﻿GEOLOGY 
  OF 
  THOUSAND 
  ISLANDS 
  REGION 
  75 
  

  

  Both 
  these 
  sections 
  are 
  imperfect 
  in 
  their 
  showing 
  of 
  the 
  beds 
  

   of 
  the 
  extreme 
  summit. 
  The 
  most 
  excellent 
  section 
  shown 
  in 
  the 
  

   railway 
  cuts 
  just 
  south 
  of 
  Sanford 
  Corners 
  (southeastern 
  part 
  of 
  

   Theresa 
  quadrangle) 
  supplies 
  this 
  deficiency 
  [pi. 
  i8]. 
  

  

  i' 
  4" 
  Two 
  8'' 
  layers 
  of 
  blue 
  gray, 
  crystalline 
  limestone, 
  abundant 
  lamelli- 
  

  

  branch 
  casts 
  full 
  of 
  crystalline 
  calcite; 
  dove 
  limestone 
  mud 
  balls 
  

  

  1' 
  Mud 
  cracked, 
  argillaceous, 
  somewhat 
  granular, 
  bluish 
  limestone, 
  

  

  weathering 
  yellowish 
  

   i' 
  Thin 
  bedded, 
  blue, 
  granular 
  limestone, 
  conglomeratic, 
  quite 
  shaly 
  

  

  below, 
  very 
  fossiliferous, 
  chiefly 
  bryozoa; 
  base 
  of 
  Lowville 
  

   11" 
  Dove 
  gray, 
  fine, 
  impure 
  limestone, 
  weathering 
  light 
  

   3' 
  2" 
  Laminated, 
  mud 
  cracked, 
  gray 
  dove, 
  argillaceous 
  limestone, 
  thin 
  

  

  bedded, 
  ripple-marked, 
  worm-burrowed 
  

   i' 
  9" 
  A 
  6" 
  layer 
  below 
  and 
  an 
  upper 
  15" 
  bed; 
  fine 
  dove 
  limestone 
  with 
  

  

  calcite 
  spots, 
  gastropods 
  and 
  cephalopods 
  

   i' 
  10" 
  Gray, 
  granular 
  limestone, 
  crystalline 
  specks 
  and 
  spots; 
  shaly 
  

  

  below, 
  more 
  massive 
  above 
  

   5' 
  6" 
  Finely 
  granular, 
  blue 
  dove 
  limestone, 
  shaly 
  below, 
  more 
  solid 
  

   above; 
  blocky 
  weathering; 
  calcite 
  seams 
  and 
  spots; 
  sparse 
  

   Phytopsis 
  in 
  upper 
  part 
  

   4' 
  6" 
  Mottled, 
  blue 
  dove 
  limestone, 
  thin 
  bedded 
  above 
  and 
  below; 
  

   much 
  crystalline 
  calcite 
  replacing 
  poorly 
  preserved 
  fossils 
  

   8" 
  Blue 
  black, 
  finely 
  granular, 
  dove 
  limestone 
  ; 
  calcite 
  spots 
  

  

  Blue 
  gray, 
  calcareous, 
  sandy 
  shales, 
  weathering 
  yellowish 
  

   Dark 
  blue, 
  finely 
  crystalline 
  limestone; 
  conglomeratic 
  

   Blue 
  gray, 
  calcareous 
  shales, 
  weathering 
  yellowish; 
  sand 
  grains 
  

   Blue 
  dove 
  limestone 
  ; 
  base 
  weathering 
  sandy 
  looking 
  

   Sandy, 
  argillaceous, 
  shaly 
  limestone, 
  weathering 
  yellowish 
  

   Blue 
  dove, 
  mottled 
  limestone 
  

  

  Gray 
  blue, 
  dove 
  limestone, 
  som.ewhat 
  muddy, 
  shaly 
  fracture 
  

   Blue 
  dove 
  limestone, 
  small 
  limestone 
  pebbles 
  

  

  Solid 
  layer 
  of 
  blue 
  dove 
  limestone, 
  rudely 
  laminated 
  with 
  or- 
  

   ganic 
  streaks 
  

   Laminated, 
  argillaceous, 
  fine 
  grained, 
  mottled, 
  blue 
  dove 
  lime- 
  

   stone; 
  two 
  seams 
  _ 
  

   Fine, 
  flinty, 
  dove 
  limestone; 
  slightly 
  conglomeratic 
  at 
  base 
  

   i' 
  10" 
  Fine, 
  flinty, 
  dove 
  limestone, 
  with 
  a 
  shaly 
  streak 
  of 
  3"; 
  lower 
  

  

  portion 
  with 
  Phytopsis 
  

   4' 
  Rather 
  compact, 
  fine 
  dove 
  limestone; 
  a 
  little 
  Phytopsis 
  in 
  the 
  

  

  upper 
  3" 
  

   i' 
  2" 
  Blue 
  dove, 
  thin 
  and 
  irregular 
  bedded 
  limestone 
  

   2' 
  6" 
  Measures 
  concealed 
  

  

  5" 
  Blue 
  dove, 
  mottled, 
  laminated 
  limestone, 
  small 
  ostracods 
  

  

  I 
  

  

  10 
  

  

  

  1" 
  

  

  

  8" 
  

  

  3' 
  

  

  9:: 
  

   ?" 
  

  

  l' 
  

  

  7" 
  

   9" 
  

  

  l' 
  

  

  10" 
  

  

  l' 
  

  

  4" 
  

  

  45' 
  5" 
  Of 
  which 
  the 
  lower 
  41' 
  8" 
  belongs 
  to 
  the 
  Pamelia 
  

  

  The 
  I 
  foot 
  layer, 
  third 
  from 
  the 
  top 
  of 
  the 
  section, 
  is 
  divisible 
  into 
  

   an 
  upper 
  3 
  inch 
  portion, 
  full 
  of 
  fossils, 
  making 
  an 
  irregular 
  contact 
  

   with 
  the 
  remainder, 
  which 
  lacks 
  fossils, 
  and 
  in 
  Ulrich's 
  judgment, 
  

   with 
  which 
  we 
  coincide, 
  the 
  line 
  between 
  the 
  two 
  formations 
  is 
  

   properly 
  drawn 
  at 
  that 
  slight 
  break. 
  These 
  upper 
  dove 
  limestone 
  

   layers, 
  over 
  40 
  feet 
  thick 
  in 
  this 
  section, 
  have 
  puzzled 
  us 
  much 
  and 
  

   have 
  been 
  difficult 
  to 
  classify. 
  They 
  are 
  above 
  the 
  white, 
  earthy 
  

   beds 
  which 
  are 
  the 
  most 
  characteristic 
  lithologic 
  feature 
  of 
  the 
  

   upper 
  Pamelia, 
  and 
  while 
  they 
  are 
  precisely 
  like 
  the 
  dove 
  limestones 
  

  

  