﻿Report 
  of 
  the 
  State 
  Geologist. 
  349 
  

  

  "No 
  evidence 
  is 
  afforded 
  by 
  the 
  Livonia 
  section 
  as 
  to 
  the 
  horizon 
  

   of 
  the 
  Eurypterus 
  and 
  Plerygotus 
  beds. 
  This, 
  of 
  itself, 
  is 
  a 
  nega- 
  

   tive 
  fact 
  of 
  interest, 
  showing 
  an 
  absence 
  or 
  sparsity 
  of 
  these 
  

   crustaceans 
  through 
  this 
  west-central 
  region 
  of 
  the 
  State, 
  which 
  

   is 
  confirmed 
  by 
  outcrops 
  of 
  adjoining 
  counties 
  ; 
  while 
  they 
  

   abound 
  to 
  the 
  westward, 
  in 
  Erie 
  county, 
  and 
  to 
  the 
  east, 
  in 
  

   Oneida 
  and 
  Herkimer 
  counties. 
  Mr. 
  Luther 
  reports 
  the 
  finding 
  

   of 
  a 
  specimen 
  of 
  Eurypterus 
  in 
  an 
  outcrop 
  near 
  Phelps, 
  Ontario 
  

   county, 
  which, 
  without 
  precise 
  measurement, 
  he 
  thinks 
  represents 
  

   an 
  horizon 
  not 
  more 
  than 
  twenty 
  feet 
  below 
  the 
  base 
  of 
  the 
  

   Oriskany 
  sandstone 
  at 
  that 
  place 
  ; 
  and 
  Prof. 
  Williams, 
  in 
  the 
  

   paper 
  cited, 
  mentions 
  a 
  fragment 
  of 
  Pterygoids 
  in 
  association 
  

   with 
  the 
  other 
  fossils 
  noted. 
  This 
  evidence, 
  however, 
  is 
  insuffi- 
  

   cient 
  to 
  justify 
  the 
  assumption 
  that 
  the 
  Eurypterus 
  fauna 
  is 
  an 
  

   integral 
  part 
  of 
  that 
  of 
  the 
  Tentaculite 
  limestone, 
  or 
  to 
  disturb 
  

   the 
  conviction 
  that 
  this 
  crustacean 
  in 
  its 
  full 
  development 
  char- 
  

   acterizes 
  the 
  closing 
  part 
  of 
  the 
  Waterlime 
  group. 
  As 
  shown 
  

   by 
  Prof. 
  Hall,* 
  the 
  Eurypterus 
  beds 
  in 
  Oneida 
  county, 
  where 
  

   exposed 
  in 
  conjunction 
  with 
  the 
  Tentaculite 
  limestone, 
  are 
  clearly 
  

   seen 
  to 
  pass 
  beneath 
  the 
  latter, 
  and 
  where 
  the 
  former 
  are 
  so 
  pro- 
  

   lific 
  in 
  life, 
  to 
  the 
  west 
  in 
  Erie 
  county, 
  the 
  Tentaculite 
  limestone 
  

   is 
  wanting. 
  

  

  The 
  stratum 
  at 
  1,001 
  feet, 
  with 
  its 
  fauna, 
  constitutes 
  one 
  of 
  

   the 
  most 
  interesting 
  features 
  of 
  this 
  section. 
  It 
  is 
  a 
  con- 
  

   glomerate 
  of 
  blocks 
  of 
  hydraulic 
  limestone 
  cemented 
  by 
  a 
  paste 
  

   of 
  silicious 
  sand. 
  The 
  hydraulic 
  blocks 
  have 
  evidently 
  been 
  

   derived 
  from 
  the 
  strata 
  beneath, 
  but 
  they 
  have 
  furnished 
  no 
  

   fossils, 
  all 
  traces 
  of 
  organic 
  life 
  having 
  been 
  obtained 
  from 
  the 
  

   sandy 
  cement. 
  These 
  fossils 
  are 
  not 
  well 
  preserved 
  and 
  show 
  evi- 
  

   dence 
  of 
  having 
  been 
  tossed 
  about 
  by 
  the 
  waves, 
  broken 
  and 
  

   macerated. 
  The 
  most 
  frequently 
  occurring 
  species 
  is 
  a 
  very 
  

   variable 
  form 
  of 
  Pentamerella 
  not 
  unlike 
  P. 
  ourata 
  when 
  the 
  sur- 
  

   face 
  of 
  the 
  valves 
  is 
  plicated, 
  but 
  very 
  unlike 
  that 
  species 
  when 
  

   its 
  surface 
  is 
  (naturally, 
  not 
  accidentally) 
  devoid 
  of 
  plication. 
  

   While 
  it 
  is 
  natural 
  to 
  regard 
  this 
  sandstone 
  formation 
  as 
  a 
  west- 
  

   ward 
  extension 
  of 
  the 
  Oriskany, 
  this 
  conclusion 
  is 
  not 
  fully 
  

   justified. 
  Among 
  the 
  identifiable 
  fossils 
  there 
  is 
  no 
  single 
  char- 
  

  

  * 
  Palaeontology 
  of 
  New 
  York, 
  vol. 
  3, 
  p. 
  385, 
  1859. 
  

  

  