﻿594 
  DR. 
  W. 
  ERASER 
  HUME 
  ON 
  [Dec. 
  1 
  89 
  7, 
  

  

  formity 
  at 
  the 
  summit 
  of 
  the 
  Callianassa-hed, 
  this 
  being 
  immediately 
  

   overlain 
  by 
  the 
  conglomeratic 
  mulatto-stone 
  of 
  the 
  zone 
  of 
  Belem- 
  

   nitella 
  [Actinocamax'] 
  vera. 
  The 
  break 
  is 
  still 
  more 
  marked 
  in 
  

   other 
  portions 
  of 
  the 
  Central 
  Division, 
  where 
  the 
  same 
  zone 
  overlies 
  

   the 
  Yellow 
  Sandstones 
  with 
  clear 
  unconformable 
  junction. 
  The 
  

   Chloritic 
  Sands 
  of 
  the 
  Eastern 
  Division 
  mainly 
  consist 
  of 
  arenaceous 
  

   glauconitic 
  limestones 
  (containing 
  Inoceramus-fragments 
  and 
  Spon- 
  

   dylus 
  spinosus), 
  which 
  extend 
  farther 
  northward 
  than 
  the 
  beds 
  

   previously 
  described, 
  thus 
  presenting 
  a 
  distinct 
  case 
  of 
  overlap. 
  

   Spondylus 
  spinosus 
  occurs 
  in 
  the 
  Chloritic 
  Sands 
  as 
  far 
  south 
  as 
  

   Cave 
  Hill, 
  and 
  as 
  far 
  north 
  as 
  Glenarm. 
  These 
  beds 
  are 
  also 
  present 
  

   in 
  the 
  Northern 
  Division, 
  as 
  at 
  Tircreven 
  Burn. 
  

  

  Eastern 
  Division. 
  (Zone 
  of 
  Inoceramus 
  Crispi 
  ?) 
  

  

  While 
  easily 
  distinguishable 
  from 
  the 
  greenish-yellow 
  sand 
  of 
  

   the 
  Exogyra 
  columba-zone, 
  the 
  Inoceramus-zone 
  passes 
  insensibly 
  

   above 
  into 
  that 
  of 
  Ecliinocorys 
  gibbus. 
  

  

  Principal 
  fossils 
  : 
  — 
  Pisces 
  : 
  Scapanorhynclius 
  rhaphiodon, 
  Ag., 
  

   Ptychodus 
  latissimus, 
  Ag., 
  Anomceodus 
  sp. 
  

  

  Gasteropoda 
  : 
  Pleurotomaria 
  perspective 
  Mant. 
  

  

  Pelecypoda 
  Monomyaria 
  : 
  Inoceramus 
  sp. 
  (fragments 
  abundant), 
  

   Ostrea 
  semiplana, 
  Sow., 
  Pecten 
  \Janira'] 
  quinquecostatus, 
  Sow., 
  

   JSpondylus 
  spinosus, 
  Sow. 
  

  

  Brachiopoda 
  : 
  Rhynchonella 
  plicatilis, 
  Sow., 
  Rh. 
  limbata, 
  Schloth., 
  

   Rh. 
  robusta, 
  Tate. 
  

  

  Vermes 
  : 
  Serpida 
  filiformis, 
  Sow. 
  

  

  Polyzoa 
  : 
  Spiropora 
  sp. 
  

  

  Echinodermata 
  : 
  Micraster 
  breviporus, 
  Ag., 
  Catopygus 
  colum- 
  

   barius, 
  Lam. 
  (both 
  at 
  the 
  base). 
  Cidaris 
  clavigera, 
  Konig, 
  also 
  

   probably 
  belongs 
  here. 
  Spines 
  of 
  Cidaris 
  sp. 
  abundant. 
  

  

  At 
  Woodburn, 
  Larne, 
  and 
  Whitehead, 
  we 
  have 
  in 
  addition 
  found 
  

   the 
  following 
  associated 
  with, 
  or 
  below, 
  the 
  beds 
  of 
  Inoceramus- 
  

   fragments 
  : 
  — 
  Ecliinocorys 
  vulgaris, 
  Breyn., 
  var. 
  ovatus 
  (Larne), 
  and 
  

   E. 
  gibbus, 
  Lam. 
  (Woodburn), 
  Galerites 
  albogalerus, 
  var. 
  angulosus, 
  

   Desor 
  (Larne 
  and 
  Whitehead), 
  Terebratula 
  carnea, 
  Sow. 
  (flattened 
  

   type), 
  T. 
  semiglobosa, 
  Sow., 
  and 
  Camerospongia 
  fungiformis, 
  Goldf. 
  

   (Larne). 
  In 
  general, 
  however, 
  these 
  last-mentioned 
  species 
  are 
  

   restricted 
  to 
  the 
  highest 
  portion 
  of 
  the 
  glauconitic 
  sandy 
  limestones, 
  

   beds 
  which 
  Tate 
  would 
  probably 
  class 
  with 
  the 
  Chloritic 
  Chalk. 
  

  

  • 
  

  

  As 
  already 
  stated, 
  the 
  lowest 
  4 
  feet 
  of 
  glauconitic 
  sand 
  with 
  

   Vermicular 
  ice, 
  Ostrea 
  carinata, 
  and 
  Exogyra 
  columba, 
  must 
  be 
  

   regarded 
  as 
  Upper 
  Greensand 
  or 
  Cenomanian, 
  the 
  occurrence 
  of 
  

   Rhynchonella 
  Schloenbachi 
  in 
  quantity 
  at 
  Whitehead 
  also 
  showing 
  

   the 
  existence 
  of 
  the 
  zone 
  of 
  Exogyra 
  columba 
  in 
  this 
  division. 
  

   There 
  is 
  no 
  apparent 
  lithological 
  break 
  between 
  these 
  sands 
  and 
  

   the 
  overlying 
  Rhynchonella-ba.nd, 
  but 
  every 
  evidence 
  of 
  the 
  

   existence 
  of 
  palseontologieal 
  unconformity. 
  

  

  Having 
  recently 
  visited 
  the 
  Chalk 
  Rock 
  of 
  Hertfordshire, 
  etc., 
  

  

  