430 
HESSES.  P.  LAE.E  AHD  T.  T.  GE003I  OH  THE 
[Aug.  1893, 
steeply  towards  the  south,  and  the  dip  of  the  slates  above  is  the 
same/  But  the  dip  of  these  slates  soon  changes  and  becomes 
northerly,  and,  as  the  section  in  Kant  Cawrddu  shows,  that  of  the 
grit  does  the  same.  A  fault,  however,  intervenes  before  the  grit 
can  come  to  the  surface  ;  and  south  of  this  fault  the  grit  reappears, 
forming  a  second  synclinal,  in  which  lies  the  old  reservoir  ol'  the 
Corwen  Waterworks  (fig.  2). 
Pig.  1. — Section  in  Nant  Llechog . 
y.  17°  e.  S.  17°  W. 
Horizontal  scale  :  12  inches  =1  mile.  Vertical  scale  :  1  inch  —400  feet. 
a  =  Bala  Beds.  c  =  Grey  Slates. 
b  =  Corwen  Grit.  F=  Fault. 
3.  Country  North  of  the  Main  Grit-band.— Since  the  grit  forms  the 
crest  of  the  valley-bank  and  dips  towards  the  south,  the  whole  of 
the  bank  below  would  be  formed  of  Bala  Beds,  were  it  not  that 
about  half-way  down  a  long  fault  runs  along  the  side  of  the  valley 
from  10°  K.  of  W.  to  10°  S.  of  E.  This  fault  throws  towards  the 
Fig.  2. — Section  from  the  Church  to  the  old  Corwen  Waterworks. 
Water¬ 
loo  w  work  S.  15°  E. 
Horizontal  scale:  9  inches  =1  mile.  Vertical  scale  :  1  inch  — 00O  feet. 
[For  explanation  of  lettering,  see  fig.  1.] 
north,  and  on  its  northern  side  the  beds  dip  at  an  angle  of  about  12° 
towards  the  north. 
Kear  Corwen  this  fault  brings  in  several  patches  of  grit,  one  of 
which  may  be  seen  in  the  quarry  already  mentioned  and  is  shown 
at  the  northern  end  of  the  section  in  fig.  2.  Other  small  patches 
are  found  in  the  woods  to  the  east.  Farther  still  towards  the  east 
the  grit  let  down  by  this  fault  forms  for  a  little  distance  the  bed  of 
