22 0  DISCUSSION COAST-SECTIONS  AT  THE  LIZARD,  ETC.  [May  1 893, 
Llandeilo  Beds  had  been  deposited  in  comparatively  deep  water. 
His  conclusions,  however,  were  then  severely  attacked  by  the  late 
Sir  Andrew  Ramsay  and  others  ;  but  evidence  was  now  accumu¬ 
lating  to  show  that  they  were  correct. 
Dr.  Hinde  also  spoke. 
Mr.  Teall  did  not  think  that  a  determination  of  the  age  of  the 
Mullion  Island  sediments  would  throw  any  light  on  that  of  the 
crystalline  schists  of  the  Lizard.  The  main  object  of  the  first  paper 
was  to  show  that  certain  hornblende-schists  were  interbanded  with 
foliated  serpentine.  It  must  be  remembered,  however,  that  the 
hornblende-schists  of  the  Lizard  were  certainly  not  all  of  the  same 
age.  Some  of  the  foliated  portions  of  the  dykes  in  the  area  under 
consideration  bore  the  closest  resemblance  to  parts  of  the  horn¬ 
blende-schist  of  the  South. 
He  agreed  with  Prof.  Bonney  that  there  were  intrusive  peridotites, 
hut  he  thought  there  were  others  which  formed  integral  portions  of 
gneissose  formations.  He  commented  on  certain  points  of  resem¬ 
blance  between  the  Lizard  District  and  the  North-west  of  Scot¬ 
land.  In  both  there  were  foliated  crystalline  rocks  cut  by  basic 
dykes,  and  in  both  these  later  dykes  passed  into  schists.  He  thanked 
the  speakers  for  the  kind  way  in  which  they  had  received  the  papers. 
Mr.  Howard  Pox  said  it  would  be  gratifying  if  the  discovery  of 
the  Mullion  Island  radiolarian  cherts  led  to  that  of  other  beds  in 
England  and  Wales.  Some  of  the  less  accessible  points  and  out¬ 
lying  rocks  in  Cornwall  had  yet  to  be  examined.  Prof.  Bonney  had 
kindly  informed  him  that  west  of  Conway  marine  mud  was  seen  to 
be  partly  caught  up  by  Bala  lava  as  the  Mullion  Island  chert  and 
shales  appeared  to  have  been,  and  south  of  Clermont  Eerrand  Prof. 
Bonney  had  seen  a  lava-stream  with  many  large  lumps  of  marl 
picked  up  by  it.  The  interest  of  their  second  paper  was  largely 
enhanced  by  Dr.  Hinde’s  most  valuable  note. 
