﻿284: 
  E. 
  M. 
  Kindle 
  — 
  Age 
  of 
  the 
  Eurypterids 
  of 
  Kokomo. 
  

  

  been 
  found 
  in 
  this 
  bed 
  so 
  far 
  as 
  known. 
  The 
  eurypterids 
  

   occur 
  in 
  bed 
  number 
  two 
  and 
  probably 
  in 
  various 
  other 
  beds 
  

   below 
  it. 
  Most 
  of 
  the 
  beds 
  and 
  probably 
  all 
  of 
  them 
  below 
  

   number 
  one 
  contain 
  a 
  notable 
  amount 
  of 
  magnesia. 
  

  

  The 
  most 
  prominent 
  general 
  characteristic 
  of 
  the 
  lithology 
  

   of 
  these 
  beds 
  is 
  the 
  very 
  even 
  bedding 
  and 
  generally 
  thin 
  

   lamination. 
  This 
  strikingly 
  developed 
  feature 
  distinguishes 
  

   the 
  Kokomo 
  limestone 
  sharply 
  from 
  any 
  of 
  the 
  known 
  types 
  of 
  

   the 
  Noblesville 
  dolomite. 
  The 
  latter 
  never 
  shows 
  thin 
  lamina- 
  

   tion 
  or 
  marked 
  evenness 
  of 
  bedding. 
  Frequently 
  the 
  bedding 
  

   planes 
  of 
  the 
  Noblesville 
  are 
  so 
  obscure 
  as 
  to 
  make 
  their 
  recog- 
  

   nition 
  difficult. 
  When 
  they 
  are 
  well 
  marked 
  the 
  distinct, 
  clear 
  

   cut, 
  horizontal, 
  and 
  even 
  lamination 
  of 
  the 
  Kokomo 
  beds 
  is 
  

   never 
  present. 
  Sometimes, 
  as 
  in 
  the 
  case 
  of 
  outcrops 
  on 
  the 
  

   Wabash 
  river 
  below 
  Peru, 
  the 
  irregularity 
  of 
  bedding 
  takes 
  the 
  

   form 
  of 
  cross 
  bedding. 
  The 
  well 
  marked 
  physical 
  peculiari- 
  

   ties 
  which 
  distinguish 
  the 
  Kokomo 
  limestone 
  from 
  the 
  Nobles- 
  

   ville 
  dolomite 
  are 
  so 
  pronounced 
  that 
  there 
  is 
  no 
  good 
  reason 
  

   for 
  confusing 
  the 
  two 
  by 
  using 
  such 
  a 
  term 
  as 
  " 
  ISoblesville 
  

   waterlirue."* 
  

  

  A 
  geologist 
  familiar 
  with 
  the 
  sharp 
  contrasts 
  shown 
  by 
  the 
  

   lithology 
  of 
  the 
  Kokomo 
  and 
  the 
  Noblesville 
  formations 
  would 
  

   indeed 
  be 
  surprised 
  if 
  he 
  found 
  the 
  same 
  fauna 
  in 
  each. 
  But 
  

   the 
  faunas 
  and 
  the 
  lithology 
  are 
  quite 
  harmonious 
  in 
  indicating 
  

   that 
  the 
  Kokomo 
  and 
  Noblesville 
  represent 
  entirely 
  distinct 
  

   formations. 
  The 
  evidence 
  of 
  the 
  fossils 
  can 
  best 
  be 
  shown 
  by 
  

   presenting 
  a 
  list 
  of 
  the 
  species 
  collected 
  by 
  the 
  writer 
  at 
  the 
  

   type 
  locality 
  of 
  the 
  Noblesville 
  dolomite 
  for 
  comparison 
  with 
  

   the 
  fauna 
  of 
  the 
  Kokomo 
  limestone. 
  

  

  Noblesmlle 
  dolomite 
  fossils 
  from 
  Connors 
  Mill, 
  Hamilton 
  

   County, 
  Indiana. 
  

  

  Strophonella 
  cf. 
  striata 
  Hall. 
  

  

  Strophonella 
  williamsi 
  Kindle. 
  

  

  Leptaena 
  rhomboidalis 
  Wilckens. 
  

  

  Plectdmbonitea 
  cf. 
  sericeus 
  Sowerby. 
  

  

  Dalmanella 
  elegantula 
  Dalman. 
  

  

  JRhipidomella 
  hybrida 
  Sowerby. 
  

  

  Conchidium 
  cf. 
  midticostatum 
  Hall. 
  

  

  Atrypa 
  calvini 
  Nettleroth. 
  

  

  Atrypa 
  reticularis 
  Linnaeus. 
  

  

  Spirifer 
  nobilis 
  Barrande. 
  

  

  Spirifer 
  radiaius 
  Sowerby. 
  

  

  ISpirifer 
  (Reticularia) 
  crispa 
  var. 
  simplex 
  Hall. 
  

  

  Meristina 
  maria 
  Hall. 
  

  

  Platyceras 
  (Diaphrostoma) 
  cornutum 
  Hisinger. 
  

  

  * 
  Mem. 
  N. 
  Y. 
  State 
  Museum, 
  No. 
  14, 
  p. 
  215, 
  1912. 
  

  

  