﻿Report 
  of 
  the 
  State 
  Geologist. 
  3^7 
  

  

  515 
  

  

  The 
  shales 
  become 
  softer 
  and 
  blue-grey, 
  and 
  there 
  is 
  a 
  

   gradual 
  return 
  of 
  the 
  normal 
  fauna. 
  The 
  fossils, 
  however, 
  are 
  

   still 
  massed 
  in 
  thin 
  layers 
  with 
  intervening 
  barren 
  sediments. 
  

  

  At 
  518 
  is 
  a 
  thin 
  layer 
  of 
  Liorhynchus 
  multicosta, 
  at 
  522 
  

   one 
  of 
  Orthothetes 
  arctostriata, 
  and 
  at 
  524 
  one 
  of 
  Liorhynchus 
  

   quadricostata. 
  Orbiculoidea 
  media, 
  Amboccelia 
  umbonata 
  

   and 
  Modiomorpha 
  subalaia 
  are 
  everywhere 
  abundant. 
  Pha- 
  

   cops 
  rana 
  in 
  fine 
  examples, 
  and 
  Cryphaeus 
  Boothi 
  abound 
  

   toward 
  the 
  base 
  of 
  the 
  series. 
  

  

  No 
  other 
  Trilobites 
  were 
  observed. 
  

  

  Cephalopods 
  are 
  rare; 
  represented 
  by 
  occasional 
  examples 
  

   of 
  Goniatites 
  uniangularis, 
  Orthoceras 
  nuntium 
  and 
  0. 
  exile* 
  

  

  Gastropods: 
  Bdlerophon 
  Leda, 
  Pleurotomaria 
  Itys 
  and 
  

   Loxonema 
  delphicola 
  are 
  common; 
  Pleurotomaria 
  trilix, 
  P. 
  

   rugulata 
  and 
  Cyrtonella 
  mitella 
  are 
  also 
  found. 
  

  

  Lamellibeanchs 
  : 
  Modiomorpha 
  mytiloides, 
  Palmoneilo 
  

   fecunda, 
  P. 
  constricta 
  are 
  common 
  ; 
  Cypricardella 
  bellistriata, 
  

   Nucula 
  bellistriata, 
  Aviculopecten 
  exacutus, 
  Cypricardinia 
  

   indenta, 
  Panenka 
  cequilatera, 
  Lunulicardium 
  cf. 
  fragile 
  and 
  

   Nuculites 
  triqueter 
  are 
  the 
  occasional 
  species. 
  

  

  Brachiopods: 
  Chonetes 
  s'citula, 
  C. 
  coronata, 
  C. 
  dtflecta, 
  

   Amboccelia 
  praiumbona, 
  Stropheodonta 
  ptrplana, 
  Athyris 
  

   spiriferoides, 
  Atrypa 
  reticularis, 
  Spirifer 
  granulosus, 
  Orthis 
  

   Vanuxemi, 
  Lingula 
  Lemna. 
  

  

  Brtozoa 
  absent. 
  

  

  Corals 
  very 
  rare; 
  only 
  Streptelasma 
  rectum 
  and 
  Romin- 
  

   geria 
  sp. 
  ? 
  

  

  43 
  

  

  