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14 Yorkshire Boulder Committee : Its Twelfth Vear's Work. 
The Chairman (Mr. Kendall) spent a month during the 
summer of 1 in Norway between ° Christiania and Christian- 
sand collecting rocks for comparison with the erratics of the 
east coast of England. He brought away a large quantity of 
material illustrating important petrological types, and has now 
distributed about 300 specimens amongst English workers in 
glacial geology, to whom they may be useful. Other sets will 
be lodged in public museums. 
A series of east ‘coast erratic boulders collected by Mr. 
_ J. W. Stather, F.G.S., and Mr. Thomas Sheppard was taken to 
consented to examine them. Professor Brégger’s examination 
was not carried to completion, as the thin sections which should 
_ have accompanied the specimens had gone astray in the post, 
but some rocks were nevertheless singled out by him which 
possessed such marked characteristics as to admit of positive 
identification. 
These determinations are of so much interest and importance 
that it has been thought desirable to publish them in this report 
rather than to wait for a more complete statement. 
The well-known rhomb-porphyries yielded examples from 
the Ringerike, Tonsberg, and Tuft (in the Langendal) districts. 
Brégger found the pyroxenite of Fettvedt, Christianiafjord ; 
a soda syenite from the country north of Christiamia; a basic 
rock from Hitterdal (this is a very pronounced type regarding - 
which Professor Brégger spoke with great confidence); the 
Labradorite-porphyrite of Mos (on the east side of the Skager- 
rack south of Drobak), and rocks from the an, Sai an of 
Drammen 
In gadidan to these there are examples of Labradorite- _ 
porphyrite with porphyritic conspicuously-zoned felspars, which 
is known as an erratic in Norway, but has not been traced 
in situ. 
Finally Professor Brégger recognised three examples of the 
sandstone or grit representing the curious ‘ Sparagmit-con- 
glomerat,’ which covers a vast area in the high mountainous 
interior of Scandinavia northward of Christiania. The speci- 
mens in question may have come from Gudbransdal, about the 
northern part of Lake Mjésen. 
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~ Naturalist, 
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