82 
key.  a.  irving  on  the  ease  of 
[-Feb.  1893, 
railway-station  and  Aylesbeare,  as  it  is  farther  south  round  about 
East  Budleigh :  but  between  Harpford  and  Ottery  St.  Mary  the 
basement-breccia  is  not  easily  traced,  owing  to  the  want  of  good 
exposures. 
Now,  when  we  recollect  that  the  Otter  River  falls  from  about 
80  feet  (O.D.)  at  Newton  Poppleford  to  its  mouth,  and  when  we 
allow  for  the  difference  of  level  between  Ordnance  datum  and  the 
breccia  at  Otterton  Point,  allowing  also  for  the  effect  of  the  faulting 
visible  in  the  coast-section  about  Ladram  Bay,  the  aggregate  of 
which,  according  to  Mr.  Ussher’s  estimate,  would  be  about  60  feet 1 
(this  may  be  less  than  the  real  amount),  and  the  probability  of 
some  repetition  of  the  breccia  at  slightly  different  horizons,  I  think 
there  can  no  longer  be  any  doubt,  in  the  light  of  the  facts  described 
in  this  paper,  that  we  have  succeeded  in  tracing  the  true  base  of  the 
Keuper  along  the  left  bank  of  the  Otter,  which  for  many  miles  seems 
to  mark  the  western  limit  of  that  formation  in  Devonshire. 
If  this  conclusion  be  admitted,  several  interesting  results  would 
seem  to  follow. 
(1)  The  palaeontological  difficulty,  which  the  occurrence  of 
remains  of  Hyperodapedon  in  the  sandstones  east  of  the  Otter- 
mouth  still  presented  (after  the  difficulty,  which  had  appeared  to 
some  writers  to  follow  from  the  occurrence  of  Labyrinthodont 
remains,  had  been  explained  away  in  my  paper  of  last  year),  is  now 
removed,  since  the  sandstones  in  which  the  remains  in  question  were 
found  are  stratigraphically  above  the  Keuper  basement-breccias; 
and,  so  far  as  our  present  knowledge  goes,  the  stratigraphy  and  the 
palaeontology  of  the  Devon  Trias  are  thus  brought  into  complete 
accord.  The  parallelism  between  the  Trias  (properly  so-called)  of 
Devonshire  and  that  of  the  Midland-Severn- Cheshire  area  seems  to 
be  fully  established,  as  tabulated  by  Prof.  Hull  in  his  paper  of  last 
year,  and  shown  in  the  section  which  accompanies  that  paper.2 
(2)  The  statement  contained  in  the  paragraph  of  my  paper  of 
last  year — “For  the  reasons  here  given . in  company  with 
Prof.  Hull  ”  (p.  71) — needs  some  modification.  Prof.  Hull  in  fact 
only  had  an  opportunity  of  examining  the  rocks  lying  west  of  the 
Otter ;  and  I  am  glad  to  take  this  occasion  of  correcting  the  over¬ 
sight  contained  in  the  statement  here  referred  to.  It  is  hardly 
necessary  to  observe  that  the  reference  of  these  false-bedded  Lower 
Keuper  sandstones  to  the  Bunter  is  superseded  by  the  results  given 
in  this  paper. 
(3)  Our  geological  maps  of  the  Devon  area  require  considerable 
revision,  to  the  extent  of  cutting  off  from  the  western  margin  of 
the  Keuper  a  fairly  good  slice,  as  it  is  shown  on  Sir  A.  C.  Ramsay’s 
map  of  England  and  Wales,  while  the  Upper  Bunter  will  have  to 
be  introduced  in  the  valley  of  the  Sid,  owing  to  repetition  by  faulting. 
It  is,  however,  satisfactory  to  note  that  only  a  small  correction  for 
1  The  algebraic  sum  of  Mr.  Ussher’s  measurements  is  50  — 5  +  14  =  59  feet. 
See  Quart.  Journ.  Geol.  Soc.  vol.  xxxii.  (1876)  p.  381. 
2  Ibid.  Yol.  xlviii.  pp.  66-67. 
