﻿20 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  Niagara 
  river. 
  The 
  Clinton 
  strata 
  are 
  exposed 
  within 
  the 
  

   Niagara 
  gorge 
  all 
  the 
  way 
  from 
  the 
  falls 
  to 
  Lewiston 
  at 
  the 
  north 
  

   end. 
  They 
  are 
  overlain 
  by 
  70 
  feet 
  of 
  Rochester 
  shale 
  and 
  rest 
  upon 
  

   the 
  " 
  gray 
  band 
  " 
  that 
  forms 
  the 
  uppermost 
  layer 
  of 
  the 
  Medina. 
  1 
  

   Their 
  aggregate 
  thickness 
  is 
  32 
  feet. 
  

  

  STRATA 
  FEET 
  

  

  Bluish 
  gray 
  limestone, 
  somewhat 
  crystalline, 
  fossiliferous. 
  12 
  

   Compact 
  limestone, 
  few 
  fossils, 
  carries 
  iron 
  pyrite 
  in 
  

   lower 
  portion, 
  the 
  only 
  semblance 
  of 
  the 
  iron 
  ore 
  seams 
  

  

  farther 
  east 
  14 
  

  

  Bright 
  green 
  and 
  olive 
  shale 
  6 
  

  

  Rochester. 
  Between 
  Niagara 
  river 
  and 
  Rochester, 
  a 
  distance 
  

   of 
  75 
  miles, 
  no 
  complete 
  sections 
  of 
  the 
  Clinton 
  are 
  available. 
  At 
  

   Rochester 
  the 
  Genesee 
  river 
  cuts 
  through 
  the 
  entire 
  formation, 
  af- 
  

   fording 
  one 
  of 
  the 
  best 
  exposures 
  along 
  the 
  entire 
  belt. 
  

  

  STRATA 
  FEET 
  

  

  Bluish 
  gray 
  limestone 
  (Irondequoit), 
  crystalline, 
  abun- 
  

   dant 
  fossils 
  in 
  certain 
  parts 
  18 
  

  

  Green 
  shale 
  (Williamson) 
  with 
  dark 
  bands 
  containing 
  

   graptolites 
  and 
  pearly 
  bands 
  near 
  top 
  with 
  A 
  n 
  o 
  p 
  1 
  o 
  - 
  

   theca 
  hemispherica.. 
  24 
  

  

  Hard 
  limestone 
  (Wolcott), 
  silicious, 
  holding 
  Pentam- 
  

   erus 
  oblongus, 
  commonly 
  known 
  as 
  Pentam- 
  

   erus 
  limestone 
  14 
  

  

  Iron 
  ore 
  (Furnaceville), 
  fossil 
  hematite 
  14 
  in. 
  

  

  Green 
  shale 
  (Sodus), 
  few 
  fossils 
  24 
  

  

  The 
  formation 
  is 
  here 
  81 
  feet 
  thick, 
  a 
  gain 
  of 
  49 
  feet 
  over 
  the 
  

   thickness 
  shown 
  at 
  Niagara 
  Falls, 
  mostly 
  represented 
  in 
  the 
  shale 
  

   members 
  [see 
  pi. 
  2]. 
  

  

  Ontario, 
  Wayne 
  co. 
  From 
  the 
  mine 
  workings 
  and 
  drill 
  holes 
  

   near 
  Ontario, 
  15 
  miles 
  northeast 
  of 
  Rochester, 
  the 
  following 
  suc- 
  

   cession 
  has 
  been 
  established 
  for 
  the 
  lower 
  members 
  of 
  the 
  for- 
  

   mation. 
  

  

  STRATA 
  FEET 
  

  

  Soil 
  and 
  gravel 
  io± 
  

  

  Shale 
  (Williamson) 
  grading 
  into 
  limestone 
  below 
  2 
  

  

  x 
  For 
  fuller 
  description 
  of 
  the 
  Niagara 
  Falls 
  section, 
  Grabau, 
  N. 
  Y. 
  State 
  Mus. 
  

  

  Bui. 
  45- 
  1901. 
  

  

  