﻿104 
  PROCEEDINGS 
  OF 
  THE 
  GEOLOGICAL 
  SOCIETY. 
  [Dec. 
  2, 
  

  

  The 
  accompanying 
  section 
  exhibits 
  the 
  general 
  geological 
  features 
  

   of 
  the 
  Belfast 
  Hills. 
  

  

  Fig. 
  1. 
  — 
  Section 
  from 
  the 
  River 
  Lagan 
  to 
  Black 
  Mountain. 
  

  

  Black 
  

   Mountain. 
  

  

  Fall' 
  

   Road 
  

  

  River 
  River 
  

  

  Blackstafr. 
  Stranmillis. 
  Lagan. 
  

  

  5 
  = 
  

  

  1. 
  Basalt. 
  

  

  2. 
  Hard 
  Chalk. 
  

  

  3. 
  Greensand. 
  

  

  4. 
  Lias. 
  

  

  5. 
  Keupen 
  

  

  6. 
  Tertiary 
  Sands. 
  

  

  3. 
  Zone 
  ofAvicula 
  contorta. 
  — 
  Sections 
  of 
  this 
  formation 
  have 
  been 
  

   examined 
  in 
  the 
  escarpment 
  of 
  the 
  Belfast 
  Hills, 
  extending 
  from 
  

   near 
  Lisburn 
  to 
  Whitehead, 
  a 
  distance 
  of 
  24 
  miles. 
  

  

  From 
  Moira, 
  15 
  miles 
  from 
  Belfast, 
  to 
  Kilcorig, 
  9 
  miles 
  south-west 
  

   of 
  Belfast, 
  the 
  Avicula-contorta 
  beds 
  are 
  absent, 
  the 
  Hard 
  Chalk 
  

   lying 
  directly 
  upon 
  the 
  Keuper 
  Marl. 
  

  

  In 
  Colin 
  Glen, 
  5 
  miles 
  south-west 
  of 
  Belfast, 
  the 
  greatest 
  deve- 
  

   lopment 
  of 
  the 
  Liassic 
  series 
  occurs. 
  

  

  This 
  locality 
  is 
  referred 
  to 
  by 
  General 
  Portlock 
  in 
  his 
  Report, 
  

   p. 
  107. 
  Treating 
  of 
  the 
  section 
  at 
  Lisnagrib, 
  the 
  beds 
  of 
  which 
  are 
  now 
  

   identified 
  with 
  the 
  Avicula-contorta 
  zone, 
  he 
  says, 
  " 
  It 
  may 
  be 
  re- 
  

   marked 
  that 
  the 
  shaly 
  bed 
  containing 
  Carclium 
  strialulum 
  [C.Hhosti- 
  

   cum] 
  is 
  again 
  found 
  40 
  miles 
  distant 
  in 
  Colin 
  Glen, 
  near 
  Belfast; 
  but 
  as 
  

   yet 
  the 
  calcareous 
  grit*, 
  with 
  the 
  teeth 
  and 
  scales, 
  has 
  not 
  been 
  

   there 
  discovered." 
  It 
  is 
  very 
  gratifying 
  to 
  me 
  to 
  be 
  able 
  to 
  report 
  

   the 
  presence 
  of 
  these 
  forms. 
  Prom 
  the 
  following 
  sections 
  it 
  will 
  be 
  

   observed 
  that 
  a 
  fish-bed 
  is 
  a 
  marked 
  feature 
  of 
  this 
  zone 
  throughout 
  

   the 
  neighbourhood. 
  In 
  addition 
  to 
  the 
  species 
  observed 
  by 
  Portlock, 
  

   I 
  have 
  found 
  two 
  others. 
  

  

  It 
  is 
  interesting 
  to 
  note 
  the 
  great 
  variety 
  of 
  lithological 
  characters 
  

   that 
  occurs 
  in 
  the 
  Colin 
  Glen 
  Section 
  of 
  the 
  Rhsetic 
  series. 
  

  

  * 
  " 
  The 
  section 
  at 
  Lisnagrib 
  principally 
  consists 
  of 
  alternating 
  beds 
  of 
  dark 
  

   shale 
  and 
  calcareous 
  grit." 
  

  

  