﻿26 
  ■ 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  According 
  to 
  the 
  work 
  of 
  Gushing 
  and 
  Ulrich 
  farther 
  northward, 
  

   there 
  is 
  an 
  unconformity 
  separating 
  the 
  two 
  formations, 
  the 
  

   time 
  gap 
  being 
  represented 
  by 
  the 
  upper 
  portion 
  of 
  the 
  Chazy 
  

   of 
  the 
  Champlain 
  valley. 
  In 
  the 
  Port 
  Leyden 
  district, 
  the 
  change 
  

   from 
  the 
  conglomeratic 
  bluish 
  dove 
  limestones 
  to 
  the 
  more 
  im- 
  

   pure 
  whitish, 
  sandy 
  beds 
  seems 
  significant 
  and 
  may 
  be 
  due 
  to 
  

   an 
  unconformity 
  at 
  this 
  horizon. 
  Certainly, 
  however, 
  the 
  writer 
  

   has 
  found 
  no 
  evidence 
  of 
  any 
  well 
  defined 
  or 
  large 
  unconformity 
  

   between 
  the 
  Lowville 
  and 
  Pamelia. 
  

  

  In 
  the 
  Roaring 
  brook 
  section 
  as 
  measured 
  by 
  Gushing 
  the 
  

   Lowville 
  is 
  made 
  up 
  as 
  follows 
  : 
  

  

  Feet 
  Inches 
  

   6-foot 
  layer 
  of 
  Black 
  River 
  limestone; 
  upper 
  3 
  feet 
  full 
  of 
  

  

  chert 
  

  

  Mostly 
  thin 
  bedded 
  blue 
  dove 
  limestone 
  in 
  6-inch 
  to 
  i-foot 
  

   layers, 
  full 
  of 
  Tetradium 
  and 
  other 
  fossils, 
  to 
  base 
  of 
  Black 
  

  

  River 
  7 
  8 
  

  

  Massive 
  beds 
  of 
  blue 
  dove 
  limestone 
  in 
  18-inch 
  to 
  2-foot 
  

   layers; 
  only 
  sparingly 
  fossiliferous, 
  but 
  more 
  or 
  less 
  Tetra- 
  

   dium 
  everywhere 
  17 
  4 
  

  

  Shaly, 
  blue 
  dove 
  limestone 
  i 
  8 
  

  

  Blue, 
  granular 
  limestone 
  full 
  of 
  fossils 
  and 
  much 
  crystallized 
  

  

  calcite 
  i 
  2 
  

  

  Ordinary 
  blue 
  dove 
  limestone; 
  lower 
  portion 
  full 
  of 
  gastro- 
  

   pods 
  ; 
  upper 
  portion 
  a 
  limestone 
  conglomerate 
  with 
  bunchy 
  

   surface 
  and 
  Stromatocerium 
  look; 
  filling 
  in 
  above 
  are 
  2-10 
  

  

  inches 
  of 
  shaly 
  limestone 
  2 
  10 
  

  

  Thin 
  bedded 
  blue 
  dove 
  limestone 
  i 
  i 
  

  

  Massive 
  blue 
  dove 
  limestone; 
  few 
  fossils 
  and 
  little 
  calcite 
  2 
  

  

  Blue 
  black 
  dove 
  limestone 
  ; 
  full 
  of 
  fossils 
  and 
  crystallized 
  cal- 
  

   cite; 
  thin 
  bedded; 
  shaly 
  above 
  i 
  5 
  

  

  Gray, 
  oolitic 
  beds 
  2 
  2 
  

  

  Shaly, 
  impure 
  limestone 
  beds 
  blue 
  dove 
  color 
  i 
  4 
  

  

  Gray 
  blue, 
  subgranular 
  limestone; 
  calcite 
  specks 
  and 
  spots.. 
  i 
  4 
  

  

  Massive, 
  blue 
  dove 
  limestone; 
  very 
  fossiliferous; 
  Tetradium 
  

  

  abundant 
  2 
  10 
  

  

  Thin 
  bedded 
  to 
  shaly 
  blue 
  dove 
  limestone; 
  mud 
  cracked; 
  

  

  many 
  fossil 
  fragments 
  3 
  6 
  

  

  Two 
  massive 
  blue 
  dove 
  beds 
  with 
  shale 
  parting; 
  conglomer- 
  

   atic; 
  many 
  fossils 
  and 
  calcite 
  spots; 
  not 
  sure 
  about 
  Tetra- 
  

   dium 
  2 
  8 
  

  

  Blue 
  black 
  dove 
  limestone, 
  notably 
  conglomeratic; 
  lots 
  of 
  fos- 
  

   sil 
  fragments 
  and 
  many 
  calcite 
  spots; 
  irregular 
  surface 
  9 
  

  

  Thin 
  bedded, 
  mud 
  cracked, 
  dove 
  limestone 
  i 
  4 
  

  

  Blue 
  dove 
  limestone 
  spotted 
  with 
  calcite 
  ; 
  conglomeratic 
  ; 
  many 
  

   fossils 
  ; 
  no 
  Tetradium 
  seen 
  ; 
  abundant 
  quartz 
  sand 
  grains 
  

   on 
  lower 
  surface 
  ; 
  probable 
  base 
  of 
  Lowville 
  3 
  6 
  

  

  Total 
  54 
  7 
  

  

  