﻿BEER 
  HEAD 
  AND 
  THE 
  ADJACENT 
  CLIFF-SECTIONS. 
  381 
  

  

  to 
  Upper 
  Greensand, 
  Gault, 
  or 
  Lower 
  Greensand. 
  Then, 
  again, 
  the 
  

   upper 
  limit 
  of 
  the 
  series 
  is 
  almost 
  equally 
  ill- 
  defined. 
  

  

  Subject 
  therefore 
  to 
  correction 
  as 
  to 
  the 
  age, 
  or 
  precise 
  geological 
  

   horizon, 
  of 
  the 
  highest 
  and 
  lowest 
  deposits, 
  the 
  grouping 
  of 
  the 
  

   beds 
  enumerated 
  in 
  the 
  previous 
  pages 
  should 
  probably 
  be 
  as 
  

   follows 
  : 
  — 
  

  

  Beds 
  1 
  to 
  3 
  may 
  represent 
  collectively 
  either 
  Gault, 
  or 
  Gault 
  

   and 
  Lower 
  Greensand 
  (in 
  part). 
  They 
  represent 
  also, 
  without 
  

   question, 
  the 
  so-called 
  " 
  Greensand 
  " 
  of 
  Blackdown. 
  

  

  Beds 
  4 
  to 
  9 
  inclusive 
  are 
  clearly 
  Upper 
  Greensand. 
  

  

  Beds 
  10 
  to 
  12, 
  although 
  attaining 
  in 
  the 
  Beer-Head 
  district 
  a 
  

   most 
  unusual 
  thickness, 
  must 
  be 
  referred 
  collectively 
  to 
  the 
  so-called 
  

   " 
  Chloritic 
  Marl" 
  of 
  the 
  Isle 
  of 
  Wight. 
  

  

  These 
  beds 
  (10 
  to 
  12), 
  in 
  their 
  mineral 
  character 
  especially, 
  have 
  

   much 
  in 
  common 
  with 
  the 
  higher 
  beds 
  of 
  the 
  Greensand 
  of 
  Warmins- 
  

   ter. 
  They 
  include, 
  also, 
  amongst 
  their 
  fossils 
  the 
  greater 
  portion 
  of 
  

   those 
  usually 
  quoted 
  as 
  Warminster 
  species. 
  There 
  is 
  little 
  doubt, 
  

   therefore, 
  that 
  the 
  fossiliferous 
  portion 
  of 
  the 
  so-called 
  " 
  Upper 
  

   Greensand 
  " 
  of 
  Warminster 
  is, 
  properly 
  speaking, 
  " 
  Chloritic 
  Marl 
  " 
  

   instead 
  of 
  " 
  Upper 
  Greensand 
  " 
  as 
  usually 
  stated. 
  And 
  this 
  point 
  

   is 
  of 
  some 
  importance. 
  

  

  Bed 
  13 
  represents 
  the 
  base-bed 
  of 
  the 
  Chalk 
  Marl, 
  or 
  that 
  part 
  of 
  

   the 
  Chalk 
  Marl 
  which, 
  in 
  so 
  many 
  localities, 
  contains 
  lumps 
  and 
  

   nodules 
  of 
  phosphatic 
  matter. 
  

  

  In 
  most 
  of 
  the 
  Devon 
  sections, 
  as, 
  indeed, 
  in 
  numerous 
  other 
  

   localities, 
  beds 
  12 
  and 
  13 
  are 
  distinctly 
  separated. 
  That 
  is 
  to 
  say, 
  

   the 
  Chalk 
  Marl 
  (bed 
  13) 
  rests 
  on 
  an 
  uneven 
  surface 
  of 
  the 
  Chloritic 
  

   Marl 
  (bed 
  12). 
  This, 
  again, 
  is 
  a 
  fact 
  of 
  much 
  importance 
  in 
  its 
  

   bearing 
  on 
  cretaceous 
  geology, 
  and 
  one 
  to 
  which 
  I 
  propose 
  to 
  refer 
  

   again 
  in 
  a 
  separate 
  paper. 
  

  

  Beds 
  14 
  to 
  17 
  represent 
  apparently 
  the 
  Chalk 
  Marl 
  (in 
  part) 
  and 
  

   the 
  Lower 
  Chalk 
  (in 
  part) 
  of 
  our 
  more 
  eastern 
  counties. 
  It 
  is 
  

   impossible, 
  however, 
  to 
  say 
  with 
  certainty 
  how 
  much 
  belongs 
  to 
  

   either. 
  

  

  Beds 
  18 
  and 
  19, 
  as 
  shown 
  by 
  their 
  fossils, 
  fall 
  in, 
  I 
  think, 
  undoubt- 
  

   edly 
  between 
  the 
  Lower 
  and 
  the 
  Upper 
  Chalk, 
  and 
  are 
  so 
  placer", 
  

   provisionally, 
  in 
  Table 
  II. 
  

  

  Bed 
  20 
  is 
  possibly 
  Upper 
  Chalk 
  (in 
  part). 
  I 
  cannot 
  vouch, 
  hoy 
  - 
  

   ever, 
  for 
  its 
  exact 
  horizon. 
  

  

  III. 
  Relation 
  of 
  the 
  Cretaceous 
  Hocks 
  of 
  the 
  Beer-Head 
  district 
  

   to 
  those 
  of 
  certain 
  other 
  localities. 
  

  

  This 
  paper 
  being 
  intended 
  simply 
  as 
  a 
  general 
  description, 
  I 
  have 
  

   not 
  thought 
  it 
  necessary 
  to 
  encumber 
  it 
  with 
  special 
  sections. 
  In 
  

   the 
  absence 
  of 
  such 
  sections, 
  however, 
  it 
  may 
  be 
  as 
  well 
  to 
  trace 
  

   out 
  briefly 
  the 
  relations 
  of 
  the 
  more 
  variable 
  strata 
  of 
  the 
  district 
  

   under 
  consideration 
  to 
  those 
  of 
  better-known 
  localities. 
  And 
  here 
  

   arises, 
  once 
  again, 
  the 
  question 
  of 
  the 
  age 
  of 
  the 
  lower 
  deposits. 
  

  

  The 
  age 
  of 
  the 
  beds 
  1 
  to 
  3, 
  which 
  form 
  the 
  lower 
  and 
  most 
  

  

  