﻿136 
  K. 
  F. 
  Mather 
  — 
  Pottsville 
  Formations 
  and 
  Faunas. 
  

  

  with 
  the 
  remains 
  of 
  marine 
  organisms. 
  These 
  are 
  known 
  to 
  

   outcrop 
  near 
  Clarita, 
  Oklahoma, 
  in 
  the 
  northwest 
  corner 
  of 
  the 
  

   Atoka 
  quadrangle. 
  The 
  fossiliferous 
  strata 
  were 
  discovered 
  

   by 
  Dr. 
  L. 
  C. 
  Snider, 
  formerly 
  Assistant 
  Director 
  of 
  the 
  Okla- 
  

   homa 
  Geological 
  Survey, 
  and 
  to 
  him 
  I 
  am 
  indebted 
  for 
  the 
  

   opportunity 
  of 
  studying 
  their 
  fauna. 
  

  

  The 
  fossils 
  are 
  preserved 
  entirely 
  as 
  casts 
  and 
  moulds 
  in 
  the 
  

   weathered 
  portion 
  of 
  the 
  outcropping 
  beds 
  from 
  which 
  all 
  cal- 
  

   careous 
  material 
  has 
  been 
  leached. 
  The 
  individual 
  specimens 
  

   are 
  indiscriminately 
  intermingled 
  and 
  many 
  were 
  broken 
  

   before 
  fossilization 
  took 
  place. 
  It 
  is 
  quite 
  clear 
  that 
  most 
  of 
  

   the 
  shells 
  were 
  transported 
  by 
  waves 
  and 
  currents 
  until 
  they 
  

   collected 
  in 
  quiet 
  water, 
  where 
  they 
  were 
  buried 
  beneath 
  sandy 
  

   sediments. 
  

  

  'No 
  less 
  than 
  forty-two 
  identifiable 
  forms 
  have 
  come 
  to 
  hand 
  

   from 
  the 
  one 
  locality. 
  These 
  are 
  listed 
  below. 
  

  

  Campophyllum 
  torquium 
  (Owen) 
  

  

  Rbombopora 
  sp. 
  

  

  Prismopora 
  concava 
  Mather 
  

  

  Chonetes 
  choteauensis 
  Mather 
  

  

  Chonetes 
  lsevis 
  Keyes 
  

  

  Productus 
  fayettevillensis 
  Mather 
  

  

  Productus 
  gallatinensis 
  Girty 
  ? 
  

  

  Spirifer 
  rockymontanus 
  Marcou 
  

  

  Squamularia 
  perplexa 
  (McOhesney) 
  

  

  Composita 
  wasatchensis 
  (White) 
  

  

  Nucula 
  parva 
  McChesney 
  

  

  Yoldia 
  glabra 
  Beede 
  and 
  Rogers 
  ? 
  

  

  Parallelodon 
  pergibbosus 
  Mather 
  

  

  Caneyella 
  ? 
  n. 
  sp. 
  

  

  Pseudomonotis 
  precursor 
  Mather 
  

  

  Myalina 
  cuneiformis 
  Gurley 
  ? 
  

  

  Myalina 
  orthonota 
  Mather 
  

  

  Schizodus 
  affinis 
  Herri 
  ck 
  

  

  Schizodus 
  wheeleri 
  (Swallow) 
  ? 
  

  

  Schizodus 
  telliniforniis 
  Girty 
  

  

  Deltopecten 
  occidentalis 
  (Shumard) 
  

  

  Aviculopecten 
  arkansanus 
  Mather 
  

  

  Plagiostoma? 
  acosta 
  Cox 
  

  

  Pleurophorus 
  subcostatus 
  Meek 
  and 
  Worthen 
  ? 
  

  

  Pleurophorus 
  n. 
  sp. 
  

  

  Pleurophorus 
  sp. 
  

  

  Astartella 
  n. 
  sp. 
  

  

  Euphemus 
  carbonarius 
  (Cox) 
  

  

  Worthenia 
  tabulata 
  (Conrad) 
  

  

  Orestes 
  sp. 
  

  

  Euconospira 
  turbiniforrais 
  (Meek 
  and 
  Worthen) 
  

  

  Strophostylus 
  remex 
  (White) 
  

  

  Platyceras 
  parvum 
  (Swallow) 
  

  

  