STATHER : NOTES OX EAST YORKSHIRE BOULDERS. 
243 
increase both in number and variety southwards, and that among 
them are certain Scandinavian types which are known to be 
much more plentiful in the south of the county than in the 
north, I think it may be fairly inferred that the unidentified 
rocks of the group are probably largely from Scandinavia also. 
SMALLER BOULDERS, PEBBLES, AND fJRAVELS. 
Up to the present we are not in possession of even a rough 
analysis of the smaller boulders and gravels of the East York- 
shire drifts ; but the few notes that liave been made are of 
great interest and suggest a profitable field for further investi- 
gation. Among the smaller stones and pebbles we find derived 
fossils of wide range. Carboniferous corals being particularly 
conspicuous. From the Secondary rocks lias fossils are perhaps 
the most common, though in Holderness specimens from the 
Speeton clay and Chalk are not rare. North of Flamborough 
Head, fossils and pebbles from the Cretaceous rocks though rare 
are not unknown, and the writer has seen striated pebbles of 
hard chalk (six inches in diameter) in the glacial clays at Seal by 
Mills, two miles north of Scarborough, and smaller pebbles of 
the same character as far north as Kettleness. It has also long 
been known that tlie East Yorkshire boulder-clays, both north 
and south of Flamborough Head, contain large numbers of black, 
pink, and green-coated flints, w^hich cannot be matched from 
Yorksliire rocks in situ. In addition to this, a well-preserved 
Upper Cretaceous belemnite, which Mr. Jukes-Brown recognises 
as Belemnitella lanceolata, is frequently found in tlie Holderness 
drifts, yet is unknown to collectors from the Yorkshire Chalk. 
On the other hand, llelemnitella quadrata^ which is common in 
the Upper Chalk of Yorkshire and Flamborough Head, has not 
yet been noted in tlie Holderness clays, though sought with 
care. 
It is also worthy of note that among tlie smaller boulders 
and pebbles from the boulder -clays and gravels of East York- 
shire the percentage of the far-travelled rocks is much higher 
than among the larger boulders. There are certain types also 
