﻿36 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  Theresa 
  formation 
  is 
  only 
  50 
  to 
  75 
  feet 
  thick 
  and 
  is 
  overlaid 
  by 
  a 
  

   limestone 
  formation, 
  some 
  100 
  feet 
  thick, 
  which 
  contains 
  but 
  little 
  

   interbedded 
  sandstone 
  and 
  is 
  quite 
  fossiliferous. 
  This 
  seems 
  to 
  us 
  

   on 
  the 
  horizon 
  of 
  the 
  upper 
  portion 
  of 
  the 
  Theresa 
  of 
  the 
  sections 
  

   north 
  and 
  west, 
  and 
  we 
  therefore 
  classify 
  it 
  as 
  a 
  member 
  of 
  the 
  

   Theresa 
  formation. 
  

  

  The 
  rock 
  cuts 
  along 
  the 
  Adirondack 
  Railroad, 
  northwest 
  of 
  Sara- 
  

   toga, 
  together 
  with 
  quarries 
  to 
  the 
  south 
  of 
  the 
  railroad, 
  furnish 
  us 
  

   with 
  the 
  best 
  section 
  of 
  this 
  phase 
  of 
  the 
  Theresa 
  formation 
  and 
  

   of 
  the 
  Potsdam 
  beneath. 
  The 
  section 
  has 
  already 
  been 
  published, 
  

   and 
  is 
  here 
  reproduced. 
  1 
  

  

  FEET 
  INCHES 
  

  

  22 
  Rocks 
  concealed 
  between 
  two 
  railroad 
  cuts; 
  

   boundary 
  between 
  Theresa 
  and 
  Hoyt 
  limestone 
  

   member 
  in 
  the 
  interval; 
  thickness 
  about. 
  ...... 
  20 
  .... 
  

  

  21 
  Rotten, 
  brown, 
  calcareous 
  sandstone; 
  blue 
  when 
  

  

  fresh 
  8 
  

  

  20 
  Hard, 
  vitreous, 
  light 
  colored 
  sandstone, 
  banded 
  

   with 
  narrow 
  streaks 
  of 
  darker, 
  calcareous 
  

   sandstone 
  2 
  4 
  

  

  19 
  Thin 
  bedded, 
  blue, 
  calcareous 
  sandstone, 
  weather- 
  

   ing 
  brownish 
  9 
  

  

  18 
  Blue 
  black, 
  oolitic 
  dolomite, 
  frequent 
  rounded 
  

  

  quartz 
  grains, 
  many 
  small 
  drusy 
  cavities 
  1 
  3 
  

  

  17 
  Blue, 
  calcareous 
  sandstone, 
  weathering 
  light 
  col- 
  

   ored, 
  upper 
  portion 
  shaly 
  1 
  8 
  

  

  16 
  Hard, 
  light 
  colored, 
  vitreous 
  sandstone 
  1 
  6 
  

  

  15 
  Thin 
  bedded, 
  calcareous 
  sandstone, 
  somewhat 
  

   oolitic, 
  blue 
  when 
  fresh 
  but 
  rapidly 
  weathering 
  

   brown, 
  mottled 
  and 
  crumbly, 
  many 
  drusy 
  cavi- 
  

   ties 
  with 
  calcite 
  and 
  quartz 
  crystals 
  ; 
  abundant 
  

   trilobite 
  fragments, 
  the 
  lowest 
  zone 
  of 
  these 
  

   so 
  far 
  discovered 
  in 
  the 
  Saratoga 
  region 
  1 
  3 
  

  

  14 
  Light 
  colored, 
  vitreous 
  sandstone 
  2 
  5 
  

  

  13 
  Bluish, 
  nodular, 
  finely 
  crystalline 
  dolomite, 
  with 
  

   a 
  slight 
  amount 
  of 
  calcite 
  cement, 
  shaly 
  at 
  base 
  

   and 
  summit, 
  frequent 
  nodules 
  of 
  crystalline 
  

   calcite 
  ; 
  holds 
  Lingulepis 
  acuminata 
  2 
  3 
  

  

  N. 
  Y. 
  State 
  Mus. 
  Bui. 
  140, 
  p. 
  ni-12. 
  

  

  