Yol.  49.] 
BOULDEES  AT  CEOMEE. 
115 
east  of  the  former  place.  Herr  Eugene  Svedmark,  of  the  Swedish 
Geological  Survey,  to  whom  I  showed  it,  declared  that  it  corre¬ 
sponded  with  the  most  commonly  occurring  porphyries  of  Dalarne, 
as,  for  example,  with  the  4  porphyry  ’  from  Gronklitt  in  Orsa-socken 
(a  parish  in  Dalarne).  The  boulder  measures  about  2J  x  \  X  J 
inch. 
The  other  is  a  quartz-porphyry  with  greyish-black,  felsitic  ground- 
mass,  in  which  are  disseminated  several  small,  sharp-edged,  trans¬ 
parent  quartz-crystals  (diameter  *02-- 01  inch)  and  reddish  felspar- 
crystals,  the  largest  of  which  is  J  inch  long  and  Ag-  inch  broad,  but 
the  greater  number  of  the  felspars  measure  only  Ag-  inch  in  every 
dimension.  The  appearance  of  the  rock  is  fresh.  The  boulder 
measures  about  2|  X  |  X  1  inch;  it  also  was  taken  out  of  Boulder- 
Clay  one  mile  south-east  of  Cromer,  between  that  place  and 
Overstrand,  by  Mr.  A.  Savin.  Herr  Eugene  Svedmark  considered 
that  it  might  be  a  felsitic- porphyry  from  Dalarne. 
It  being  thus  demonstrated  that  boulders  of  certainly  Scandinavian 
origin  are  to  be  found  at  Cromer,  the  probability  arises  that  a 
considerable  number  of  the  granitic  and  gneissic  boulders  which 
occur  in  that  district  have  come  from  Scandinavia,  even  if  they  are 
not  characteristic  enough  to  be  referred  to  definite  localities  in 
the  Scandinavian  area. 
Discussion. 
Mr.  Clement  Beid  observed  that  characteristic  Scandinavian 
rocks,  such  as  the  4  Rhomben-porphyr  ’  from  the  neighbourhood  of 
Christiania,  certainly  were  found  as  erratics  on  the  coast  near 
Cromer.  The  absence  of  the  specimens  described  by  Herr  Madsen 
made  it  impossible,  however,  to  test  the  accuracy  of  the  new 
identifications. 
Mr.  J.  W.  Davis  remarked  that  the  Glacial  beds  of  the  East 
Riding  of  Yorkshire  and  those  of  Norfolk  were  similar  in  character, 
and  there  was  no  doubt  that  many  of  the  contained  boulders  had 
been  derived  from  the  region  now  covered  by  the  Baltic  Sea  and 
Scandinavia.  Three  years  ago  Mr.  Alfred  Harker  described  a  series 
of  typical  rocks  from  the  East  Riding  in  the  4  Proceedings  ?  of  the 
Yorkshire  Geological  Society,  and  had  identified  a  fair  proportion 
as  being  of  Scandinavian  derivation.  The  highly  glaciated  surface, 
not  only  of  Sweden  and  Norway,  but  of  the  numerous  islands  of  the 
Baltic,  was  undoubtedly  the  source  from  which  vast  quantities  of 
boulders  were  derived  which  had  been  shown  by  Dr.  Torell  to  have 
been  spread  over  the  plains  of  Northern  Germany,  the  German 
Ocean,  and  the  Eastern  part  of  England. 
The  Rev.  P.  B.  Beodie  said  that  he  had  collected  various  rocks 
from  the  Drift  in  Warwickshire,  and,  though  he  was  not  a  petro- 
logist,  it  had  occurred  to  him  that  some  might  have  come  from 
Norway  or  Sweden. 
Dr.  Hicks  said  that  when  Dr.  Torell  visited  Einchley  with  him 
some  years  ago,  several  boulders  obtained  from  the  Drift  there  were 
recognized  by  Dr.  Torell  as  being  identical  with  Scandinavian  rocks  ; 
