﻿90 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  Leray 
  limestone 
  and 
  reaches 
  to 
  the 
  base 
  of 
  the 
  Trenton. 
  The 
  con- 
  

   tact 
  with 
  the 
  typical 
  Lowville 
  beds 
  is 
  shown 
  on 
  the 
  opposite 
  side 
  of 
  

   the 
  river 
  and 
  on 
  Diamond 
  island. 
  Plate 
  24 
  shows 
  a 
  part 
  of 
  the 
  

   quarr}\ 
  

  

  Section 
  at 
  Klock's 
  quarry, 
  Watertown 
  

  

  iH'-2' 
  Black, 
  knotty, 
  impure, 
  dark 
  limestone 
  with 
  Strophomena 
  

   filitexta, 
  Leperditia 
  fabulites, 
  Orthis 
  per- 
  

   vetus, 
  Isotelus 
  platycephalus, 
  Orthis 
  tri- 
  

   cenaria, 
  Illaenus 
  americanus, 
  etc. 
  

  

  / 
  7 
  foot 
  tier. 
  Heavj^ 
  black 
  limestone, 
  with 
  Gonioceras 
  

  

  anceps, 
  Hormoceras 
  tenuifilum 
  

  

  6' 
  Dark 
  gray 
  to 
  black, 
  heavily 
  bedded, 
  cross-striated 
  limestone 
  with 
  

  

  a 
  few 
  cherts, 
  containing 
  also 
  Endcceras, 
  Gonioceras. 
  Resting 
  on 
  

   an 
  irregular 
  surface; 
  base 
  of 
  Watertown 
  limestone 
  

  

  z'-a^'* 
  Irregularly 
  bedded, 
  dark 
  to 
  black, 
  dove 
  colored, 
  fine 
  grained 
  lime- 
  

   stone, 
  characterized 
  by 
  weathered, 
  fucoid, 
  earthy 
  markings 
  

  

  S'-f- 
  Fine 
  grained 
  dark 
  gray 
  limestone, 
  with 
  cherty 
  layer 
  on 
  top. 
  Cherty 
  

  

  beds. 
  Bottom 
  not 
  shown 
  

  

  These 
  chert 
  beds 
  are 
  in 
  this 
  neighborhood 
  underlain 
  by 
  4-5 
  feet 
  of 
  

   fine 
  grained 
  dark 
  gray 
  beds 
  with 
  Tetradium 
  cellulosum, 
  

   which 
  also 
  weather 
  block}^ 
  like 
  the 
  Watertown 
  limestone. 
  Below 
  

   this 
  are 
  found 
  the 
  dove 
  colored, 
  thinner 
  bedded, 
  typical 
  Tetradium 
  

   beds. 
  

  

  A 
  series 
  of 
  good 
  sections 
  of 
  the 
  Watertown-Leray 
  limestone 
  are 
  

   exposed 
  in 
  the 
  large 
  quarries 
  about 
  Chaumont 
  Since, 
  however, 
  the 
  

   Seven 
  foot 
  tier 
  forms 
  here 
  the 
  top 
  of 
  the 
  section 
  and 
  an 
  tmknown 
  

   thickness 
  of 
  the 
  same 
  is 
  always 
  eroded, 
  the 
  thicknesses 
  obtained 
  are 
  

   always 
  a 
  minimum. 
  In 
  the 
  large 
  quarries 
  at 
  the 
  head 
  of 
  Chau- 
  

   mont 
  bay 
  the 
  combined 
  beds 
  measure 
  18 
  feet; 
  in 
  the 
  big 
  quarries 
  

   along 
  Chaumont 
  river 
  19 
  feet 
  of 
  these 
  limestones 
  are 
  found, 
  below 
  

   which 
  22. 
  feet 
  of 
  tv'pical 
  Low^'ille 
  beds 
  are 
  exposed 
  to 
  the 
  river 
  edge. 
  

  

  Trenton 
  limestone. 
  The 
  last 
  of 
  the 
  Lower 
  Siluric 
  stages 
  oc- 
  

   curring 
  in 
  the 
  area 
  of 
  the 
  map 
  is 
  the 
  Trenton 
  limestone. 
  It 
  ap- 
  

   pears 
  first 
  in 
  outliers 
  near 
  the 
  mouth 
  of 
  Black 
  river, 
  then 
  occupies 
  

   the 
  southern 
  portions 
  of 
  the 
  peninsulas 
  jutting 
  out 
  into 
  Lake 
  On- 
  

   tario 
  and 
  finally 
  on 
  the 
  Cape 
  Vincent 
  sheet 
  forms 
  a 
  continuous 
  

   belt. 
  In 
  contrast 
  to 
  the 
  underlying 
  formations 
  and 
  notably 
  its 
  direct 
  

   predecessor, 
  the 
  Watertown 
  limestone, 
  which 
  forms 
  a 
  remarkably 
  

   level 
  plateau 
  with 
  a 
  distinct 
  escarpment 
  at 
  the 
  northern 
  boundary, 
  

   the 
  Trenton 
  appears 
  in 
  well 
  rounded 
  hills, 
  its 
  boundaries 
  approach 
  

   subcircular 
  curves, 
  in 
  contrast 
  to 
  the 
  many 
  fingered 
  and 
  deeply 
  in- 
  

   dented 
  Watertown 
  exposures. 
  This 
  is 
  due 
  to 
  the 
  fact 
  that 
  the 
  

   Trenton 
  is 
  a 
  much 
  thicker 
  and 
  at 
  the 
  same 
  time 
  a 
  much 
  less 
  re- 
  

   sistant 
  formation, 
  consisting 
  ahnost 
  entirely 
  of 
  thin 
  bedded 
  lime- 
  

   stones 
  with 
  shaly 
  intercalations. 
  It 
  is 
  therefore 
  also 
  much 
  more 
  

   covered 
  by 
  drift 
  and 
  as 
  a 
  rule 
  exposed 
  only 
  along 
  the 
  shore 
  line 
  or 
  

  

  