﻿Report 
  of 
  the 
  State 
  Geologist. 
  613 
  

  

  The 
  last 
  lying 
  on 
  the 
  Potsdam 
  sandstone. 
  The 
  two 
  basal 
  

   members 
  are 
  considered 
  the 
  closing 
  deposits 
  of 
  the 
  Cambrian, 
  

   and 
  the 
  opinion 
  is 
  expressed 
  that 
  if 
  a 
  fauna 
  could 
  be 
  found 
  in 
  

   the 
  next 
  bed 
  above, 
  it 
  would 
  probably 
  serve 
  to 
  connect 
  the 
  Cam- 
  

   brian 
  and 
  lower 
  Silurian 
  (Ordovician) 
  faunas. 
  

  

  The 
  oolitic 
  member 
  of 
  the 
  Saratoga 
  region 
  is 
  thus 
  described 
  

   by 
  Steele 
  : 
  * 
  

  

  " 
  The 
  calcareous 
  concretions 
  which 
  characterize 
  and 
  identify 
  

   this 
  formation 
  are 
  for 
  the 
  most 
  part 
  arranged 
  in 
  successive 
  

   layers 
  throughout 
  the 
  strata 
  in 
  which 
  they 
  appear; 
  they 
  are 
  

   globular, 
  of 
  the 
  size 
  of 
  a 
  mustard 
  seed, 
  possess 
  a 
  shining 
  black 
  

   color 
  and 
  are 
  evidently 
  composed 
  of 
  concentric 
  layers. 
  They 
  

   are 
  united 
  in 
  the 
  mass 
  by 
  a 
  calcareous 
  cement, 
  more 
  or 
  less 
  

   granular, 
  combined 
  with 
  fine 
  silicious 
  sand. 
  More 
  than 
  one-half 
  

   of 
  the 
  whole 
  mass 
  of 
  some 
  of 
  the 
  strata, 
  which 
  constitute 
  the 
  

   series 
  of 
  this 
  formation, 
  consists 
  of 
  these 
  globular 
  concretions 
  ; 
  in 
  

   others 
  they 
  are 
  more 
  sparingly 
  diffused." 
  There 
  is 
  associated 
  

   with 
  this 
  stratum 
  a 
  two-foot 
  bed 
  of 
  the 
  Cryptozoon 
  proliferum 
  

   of 
  Hall, 
  which 
  resemble 
  large 
  concretions 
  made 
  up 
  of 
  tubular 
  

   concentric 
  layers 
  of 
  dark 
  color. 
  The 
  principal 
  mass 
  of 
  oolitic 
  

   limestones 
  lie 
  below 
  the 
  Cryptozoon 
  bed, 
  but 
  there 
  are 
  

   oolitic 
  streaks 
  in 
  portions 
  of 
  the 
  immediately 
  overlying 
  

   beds. 
  According 
  to 
  Mather 
  f 
  the 
  Cryptozoon 
  layers 
  are 
  

   exposed 
  at 
  several 
  points 
  about 
  Galway 
  village, 
  and 
  according 
  

   to 
  Yanuxem 
  the 
  oolitic 
  structure 
  is 
  also 
  exhibited 
  at 
  the 
  

   " 
  Noses 
  ; 
  " 
  also 
  a 
  few 
  miles 
  above 
  the 
  paper 
  mill 
  on 
  

   Spruce 
  creek 
  and 
  near 
  Northampton. 
  

  

  North 
  from 
  Saratoga 
  Springs 
  to 
  Lake 
  George 
  there 
  are 
  no 
  

   extensive 
  exposures 
  of 
  the 
  Calciferous 
  sandrock, 
  owing 
  largely 
  

   to 
  the 
  heavy 
  drift 
  cover. 
  Small 
  outcrops 
  are 
  not 
  infrequent, 
  but 
  

   they 
  are 
  of 
  the 
  usual 
  type 
  so 
  far 
  as 
  I 
  could 
  find. 
  At 
  Glens 
  Falls 
  

   a 
  gentle 
  anticlinal 
  brings 
  up 
  the 
  formation 
  so 
  that 
  it 
  is 
  bared 
  by 
  

   the 
  Hudson 
  river 
  over 
  a 
  small 
  area, 
  rising 
  but 
  a 
  few 
  feet 
  above 
  

   water 
  level 
  in 
  the 
  northern 
  bank. 
  Its 
  relations 
  are 
  shown 
  in 
  

   the 
  accompanying 
  plate. 
  

  

  * 
  Loc. 
  cit. 
  p. 
  17. 
  t 
  Loc. 
  cit. 
  p. 
  416. 
  

  

  