﻿GEOLOGY 
  OF 
  SARATOGA 
  SPRINGS 
  AND 
  VICINITY 
  69 
  

  

  A 
  comparison 
  of 
  the 
  two 
  series 
  of 
  divisions, 
  that 
  for 
  the 
  slate 
  

   belt 
  of 
  Washington 
  county 
  and 
  Vermont 
  and 
  that 
  for 
  Rensselaer 
  

   county, 
  furnished 
  by 
  Dale, 
  shows 
  that 
  the 
  olive 
  grit 
  in 
  the 
  first 
  

   is 
  overlain 
  by 
  a 
  great 
  mass 
  of 
  colored 
  slate, 
  the 
  " 
  Cambric 
  roofing 
  

   slates," 
  and 
  in 
  the 
  latter 
  rests 
  on 
  a 
  still 
  greater 
  mass 
  of 
  colored 
  

   shales 
  ; 
  further 
  that 
  the 
  Cambric 
  roofing 
  slates 
  and 
  the 
  Black 
  patch 
  

   grit 
  are 
  absent 
  in 
  the 
  latter 
  series, 
  where 
  a 
  granular 
  quartzite 
  

   10 
  to 
  40 
  feet 
  thick 
  and 
  a 
  second 
  mass 
  of 
  colored 
  shales 
  25? 
  to 
  

   100+ 
  feet 
  thick 
  intervene 
  between 
  the 
  olive 
  grit 
  and 
  the 
  black 
  

   shale 
  and 
  thin-bedded 
  limestone. 
  In 
  Washington 
  county 
  this 
  is 
  

   followed 
  by 
  another 
  quartz 
  mass, 
  the 
  ferruginous 
  quartzite, 
  and 
  

   in 
  Rensselaer 
  county 
  by 
  greenish 
  shale. 
  

  

  In 
  accordance 
  with 
  the 
  present 
  practice 
  to 
  name 
  the 
  units 
  after 
  

   their 
  type 
  localities 
  instead 
  of 
  their 
  lithologic 
  and 
  faunistic 
  char- 
  

   acteristics 
  and 
  to 
  avoid 
  confusion 
  between 
  the 
  different 
  horizons 
  

   of 
  colored 
  shales 
  and 
  quartzites, 
  we 
  propose 
  here 
  the 
  following 
  

   names 
  for 
  these 
  units: 
  

  

  1 
  Bomoseen 
  grit 
  (olive 
  grit). 
  Olive 
  green 
  grit, 
  nearly 
  a 
  pale 
  

   brick-red. 
  Associated 
  with 
  it 
  in 
  places 
  a 
  bed 
  of 
  quartzite 
  12 
  to 
  

   55 
  feet 
  thick. 
  50 
  to 
  200 
  feet. 
  The 
  type 
  locality 
  of 
  this 
  unit 
  is, 
  

   according 
  to 
  Dale, 
  on 
  the 
  west 
  side 
  of 
  Lake 
  Bomoseen,, 
  Vt, 
  " 
  one- 
  

   quarter 
  of 
  a 
  mile 
  west 
  of 
  the 
  road 
  running 
  north 
  from 
  Hydeville, 
  

   on 
  the 
  north 
  side 
  of 
  road 
  to 
  Fairhaven." 
  It 
  is 
  finely 
  exposed 
  about 
  

   Greenwich, 
  N. 
  Y., 
  especially 
  in 
  ridges 
  northwest 
  of 
  that 
  town, 
  

   and 
  south 
  on 
  Louse 
  hill, 
  but 
  disappears 
  in 
  Rensselaer 
  county 
  where 
  

   it 
  still 
  outcrops 
  east 
  and 
  southeast 
  of 
  Troy. 
  

  

  2 
  Mettawee 
  slate 
  (Cambric 
  roofing 
  slate 
  Dale). 
  See 
  definition, 
  

   page 
  67. 
  These 
  slates 
  extend 
  typically 
  from 
  Pawlet, 
  Vt., 
  and 
  

   Granville, 
  N. 
  Y., 
  to 
  Fairhaven, 
  Vt. 
  The 
  town 
  of 
  Granville, 
  which 
  

   is 
  the 
  center 
  of 
  the 
  industry, 
  would 
  furnish 
  a 
  good 
  name 
  if 
  it 
  were 
  

   not 
  preoccupied. 
  We 
  have 
  therefore 
  taken 
  the 
  name 
  of 
  the 
  Met- 
  

   tawee 
  river 
  which 
  drains 
  the 
  region. 
  

  

  3 
  Eddy 
  Hill 
  grit 
  (Black 
  patch 
  grit). 
  This 
  formation, 
  which 
  is 
  

   defined 
  on 
  page 
  67, 
  is 
  termed 
  from 
  Eddy 
  Hill, 
  near 
  Fairhaven, 
  

   Vt., 
  where 
  it 
  is 
  seen 
  to 
  rest 
  on 
  the 
  Mettawee 
  slate, 
  and 
  carries 
  

   fragments 
  of 
  the 
  Olenellus 
  fauna. 
  Its 
  extension 
  southward 
  is 
  

   not 
  safely 
  established 
  on 
  account 
  of 
  its 
  great 
  similarity 
  to 
  the 
  

   " 
  Hudson 
  " 
  grit. 
  

  

  4 
  Schodack 
  shales 
  and 
  limestones 
  (Cambric 
  black 
  'shale). 
  De- 
  

   fined 
  on 
  page 
  67. 
  This 
  formation 
  of 
  black 
  shales 
  and 
  lime- 
  

   stones 
  always 
  occurs 
  near 
  the 
  top 
  of 
  the 
  Georgian; 
  it 
  is 
  well 
  

  

  