﻿E. 
  M. 
  Kindle 
  — 
  Age 
  of 
  the 
  Eurypterids 
  of 
  Kokomo. 
  283 
  

  

  date 
  most 
  of 
  the 
  Kokomo 
  fauna 
  was 
  described 
  by 
  Dr. 
  Aug. 
  

   Foerste. 
  Now 
  that 
  both 
  the 
  Kokomo 
  and 
  Niagaran 
  faunas 
  of 
  

   northern 
  Indiana 
  have 
  been 
  described, 
  it 
  is 
  in 
  order 
  to 
  examine 
  

   the 
  evidence 
  which 
  they 
  afford 
  regarding 
  the 
  question 
  of 
  their 
  

   equivalence 
  as 
  advocated 
  by 
  Clarke 
  and 
  Ruedemann, 
  or 
  their 
  

   succession 
  as 
  believed 
  by 
  the 
  writer. 
  

  

  The 
  Kokomo 
  fauna 
  occurs 
  in 
  a 
  limestone 
  which 
  in 
  the 
  earlier 
  

   references 
  to 
  it 
  was 
  generally 
  called 
  the 
  " 
  water-lime 
  " 
  beds 
  or 
  

   Water-lime 
  Group.* 
  The 
  name 
  Kokomo 
  limestone 
  was 
  intro- 
  

   duced 
  for 
  these 
  beds 
  by. 
  Foerstef 
  in 
  1904. 
  They 
  are 
  exposed 
  

   in 
  various 
  quarries 
  in 
  the 
  vicinity 
  of 
  Kokomo, 
  where 
  they 
  lie 
  

   horizontal 
  and 
  are 
  covered 
  by 
  drift 
  except 
  where 
  uncovered 
  by 
  

   quarry 
  operations. 
  The 
  character 
  of 
  the 
  beds 
  of 
  this 
  lime- 
  

   stone 
  and 
  the 
  stratigraphic 
  relations 
  of 
  the 
  eurypterid 
  and 
  non- 
  

   eurypterid 
  faunas 
  which 
  characterize 
  different 
  parts 
  of 
  them 
  

   can 
  best 
  be 
  understood 
  by 
  reference 
  to 
  a 
  section 
  of 
  one 
  of 
  the 
  

   quarries 
  in 
  the 
  Kokomo 
  limestone. 
  The 
  section 
  exposed 
  at 
  

   the 
  Geo. 
  Defenbaugh 
  quarry 
  on 
  the 
  south 
  side 
  of 
  Kokomo 
  (N. 
  

   W. 
  i 
  sec. 
  6 
  T. 
  23 
  ]tf. 
  R. 
  4E.) 
  is 
  as 
  follows 
  : 
  

  

  Section 
  of 
  Kokomo 
  limestone. 
  

  

  1. 
  Drab 
  to 
  grey 
  non-inagnesian 
  limestone, 
  with 
  chert 
  bands 
  

  

  and 
  containing 
  a 
  brachiopod 
  fauna 
  4' 
  

  

  2. 
  Thin-bedded 
  and 
  finely-laminated 
  dark-grey 
  limestone, 
  

  

  with 
  eurypterids, 
  and 
  lying 
  in 
  strata 
  l 
  // 
  -2 
  // 
  thick 
  which 
  

   on 
  weathering 
  split 
  still 
  thinner. 
  This 
  bed 
  contains 
  

   occasional 
  pockets 
  of 
  asphaltum 
  and 
  crude 
  oil 
  6' 
  

  

  3. 
  Grey 
  limestone 
  ("cement 
  rock") 
  _. 
  4' 
  

  

  4. 
  Dark-bluish 
  grey 
  argillaceous 
  limestone 
  _ 
  2' 
  

  

  5. 
  Dark 
  grey 
  limestone 
  in 
  even 
  bedded 
  ledges 
  6" 
  to 
  8" 
  thick 
  6' 
  

  

  6. 
  Very 
  hard 
  thin-bedded 
  strata 
  of 
  brownish 
  grey 
  to 
  bluish 
  

  

  limestone 
  _ 
  6' 
  

  

  V. 
  Blue 
  and 
  light 
  grey 
  banded 
  limestone, 
  the 
  layers 
  very 
  

   thin, 
  smooth, 
  and 
  even 
  bedded 
  and 
  giving 
  a 
  varie- 
  

   gated 
  appearance 
  to 
  the 
  stone 
  __ 
  4' 
  

  

  32' 
  

  

  Eight 
  or 
  ten 
  feet 
  more 
  of 
  beds 
  similar 
  to 
  those 
  of 
  the 
  section 
  

   given 
  above 
  are 
  penetrated 
  by 
  some 
  of 
  the 
  quarries 
  but 
  these 
  

   were 
  not 
  seen 
  by 
  the 
  writer. 
  As 
  in 
  the 
  water-limes 
  of 
  New 
  

   York 
  the 
  eurypterid 
  and 
  non-eurypterid 
  faunas 
  appear 
  to 
  be 
  

   confined 
  to 
  distinct 
  parts 
  of 
  the 
  section. 
  The 
  writer 
  was 
  able 
  

   to 
  discover 
  no 
  trace 
  of 
  the 
  brachiopod 
  fauna 
  which 
  character- 
  

   izes 
  bed 
  number 
  one 
  below 
  it, 
  nor 
  have 
  any 
  eurypterids 
  ever 
  

  

  *E. 
  W. 
  Claypole, 
  Am. 
  Geol. 
  vol. 
  vi, 
  p. 
  261, 
  1890. 
  A. 
  J. 
  Phinney, 
  11th 
  

   Ann. 
  Kept. 
  U. 
  S. 
  Geol. 
  Surv., 
  pt. 
  I, 
  pp. 
  632-3, 
  1891. 
  S. 
  A. 
  Miller, 
  17th 
  

   Eept. 
  Ind. 
  Dept. 
  Geol. 
  & 
  Nat. 
  Pes., 
  p. 
  33, 
  1892. 
  

  

  f 
  28th 
  Ann. 
  Kept. 
  Ind. 
  Dept. 
  Geol. 
  & 
  Nat. 
  Res. 
  p. 
  33, 
  1904. 
  

  

  Am. 
  Jour. 
  Sci.— 
  Fourth 
  Series, 
  Vol. 
  XXXVI, 
  No. 
  213.— 
  September, 
  1913. 
  

   19 
  

  

  