 
  200 
  feet 
  

  

  7 
  Covered 
  70 
  feet 
  

  

  8 
  Conglomerate 
  with 
  large 
  pebbles 
  75 
  feet 
  

  

  9 
  Covered 
  

  

  It 
  is 
  possible 
  that 
  the 
  conglomerate 
  bed 
  in 
  no. 
  8 
  is 
  folded 
  upon 
  

   itself, 
  and 
  in 
  no. 
  5 
  the 
  simple 
  thickness 
  of 
  the 
  bed 
  is 
  exposed. 
  It 
  is 
  

   there 
  about 
  45 
  feet 
  thick. 
  

  

  While 
  this 
  conglomerate 
  in 
  its 
  outcrops 
  adjoins 
  the 
  Bald 
  Moun- 
  

   tain 
  limestone, 
  its 
  fossils 
  indicate 
  that 
  it 
  is 
  younger 
  than 
  the 
  typical 
  

   Normanskill 
  shale 
  and 
  intervenes 
  in 
  age 
  between 
  this 
  and 
  the 
  Snake 
  

   Hill 
  shale. 
  It 
  therefore 
  should 
  be 
  separated 
  from 
  the 
  Bald 
  Moun- 
  

   tain 
  limestone 
  by 
  the 
  Normanskill 
  shale. 
  On 
  Rysedorph 
  hill 
  the 
  

  

  1 
  Ruedemann, 
  R. 
  Trenton 
  Conglomerate 
  of 
  Rysedorph 
  hill. 
  N. 
  Y. 
  State 
  

   Mus. 
  Bui. 
  49, 
  p. 
  3. 
  

  

  