﻿E. 
  M. 
  Kindle 
  — 
  Age 
  of 
  the 
  Eurypterids 
  of 
  Kokom,o. 
  287 
  

  

  Whatever 
  inferences 
  regarding 
  the 
  age 
  of 
  the 
  Kokomo 
  

   fauna 
  might 
  have 
  been 
  drawn 
  from 
  the 
  two 
  or 
  three 
  species 
  

   originally 
  ascribed 
  to 
  it 
  in 
  the 
  Indiana 
  Reports, 
  the 
  fauna 
  at 
  

   present 
  known 
  affords 
  no 
  satisfactory 
  ground 
  for 
  correlating 
  it 
  

   with 
  the 
  Noblesville 
  dolomite 
  of 
  Indiana 
  or 
  the 
  Lockport 
  of 
  

   New 
  York. 
  So 
  unlike 
  are 
  the 
  characteristic 
  features 
  of 
  each 
  

   that 
  no 
  geologist 
  with 
  a 
  knowledge 
  of 
  the 
  Noblesville 
  and 
  

   Kokomo 
  faunas 
  derived 
  from 
  a 
  field 
  study 
  of 
  the 
  beds 
  holding 
  

   them 
  would 
  ever 
  be 
  likely 
  to 
  think 
  of 
  the 
  possibility 
  of 
  the 
  

   identity 
  of 
  the 
  two. 
  Trilobites 
  constitute 
  one 
  of 
  the 
  impor- 
  

   tant 
  and 
  almost 
  invariably 
  present 
  elements 
  of 
  the 
  Nobles- 
  

   ville 
  faunules 
  which 
  is 
  entirely 
  absent 
  from 
  the 
  Kokomo 
  fauna. 
  

   Scarcely 
  a 
  faunule 
  has 
  been 
  collected 
  from 
  the 
  Noblesville 
  by 
  

   the 
  writer 
  which 
  did 
  not 
  include 
  Sphaerexochus 
  romingeri 
  or 
  

   some 
  other 
  species 
  of 
  lllaenus. 
  The 
  entire 
  absence 
  from 
  the 
  

   Kokomo 
  limestone 
  of 
  gasteropods, 
  which 
  are 
  common 
  both 
  in 
  

   the 
  Noblesville 
  and 
  Huntington 
  formations, 
  serves 
  also 
  to 
  em- 
  

   phasize 
  the 
  difference 
  between 
  the 
  two. 
  

  

  Since 
  a 
  comparison 
  of 
  the 
  faunas 
  does 
  not 
  appear 
  to 
  justify 
  

   the 
  correlation 
  of 
  the 
  Kokomo 
  with 
  the 
  Nobles 
  ville 
  we 
  may 
  

   next 
  inquire 
  briefly 
  what 
  correlation 
  the 
  fauna 
  does 
  suggest. 
  

   The 
  only 
  plants 
  which 
  are 
  known 
  from 
  the 
  Kokomo 
  limestone 
  

   were 
  described 
  by 
  David 
  White 
  from 
  specimens 
  transmitted 
  

   by 
  the 
  writer. 
  Concerning 
  the 
  relationship 
  of 
  the 
  two 
  new 
  

   species 
  of 
  Buthotrepfiis 
  w 
  T 
  hich 
  Mr. 
  White 
  recognized 
  in 
  these, 
  

   he 
  states, 
  " 
  Of 
  all 
  the 
  species 
  as 
  yet 
  ascribed 
  to 
  this 
  genus 
  that 
  

   w 
  T 
  hich 
  seems 
  to 
  be 
  most 
  closely 
  related 
  to 
  the 
  fossils 
  in 
  hand 
  is 
  

   BiUhotrephis 
  lesquereuxii 
  described 
  by 
  Grote 
  and 
  Pitt 
  from 
  

   the 
  Waterlime 
  (Cobleskill) 
  near 
  Buffalo, 
  1ST. 
  Y."* 
  White 
  cor- 
  

   related 
  the 
  beds 
  which 
  furnished 
  these 
  plants 
  with 
  the 
  u 
  Kound- 
  

   out 
  of 
  Schuchert 
  and 
  Clarke.f 
  (Cobleskill 
  of 
  the 
  present 
  

   N. 
  Y. 
  State 
  Survey 
  nomenclature.) 
  

  

  The 
  species 
  which 
  Foerste 
  has 
  reported 
  from 
  the 
  Kokomo 
  

   limestone 
  include 
  one 
  characteristic 
  species 
  of 
  the 
  Cobleskill 
  

   dolomite 
  of 
  New 
  York, 
  Spirifer 
  corallinensis 
  Grabau, 
  together 
  

   with 
  several 
  which 
  have 
  their 
  nearest 
  allies 
  in 
  Salina 
  or 
  Cobles- 
  

   kill 
  species. 
  One 
  of 
  the 
  ostracods 
  Foerste 
  finds 
  closely 
  

   related 
  to 
  Jsochilina 
  grand 
  Is 
  latimarginata, 
  a 
  species 
  which 
  

   in 
  Manitoba 
  occurs 
  above 
  the 
  gypsum 
  beds 
  which 
  are 
  believed 
  

   to 
  be 
  of 
  Salina 
  age. 
  The 
  other 
  ostracod 
  in 
  the 
  Kokomo 
  

   fauna 
  Foerste 
  finds 
  closely 
  related 
  to 
  a 
  Decker 
  Ferry 
  species. 
  

   Foerste's 
  study 
  of 
  the 
  fauna 
  leads 
  him 
  to 
  conclude 
  that 
  the 
  

   Eurypterid 
  horizon 
  and 
  probably 
  the 
  brachiopod 
  horizon 
  are 
  

   of 
  Salina 
  age.J 
  

  

  The 
  absolute 
  unlikeness 
  of 
  the 
  Kokomo 
  fauna 
  and 
  the 
  faunas 
  

   of 
  the 
  closely 
  adjacent 
  exposures 
  of 
  the 
  Noblesville 
  and 
  Hunt- 
  

  

  *Proc. 
  U. 
  S. 
  Natl. 
  Mus., 
  vol. 
  xxiv, 
  p. 
  267, 
  1905. 
  flbid., 
  p. 
  265. 
  

   % 
  Jour. 
  Cm. 
  Soc. 
  Nat. 
  Hist., 
  vol. 
  xxi, 
  p. 
  6, 
  1909. 
  

  

  