﻿GEOLOGY 
  OF 
  SARATOGA 
  SPRINGS 
  AND 
  VICINITY 
  6/ 
  

  

  established 
  the 
  succession 
  of 
  the 
  subdivisions 
  of 
  the 
  Georgian 
  with 
  

   such 
  accuracy 
  as 
  the 
  great 
  difficulties 
  arising 
  from 
  the 
  extremely 
  

   disturbed 
  condition 
  of 
  the 
  beds 
  will 
  permit. 
  He 
  distinguishes, 
  in 
  

   ascending 
  order 
  (see 
  chart 
  facing 
  page 
  178, 
  op. 
  cit.) 
  : 
  

  

  A 
  Olive 
  grit. 
  Olive 
  green 
  grit 
  (graywacke), 
  more 
  or 
  less 
  

   massive, 
  spangled 
  with 
  minute 
  scales 
  of 
  hematite 
  or 
  graphite, 
  

   sometimes 
  with 
  small 
  quartzite 
  beds, 
  frequently 
  calcareous, 
  gen- 
  

   erally 
  weathering 
  a 
  pale 
  brick 
  red. 
  Associated 
  with 
  it 
  in 
  places 
  

   a 
  bed 
  of 
  quartzite 
  12 
  to 
  55 
  feet 
  thick, 
  50 
  to 
  200 
  feet. 
  

  

  B 
  Cambric 
  roofing 
  slates. 
  Roofing 
  slate, 
  grayish 
  green, 
  purple 
  

   or 
  mixed 
  green 
  and 
  purple, 
  alternating 
  with 
  beds 
  of 
  calcareous 
  

   quartzite 
  up 
  to 
  5 
  feet 
  and 
  limestone 
  breccia 
  up 
  to 
  .40 
  feet 
  thick. 
  

   Fauna 
  : 
  Olenellus 
  ; 
  Microdiscus 
  lobatus, 
  M. 
  spe- 
  

   ciosus 
  ; 
  M. 
  connexus; 
  Solenopleura, 
  possibly 
  

   nana; 
  Obolella; 
  Iphidea 
  pannula; 
  Hyolithes 
  

   communis; 
  Hyolithellus 
  micans; 
  trails 
  of 
  annelids. 
  

   200 
  to 
  240 
  feet. 
  

  

  C 
  Black 
  patch 
  grit. 
  Dark 
  gray 
  grit 
  or 
  sandstone 
  with 
  black 
  

   shaly 
  patches, 
  sometimes 
  with 
  calcareous 
  nodules. 
  Olenellus 
  in 
  

   both 
  grit 
  and 
  calcareous 
  nodules. 
  10 
  to 
  40 
  feet. 
  

  

  D 
  Cambric 
  black 
  shale. 
  Black 
  shale 
  or 
  slate, 
  generally 
  weather- 
  

   ing 
  blue 
  black, 
  sometimes 
  pyritiferous, 
  with 
  thin 
  beds 
  of 
  lime- 
  

   stone 
  and 
  less 
  frequently 
  limestone 
  breccia. 
  Fauna 
  : 
  Linnar- 
  

   sonia 
  sagittalis 
  var. 
  taconica; 
  Orthis, 
  probably 
  

   salemensis; 
  Lingula?; 
  Lingulella 
  coelata 
  ? 
  ; 
  

   Lingulella 
  g 
  r 
  a 
  n 
  v 
  i 
  1 
  1 
  e 
  n 
  s 
  i 
  s 
  ; 
  Hyolithes 
  com- 
  

   munis; 
  Leperditia 
  dermatoidea; 
  Conoco- 
  

   ryphe 
  — 
  sp. 
  ? 
  ; 
  Solenopleura, 
  probably 
  tumida 
  ; 
  a 
  

   phyllocarid 
  crustacean, 
  closely 
  related 
  to 
  Ceratiocaris; 
  

   spicules 
  of 
  Protospongia; 
  also 
  Microdiscus 
  spe- 
  

   ciosus; 
  M. 
  lobatus 
  and 
  Iphidea 
  pannula. 
  50 
  to 
  

   250 
  feet. 
  

  

  E 
  Ferruginous 
  quartzite 
  and 
  sandstone. 
  Quartzite, 
  usually 
  

   with 
  spots 
  of 
  limonite; 
  in 
  places, 
  however, 
  a 
  bluish 
  calcareous 
  

   sandstone 
  (grains 
  of 
  quartz 
  with 
  a 
  calcareous 
  and 
  ferruginous 
  

   cement). 
  25 
  to 
  100 
  feet. 
  

  

  Professor 
  Dale 
  found 
  335 
  to 
  1400 
  feet 
  of 
  Lower 
  Cambric 
  rocks 
  

   exposed 
  but 
  since 
  the 
  thickness 
  of 
  the 
  basal 
  member, 
  the 
  olive 
  

   grit, 
  is 
  not 
  known, 
  the 
  thickness 
  may 
  easily 
  exceed 
  the 
  maximum. 
  

   The 
  upper 
  divisions, 
  C, 
  D 
  and 
  E, 
  are 
  described 
  as 
  intermittent 
  

   and 
  B 
  as 
  often 
  wanting 
  in 
  the 
  western 
  part. 
  

  

  In 
  a 
  later 
  paper 
  Dale 
  1 
  has 
  arranged 
  the 
  Georgian 
  beds 
  of 
  the 
  

   region 
  adjoining 
  south 
  of 
  the 
  one 
  here 
  discussed, 
  somewhat 
  differ- 
  

   ently. 
  He 
  there 
  constructs 
  the 
  following 
  table 
  of 
  formations: 
  

  

  1 
  Dale, 
  T. 
  Nelson. 
  Geology 
  of 
  the 
  Hudson 
  Valley 
  between 
  the 
  Hoosic 
  and 
  

   the 
  Kinderhook. 
  U. 
  S. 
  Geol. 
  Surv. 
  Bui. 
  242, 
  1904, 
  p. 
  29. 
  

  

  