﻿The 
  Carboniferous 
  

  

  Hocks 
  at 
  Loughshinny. 
  495 
  

  

  Stratigraphical 
  Zones. 
  

  

  Thickness 
  

   in 
  feet. 
  

  

  Palaontological 
  Zones. 
  

  

  Correlation 
  with 
  

   the 
  Bush 
  area. 
  

  

  Not 
  represented. 
  

  

  Loughshinny 
  Black 
  

  

  110 
  

  

  Upper 
  Posidonomya- 
  

  

  Shales. 
  

  

  

  Zone. 
  (P 
  3 
  ) 
  

  

  

  Posidon 
  omy 
  a-Limestone 
  

  

  260 
  

  

  Lower 
  Posidonomya- 
  

  

  Do. 
  

  

  Group. 
  

  

  

  Zone. 
  (P 
  x 
  ) 
  

  

  

  Cyathaxonia-Beds 
  (base 
  

  

  200 
  

  

  Cyathaxonia-mbzone 
  

  

  Cyathaxonia-Be&s 
  

  

  not 
  seen). 
  

  

  

  (locally 
  divisible 
  

  

  of 
  Bathing-Place 
  

  

  

  

  into 
  1)36 
  

  

  & 
  Giants 
  Hill. 
  

  

  

  

  D3a 
  

  

  

  

  

  but 
  overlapping). 
  

  

  

  (Gap) 
  

  

  (Gap) 
  

  

  

  

  Dibunophyllum 
  - 
  Lime- 
  

  

  100 
  

  

  Upper 
  Dibunophyllwm- 
  

  

  Curkeen 
  - 
  Hill 
  

  

  stone. 
  

  

  

  Zone. 
  (D 
  2 
  ) 
  

  

  Limestone. 
  

  

  (Gap) 
  

  

  (Gap) 
  

  

  

  

  Holmpatrick 
  Limestone 
  

  

  180 
  

  

  \ 
  

  

  ? 
  Carlyan 
  Lime- 
  

  

  Lane 
  Conglomerate. 
  

  

  200 
  

  

  !?D 
  (of 
  unknown 
  

   [ 
  position). 
  

  

  stone. 
  

   ? 
  Eush 
  Conglom- 
  

   erate-Group. 
  

  

  Lane 
  Limestones. 
  

  

  60 
  

  

  ; 
  

  

  ? 
  Bush 
  Slates 
  

   (top 
  part 
  only). 
  

  

  2. 
  ' 
  A 
  Note 
  on 
  the 
  Petrology 
  and 
  Physiography 
  of 
  Western 
  

   Liberia 
  (West 
  Coast 
  of 
  Africa).' 
  By 
  John 
  Parkinson, 
  M.A., 
  F.G.S. 
  

  

  The 
  country 
  is 
  low-lying, 
  with 
  a 
  gradual 
  rise 
  northward 
  from 
  shore 
  - 
  

   level, 
  and 
  rivers 
  mature 
  in 
  character 
  with 
  alluvial 
  flats 
  raised 
  above 
  

   flood-level. 
  Where 
  the 
  Biver 
  Tuma 
  falls 
  into 
  the 
  Biver 
  St. 
  Paul 
  

   the 
  remnant 
  of 
  a 
  hanging 
  valley 
  can 
  be 
  seen. 
  Flat-topped 
  ridges 
  

   and 
  isolated 
  hills 
  trending 
  parallel 
  to 
  the 
  foliation 
  of 
  the 
  gneiss 
  

   are 
  characteristic 
  of 
  the 
  country 
  around 
  Sanoyei 
  and 
  Boporo. 
  

   There 
  is 
  a 
  striking 
  absence 
  of 
  late 
  deposits 
  of 
  old 
  gravels 
  and 
  

   sands. 
  

  

  In 
  the 
  southern 
  part 
  of 
  the 
  district 
  there 
  are 
  indications 
  of 
  a 
  

   series 
  of 
  garnetiferous 
  gneisses, 
  tremolite-schists, 
  kyanite-schists 
  

   or 
  gneisses, 
  garnet-graphite-gneisses, 
  etc., 
  associated 
  with 
  others 
  of 
  

   granitic 
  type, 
  the 
  latter 
  being 
  apparently 
  free 
  from 
  microcline 
  and 
  

   containing 
  a 
  pleochroic 
  pyroxene. 
  These 
  rocks 
  are 
  replaced 
  in 
  the 
  

   north 
  by 
  biotite-gneisses 
  and 
  hornblende-schists, 
  which 
  have 
  an 
  

   approximate 
  and 
  singularly 
  constant 
  east-and-west 
  (magnetic) 
  strike 
  

   in 
  their 
  foliation. 
  Microcline 
  is 
  common. 
  These 
  old 
  crystalline 
  

   rocks 
  are 
  cut 
  by 
  an 
  extensive 
  series 
  of 
  basalts 
  and 
  ophitic 
  dolerites, 
  

   resembling 
  so 
  closely 
  the 
  post-Cretaceons 
  dykes 
  of 
  Southern 
  Nigeria, 
  

   that 
  it 
  is 
  difficult 
  to 
  avoid 
  the 
  conclusion 
  that 
  they 
  are 
  of 
  the 
  same 
  

  

  