﻿1863.] 
  TATE 
  LIAS 
  OF 
  BELFAST. 
  107 
  

  

  ft. 
  in. 
  

  

  7. 
  Black 
  Shales 
  3 
  2 
  

  

  8. 
  Argillaceous 
  Limestone 
  1 
  

  

  9. 
  Stiff 
  calcareous 
  Clay 
  8 
  

  

  10. 
  Black 
  Shales 
  with 
  Placunopsis 
  alpina, 
  &c. 
  . 
  . 
  10 
  

  

  11. 
  Fish-bed 
  1 
  

  

  12. 
  Black 
  Shale 
  1 
  7 
  

  

  13. 
  Soft 
  micaceous 
  Sandstone 
  3 
  

  

  14. 
  Black 
  Shales 
  1 
  2 
  

  

  Yariegated 
  Marls 
  . 
  . 
  . 
  

  

  19 
  4J 
  

  

  The 
  zone 
  ofAvicida 
  contorta 
  is 
  thus 
  represented 
  in 
  this 
  neighbour- 
  

   hood 
  by 
  a 
  succession 
  of 
  shales 
  of 
  variable 
  thickness, 
  alternating 
  with 
  

   argillaceous 
  limestones 
  varying 
  from 
  1 
  inch 
  to 
  6 
  inches 
  in 
  thick- 
  

   ness, 
  with 
  some 
  soft 
  sandstones 
  in 
  the 
  lower 
  part. 
  The 
  maximum 
  

   thickness 
  attained 
  being 
  in 
  Colin 
  Glen, 
  namely, 
  21 
  feet 
  6 
  inches. 
  

  

  In 
  all 
  the 
  sections 
  given, 
  the 
  Avicula- 
  contorta 
  beds 
  are 
  seen 
  resting 
  

   on 
  the 
  Keuper 
  Marls. 
  There 
  is 
  no 
  gradation 
  ; 
  the 
  change 
  is 
  most 
  

   marked 
  — 
  the 
  red 
  and 
  blue 
  marls 
  presenting 
  a 
  striking 
  contrast 
  to 
  

   the 
  Black 
  Shales 
  above. 
  

  

  Fossils 
  of 
  the 
  Avicula-contorta 
  Zone. 
  

  

  No. 
  

  

  Species. 
  

  

  Localities. 
  

  

  Colin 
  

   Glen. 
  

  

  Cave 
  

   Hill. 
  

  

  Wood- 
  

   burn. 
  

  

  White- 
  

   head. 
  

  

  1 
  

  

  2 
  

   3 
  

   4 
  

   5 
  

   6 
  

   7 
  

  

  8 
  

   9 
  

  

  10 
  

   11 
  

   12 
  

   13 
  

   14 
  

   15 
  

   16 
  

  

  Ichthyosaurus, 
  femur 
  and 
  teeth 
  

  

  * 
  

  

  * 
  

  

  # 
  

   * 
  

  

  * 
  

  

  * 
  

  

  * 
  

   * 
  

  

  * 
  

  

  * 
  

  

  * 
  

  

  * 
  

   * 
  

   * 
  

   * 
  

  

  * 
  

   * 
  

  

  * 
  

  

  * 
  

  

  * 
  

   * 
  

  

  * 
  

  

  

  Gyrolepis 
  Albertii, 
  Aqass 
  

  

  tenuistriatus, 
  Agass 
  

  

  Acrodus 
  minimus, 
  Agass 
  

  

  Acrodus, 
  n. 
  sp 
  

  

  Saurichthys 
  apicalis, 
  Aqass 
  

  

  Natica 
  Oppeli, 
  Moore 
  

  

  Trochus 
  Waltoni, 
  Moore 
  

  

  

  Pecten 
  Valoniensis, 
  Defrance 
  

  

  Axinus 
  cloacinus, 
  Quenstedt 
  

  

  Avicula 
  contorta, 
  Portlock 
  

  

  Cardium 
  Pvhajticum, 
  Merian 
  

  

  

  Placunopsis 
  alpina, 
  Winkler 
  

  

  Myophoria 
  postera, 
  Bronn 
  

  

  

  5. 
  Zone 
  of 
  the 
  White 
  Lias. 
  — 
  The 
  beds 
  have 
  a 
  close 
  resemblance 
  to 
  

   the 
  variegated 
  marls 
  of 
  the 
  Keuper 
  ; 
  and, 
  bnt 
  for 
  the 
  well-marked 
  

   succession 
  and 
  the 
  presence 
  of 
  Cardium 
  Rhceticum, 
  one 
  would 
  be 
  

   very 
  much 
  disposed 
  to 
  refer 
  them 
  to 
  that 
  period. 
  

  

  