74  PROCEEDINGS  OE  THE  GEOLOGICAL  SOCIETY.  [May  1 893, 
Since  the  identification  of  the  Westleton  shingle  at  points  so  wide 
apart  seems  mainly  based  on  lithological  grounds,  it  is  important  to 
notice  its  distinctive  features.  Prof.  Prestwich  states  that  this 
shingle  consists  of  drifts  from  the  south  and  south-east.  The  flint- 
pebbles  were  derived  from  shingle-beds  of  Tertiary  age  in  Belgium, 
the  North  of  Prance,  and  Kent;  the  quartz-pebbles  directly 
or  indirectly  from  the  Ardennes ;  the  subangular  flints  directly 
from  the  Chalk  or  from  an  older  Drift ;  chert  and  ragstone 
from  the  Lower  Greensand  of  Kent  and  Surrey,  or  indirectly  from 
the  Southern  Drift.  The  marine  nature  of  the  beds  is  inferred  from 
the  included  fossils  of  the  type-area,  and  the  absence  of  these  else¬ 
where  is  accounted  for  by  decalcification.  With  reference  to  this 
point,  it  may  be  as  well  to  remember  that  the  Westleton  Beds  on 
Westleton  Common  are  unfossiliferous,  and  that  the  Mundesley 
facies  of  this  series  is  mainly  freshwater. 
In  conclusion,  Prof.  Prestwich  states  his  belief  that  the  Westleton 
shingle  must  have  been  formed  on  a  comparatively  level  sea-floo 
throughout  the  area  over  which  its  outliers  extend,  and  that  the 
irregularities  in  distribution  have  been  produced  by  subsequent 
differential  elevatory  movements.  He  gave  a  diagram-section 
across  the  Thames  at  Goring,  which  yields  a  means  for  estimating 
the  amount  of  earth-sculpture  effected  there  since  the  presumed 
equivalents  of  the  W  estleton  shingle  were  continuous  from  side  to 
side  of  the  valley.  He  thus  arrives  at  the  conclusion  that  the 
deepening  of  the  gorge  amounted  to  about  160  feet  during  the  early 
Glacial  Peiiod,  to  220  feet  during  the  later  Glacial  Period,  and  to  70 
feet  during  the  post-Glacial  Period.  Surely  this  amount  of  work  is 
scarcely  in  accordance  with  the  moderate  limits  which,  in  another 
paper,  he  is  disposed  to  assign  to  the  entire  Glacial  Period. 
The  last  paper  which  it  seems  necessary  to  notice  in  connexion 
with  the  Pleistocene  Geology  of  the  South-east  of  England  is  one  by 
Mr.  E.  T.  Newton  on  the  Cetacea  of  the  Norfolk  Porest-bed.  He 
identified  the  Sperm  Whale  and  a  species  of  Balcena  which  is  most 
probably  B.  biscayensis.  Of  other  vertebrae  from  the  Porest-bed  oae 
was  referred  to  Bahama  and  another  to  Balamoptera.  This  collec¬ 
tion  was  regarded  as  a  fair  epitome  of  the  Cetaceans  now  inhabiting 
British  seas,  since  it  contained  examples  of  all  the  leading  types, 
while  curiously  enough  the  large  land  Mammals  of  the  Porest-bed  are 
said  to  be  extinct.  Under  these  circumstances,  and  bearing  in  mind 
how  differently  the  Cetacea  are  represented  in  the  true  Crags,  it 
seems  only  natural  to  regard  the  Porest-bed  as  a  local  phase  of  the 
