A  TCrj  hard  Wood-red  forrugiiKnu  con-
glomcralc  at  tlie  ham  of  the  Gault,
maintiLiiiiiig  a  unifurm  thickneu  of
about  foui  utclica,  and  teeting  on


(s)  The  Lower  GreeiuaDd,  thirty  feet  of
which  ia  exposed  in  the  cutting.  The
colour  of  thi:  Lower  Greciuund  Tarioi
from  huff  to  orange ;  its  upper  part,
(dJ,  immediuttJy  under  the  baiid  (cj
being  itained  to  the  depth  of  a  few
inoho  of  a  bright  blood-red.
The  peculiar  clear  red  of  anhydrous  aesquioxide  of  iron  is  rare  in
the  British  Cretaceous  rocks,  and  notably  distinct  from  the  yellow
and  orange  tints  pervading  the  Lower  Greensand.  UTie  red  band
c,  like  the  red  rock  at  Hunstanton,  abounds  in  small  quartz  pebbles,
held  together  by  the  ferruginous  matrix.
Is  it  possible  that  it  may  bo  the  southern  extension  of  the  red
rock  of  Hunstanton  and  Speeton,  expanded  to  six  or  seven  feet
thick  at  Hunstanton,  and  further  north  to  thirty  feet  at  Speoton?
The  Gault  docs  not  seem  to  have  any  certain  representative  in  the
north.  The  position  of  the  Fettloworth  red  bed  at  the  top  of  the
Jjower  Grcoiisaud  agrees  with  that  assigned  by  Mr.  Wiltshire  for
the  Hunstanton  red-rock  overlying  the  "  Corstone,"  and  is  not  in-
oonsist«nt  with  tlio  horizon  suggested  by  Mr.  Judd  for  the  Bed
Chalk,  south  of  Speeton,  resting  unconformably  on  beds  supposed  to
be  the  equivalent  of  the  Upper  Neooomian.
336  Correspondence — Mr  J.  E.  Taylor.
The  intercalation  of  a  thin  red  band,  lai^ly  oomposed  of  an-
hydrous BOBquioxide  of  iron,  between  beds  of  such  different  physical
character,  is  difficult  of  explanation.  The  line  of  demarcation  is
remarkably  definite,  no  gradation  existing  between  the  red  stratom
and  the  Gault  above  or  the  Lower  Greensand  below. — Gxo.  Ma.w.
Bbnthall  Hall,  Brobblt,  May  28<A,  1869.
SINGULAR  SUBSIDENCE  AT  MARTON.
