409 
PETROLOGICAL NOTES ON SOME OF THE LARGER BOULDERS ON THE BEACH 
SOUTH OF FLAMBOROUGH HEAD. BY ALFRED HARKER, M.A., F.G.S. 
In undertaking to examine the rocks chosen by Mr. Lamplugh 
from his large collection of boulders, my desire was not so much to 
form a general opinion on the question of their probable sources, as 
to identify, among the numerous boulders, a few of which the original 
locaHties could be fixed with certainty. This hope has been to a great 
extent frustrated by the discovery that a large proportion of those 
igneous boulders wliicli I examined, have, in all probability, been 
brought from Norway. 
The bulk of the specimens selected and submitted to me consist 
of granitic, gneissic, and other crystaUine rocks, such as might have 
been derived, so far as their individual characters are concerned, 
either from Scandinavia or from the Scottish Highlands. Among 
them are some undoubted Norwegian rocks, while none can be 
pointed out as certainly brought from Scotland. It may well be, 
then, that the whole of the doubtful rocks are also of Norwegian 
origin, and this is rendered probable by other evidence as to the 
movements of the ice and the consequent directions of transport. 
Such rocks, however, in endless variety, cover the greater part of 
Norway, and although many of them have been described by Mohl, 
IJrcgger, Reusch, and others, our data are far from sufficient for our 
purpose. 
Nevertheless, I propose to note the characters of one or two 
rocks which can be referred, without hesitation, to Norwegian 
localities, and a few specimens illustrating the varied characters of 
the rest, besides some boulders which can be identified as of 
British origin. 
In addition to Mr. Lamplugh's numbers, I give in brackets [ ] 
references to slides in the cabinet of the Woodwardian Museum. A 
few of these were prepared from specimens collected before ^h. 
Lamplugh's systematic examination of the ground was undertaken, 
and for these P am not able to give the corresponding numbers in 
his catalogue. 
F 
