﻿SUBDIVISIONS 
  OF 
  THE 
  SPEETON 
  CLAY. 
  

  

  597 
  

  

  In 
  the 
  list 
  given 
  below, 
  the 
  fossils 
  of 
  the 
  Echinospatangus-bed, 
  so 
  

   far 
  as 
  they 
  have 
  been 
  determined, 
  are 
  separately 
  indicated. 
  

  

  Top 
  Beds 
  of 
  J&cuhim-zone. 
  — 
  The 
  remaining 
  9 
  or 
  10 
  feet 
  of 
  the 
  

   Bel. 
  jaculum-zone 
  lying 
  above 
  the 
  Echinospatangus-bed 
  show 
  alter- 
  

   nations 
  of 
  dark 
  and 
  pale 
  clays 
  in 
  thin 
  bands, 
  containing 
  the 
  cha- 
  

   racteristic 
  Belemnite, 
  along 
  with 
  Vermicularia 
  Sowerbyi 
  and 
  other 
  

   fossils. 
  The 
  npper 
  limit 
  of 
  the 
  zone 
  is 
  well 
  defined 
  by 
  a 
  thin 
  donble- 
  

   bed 
  of 
  curiously 
  mottled 
  clay, 
  the 
  lower 
  four 
  inches 
  being 
  pale 
  in 
  

   colour 
  with 
  dark 
  markings, 
  while 
  the 
  upper 
  five 
  inches 
  show 
  pale 
  

   markings 
  on 
  a 
  dark 
  ground, 
  the 
  two 
  together 
  forming 
  an 
  easily 
  

   recognizable 
  and 
  conspicuous 
  band. 
  Above 
  this 
  horizon 
  new 
  species 
  

   of 
  Belemnites 
  appear. 
  The 
  clays 
  of 
  this 
  part 
  of 
  the 
  series 
  are 
  well 
  

   exposed 
  in 
  Black 
  Cliff 
  where 
  the 
  sea 
  washes 
  the 
  base 
  of 
  the 
  great 
  

   landslip 
  ; 
  and 
  they 
  are 
  repeated 
  in 
  a 
  similar 
  position 
  further 
  south 
  

   under 
  the 
  north 
  slopes 
  of 
  the 
  Speeton 
  Beck 
  Ridge, 
  where 
  they 
  occupy 
  

   a 
  position 
  so 
  much 
  higher 
  than 
  is 
  indicated 
  in 
  adjoining 
  beach- 
  

   exposures, 
  that 
  a 
  small 
  fault 
  throwing 
  about 
  20 
  feet 
  to 
  the 
  north 
  

   probably 
  crosses 
  into 
  the 
  cliff 
  between 
  the 
  two 
  points 
  (see 
  ground- 
  

   plan, 
  fig. 
  1, 
  p. 
  578). 
  The 
  mottled 
  bands 
  may 
  also 
  be 
  traced 
  high 
  

   up 
  on 
  the 
  ridge 
  between 
  Black 
  and 
  Middle 
  Cliffs. 
  

  

  Fossils 
  of 
  the 
  Zone 
  of 
  Belemnites 
  jaculum, 
  Phil. 
  

  

  

  

  -d 
  

  

  

  

  

  Ti 
  

  

  

  

  

  

  

  3 
  

   o 
  

  

  

  

  

  % 
  

  

  nd 
  

  

  

  

  

  

  

  

  

  . 
  

  

  ~ 
  

  

  CD 
  

   rQ 
  

  

  

  

  

  

  

  

  >> 
  

  

  13 
  

  

  2 
  

  

  CO 
  

  

  I 
  s 
  

  

  

  

  

  02 
  

  

  rd"M 
  

  

  

  !* 
  

  

  ■3 
  

  

  ■| 
  c? 
  

  

  -i 
  

  

  

  02 
  

  

  

  CD 
  

  

  §3 
  

  

  CD 
  u 
  

  

  r^3 
  

  

  13 
  

  

  1 
  

  

  1 
  

  

  ^13 
  

  

  to 
  CD 
  

  

  

  0Q 
  

  

  6 
  

  

  CD 
  

  

  

  o 
  

  

  

  f-l 
  

  

  1 
  

  

  ■to 
  

  

  ^ 
  

  

  ^ 
  

   ^ 
  

  

  o 
  

  

  a 
  

  

  

  

  Bl. 
  

  

  Oil. 
  

  

  C10,9,8. 
  

  

  7,6. 
  

  

  5,4- 
  

  

  3. 
  

  

  2,1. 
  

   x 
  

  

  B. 
  

  

  * 
  

  

  Belemnites 
  jaculum, 
  Phil 
  

  

  

  * 
  

  

  * 
  

  

  # 
  

  

  , 
  var. 
  pistilliformis, 
  

  

  

  

  

  

  

  

  

  

  

  Blainv. 
  ... 
  

  

  

  

  ... 
  

  

  # 
  

  

  X 
  

  

  

  

  

  

  (resembling 
  sulcatus, 
  Mill.) 
  

  

  

  (see 
  Appendix, 
  p. 
  612) 
  

  

  

  

  

  X 
  

  

  

  

  

  

  x 
  

  

  Ammonites 
  noricus, 
  Schloth., 
  and 
  

  

  

  

  

  

  

  

  

  

  

  varieties 
  

  

  

  * 
  

  

  X 
  

  

  x 
  

  

  

  

  

  

  

  speetonensis, 
  Y. 
  $• 
  B., 
  var. 
  

  

  

  

  

  

  

  

  

  

  

  concinnus, 
  Phil 
  

  

  

  

  

  

  # 
  

  

  

  

  

  

  , 
  var. 
  venustus, 
  Phil. 
  . 
  . 
  . 
  

  

  

  

  

  

  6* 
  

  

  

  * 
  

  

  

  

  Nisus?, 
  BOrb. 
  (planus, 
  Phil.) 
  

  

  

  

  

  '?' 
  

  

  * 
  

  

  

  

  

  

  nucleus, 
  Phil 
  

  

  

  

  

  

  

  * 
  

  

  ■X- 
  

  

  x 
  

  

  ? 
  

  

  marginatus, 
  Phil 
  

  

  

  

  

  

  -x 
  

  

  

  # 
  

  

  X 
  

  

  

  rotula, 
  Sow 
  

  

  

  x 
  

  

  

  # 
  

  

  ?* 
  

  

  

  

  

  

  angulicostatus 
  ?, 
  D' 
  Orb 
  

  

  

  

  

  * 
  

  

  

  

  

  

  

  Astierianus, 
  B 
  Orb 
  

  

  

  

  

  -X- 
  

  

  * 
  

  

  

  X 
  

  

  

  

  hystrix?, 
  Phil 
  

  

  

  

  

  * 
  

  

  

  

  

  

  

  