202 
COAST-SECTIONS  AT  THE  LIZAED. 
[May  1893. 
( b )  Folding  and  Faulting  of  the  Complex. 
We  have  now  to  consider  the  effects  of  folding  and  faulting  in 
the  banded  complex  of  schist  and  serpentine.  These  may  be  studied 
in  the  neck  at  the  small  promontory  which  for  convenience  of 
description  we  have  called  Potstone  Point,  and  also  on  the  cliff-slopes 
Fig.  1.  Fig.  2. 
Folding  of  Serpentine  and  Schist  at  +  on  eastern  border 
of  a  (see  Map). 
south-east  of  it.  On  the  eastern  margin  of  the  banded  schist  a 
at  +  in  the  Map,  the  serpentine  is  distinctly  seen  to  be  folded 
with  the  schist  as  represented  in  fig.  1,  and  a  little  to  the  right 
the  schist  tongues  out  as  indicated  in  fig.  2.  The  most  conclusive 
evidence  of  interfolding  is,  however,  furnished  by  mapping  portions 
of  the  cliff-slopes,  an  operation  attended  with  some  difficulty  on 
account  of  the  movement  which  is  going  on,  and  the  quantity  of 
loose  talus  which  covers  certain  areas.  In  Trans.  Hoy.  Geol. 
Soc.  Cornwall,  vol.  xi.  part  iv.  p.  215,  one  of  us  published  a  map 
showing  the  mutual  relations  of  serpentine,  schist,  and  basic  dykes 
at  Potstone  Point.  We  have  since  then  extended  our  observations, 
and  the  result  is  given  in  the  Map  which  is  seen  on  the  opposite  page. 
The  phenomena  are  represented  as  they  actually  appear  on  the 
sloping  face,  and  not  as  they  would  appear  on  a  horizontal  plane. 
We  wish  to  direct  special  attention  to  a  small  area  in  the  central 
portion  of  the  Map,  which  we  have  drawn  on  a  scale  of  50  feet  to  the 
inch.  At  e  is  a  patch  of  schist  surrounded  on  all  sides  by  serpen¬ 
tine.  To  the  east,  at/,  schist  again  appears.  The  junction  between 
schist  and  serpentine  is  of  a  wavy  character,  tongues  of  the  latter 
run  out  into  the  former,  and  the  patch  e  might  be  taken  for  an 
inclusion,  so  that  at  first  glance  the  hypothesis  of  an  intrusion  of 
serpentine  into  schist  seems  a  perfectly  natural  one.  Careful 
examination  shows,  however,  that  the  patch  e  is  not  an  enclosure, 
but  the  summit  of  a  gentle  dome  which  has  been  exposed  by  the 
removal  of  the  once  overlying  band  of  serpentine  ;  and,  further,  that 
the  wavy  character  of  the  junction  is  the  result  of  folding,  so  that 
