﻿27 
  

  

  l' 
  

  

  2 
  

  

  4" 
  

  

  6' 
  

  

  

  5' 
  

  

  

  4' 
  

  

  

  22" 
  

  

  -14'' 
  

  

  l6"- 
  

  

  -24" 
  

  

  4' 
  

  

  6" 
  

  

  3' 
  

  

  2" 
  

  

  84 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  Sanford 
  cut 
  section 
  

  

  Lowrville 
  

  

  Blue 
  gray, 
  politic 
  limestone, 
  full 
  of 
  lamellibranchs 
  and 
  with 
  

   Tetradium 
  cellulosum 
  

  

  Massive 
  Tetradium 
  beds, 
  dove 
  limestone 
  full 
  of 
  crystalline 
  calcite 
  

  

  Thin 
  bedded, 
  blocky 
  dove 
  limestone 
  ; 
  second 
  zone 
  of 
  B 
  a 
  t 
  h 
  - 
  

   yurus 
  ex 
  tans 
  

  

  Irregular, 
  thin 
  bedded, 
  blocky, 
  dove 
  limestone, 
  more 
  massive 
  above, 
  

   culminating 
  in 
  a 
  heavy, 
  irregularly 
  surfaced 
  Stromatocerium 
  

   layer 
  ; 
  holds 
  B 
  . 
  e 
  x 
  t 
  a 
  n 
  s 
  below 
  

  

  Thin 
  bedded, 
  f 
  ossilif 
  erous, 
  dove 
  limestone, 
  with 
  Camarotoe- 
  

   c 
  h 
  i 
  a 
  plena, 
  fitting 
  to 
  uneven 
  surface 
  beneath 
  

  

  Heavy, 
  massive 
  dove 
  limestone, 
  Tetradium 
  and 
  other 
  fossils, 
  

   masses 
  of 
  Stromatocerium 
  at 
  surface, 
  giving 
  bunchy 
  character 
  

  

  Speckly 
  dove 
  limestone 
  with 
  shaly 
  seams 
  ; 
  bryozoa, 
  Tetra- 
  

   dium 
  syringoporoides 
  (Ulrich, 
  _ 
  ms) 
  and 
  other 
  fossils 
  

  

  Heavy, 
  massive 
  bed 
  of 
  gray, 
  crystalline 
  limestone, 
  full 
  of 
  fossil 
  

   fragments 
  at 
  base, 
  bryozoa 
  and 
  gastropods 
  above; 
  conglomer- 
  

   atic, 
  many 
  quartz 
  grains, 
  base 
  of 
  Lowville 
  

   i' 
  6'' 
  Shaly, 
  dove, 
  mud 
  limestone, 
  three 
  beds 
  ; 
  very 
  fine, 
  even 
  grained, 
  

   cherty 
  looking 
  

  

  Leray 
  and 
  Watertown 
  limestones. 
  Emmons 
  had 
  already 
  pointed 
  

   out 
  that 
  the 
  Seven 
  foot 
  tier 
  was 
  closely 
  connected 
  by 
  its 
  lithologic 
  

   character 
  with 
  the 
  underlying 
  formation, 
  and 
  the 
  writer 
  had 
  found, 
  

   while 
  in 
  preceding 
  years 
  collecting 
  the 
  cephalopods 
  of 
  the 
  forma- 
  

   tion, 
  that 
  the- 
  characteristic 
  cephalopods 
  of 
  the 
  ''Black 
  River" 
  

   limestone 
  for 
  which 
  the 
  Watertown 
  region 
  is 
  renowned 
  among 
  

   paleontologists, 
  viz, 
  Gonioceras 
  anceps, 
  Hormoceras 
  

   tenuifilum, 
  Lituites 
  undatus 
  and 
  also 
  the 
  "Black 
  

   River 
  " 
  coral 
  Columnaria 
  ?halli 
  " 
  {—- 
  C. 
  alveolata 
  

   auct.) 
  appear 
  already 
  below 
  the 
  Seven 
  foot 
  tier,^ 
  while 
  at 
  the 
  same 
  

   time 
  the 
  characteristic 
  fossils 
  of 
  the 
  Lowville 
  cited 
  above, 
  especially 
  

   also 
  the 
  omnipresent 
  Tetradium 
  cellulosum, 
  disap- 
  

   peared. 
  Since 
  this 
  f 
  aunistic 
  extension 
  downward 
  of 
  the 
  " 
  Black 
  

   River 
  " 
  is 
  coupled 
  with 
  a 
  greater 
  lithologic 
  similarity 
  of 
  the 
  upper- 
  

   most 
  20 
  feet 
  of 
  the 
  Lowville, 
  as 
  formerly 
  conceived, 
  with 
  the 
  " 
  Black 
  

   River 
  " 
  than 
  with 
  the 
  typical 
  Lowville, 
  and 
  this 
  upper 
  portion 
  of 
  

   the 
  Lowville 
  is 
  characterized 
  by 
  seams 
  of 
  chert 
  nodules 
  which 
  

   make 
  good 
  horizon 
  markers, 
  we 
  decided 
  to 
  draw 
  the 
  Lowville-Black 
  

   River 
  line 
  where 
  Tetradium 
  cellulosum 
  abruptly 
  disap- 
  

   pears 
  and 
  the 
  chert 
  layers 
  begin. 
  In 
  mapping 
  the 
  '' 
  Black 
  River 
  " 
  on 
  

   this 
  basis, 
  it 
  was 
  found 
  that, 
  on 
  the 
  whole, 
  the 
  cherty 
  limestones 
  also 
  

   exhibit 
  the 
  characteristic 
  blocky 
  weathering 
  of 
  the 
  Watertown 
  bed, 
  

  

  1 
  While 
  these 
  cephalopods 
  first 
  appear 
  in 
  greater 
  number 
  in 
  the 
  cherty 
  

   beds 
  just 
  below 
  the 
  7 
  foot 
  tier, 
  a 
  few 
  stragglers 
  either 
  identical 
  or 
  only 
  

   prenuncial 
  mutations 
  -of 
  them, 
  have 
  already 
  been 
  noticed 
  in 
  much 
  earlier 
  

   horizons 
  of 
  the 
  Lowville. 
  Thus 
  Hormoceras 
  tenuifilum 
  

   and 
  a 
  large 
  colony 
  of 
  Columnaria 
  Phalli 
  were 
  noted 
  11 
  feet 
  below 
  

   the 
  cherty 
  beds 
  in 
  a 
  Tetradium 
  bed 
  in 
  the 
  section 
  opposite 
  the 
  filter 
  plant 
  at 
  

   Watertown. 
  

  

  