240 
stathkk: notks on east yohkshike uouldkks. 
At Witheriisea ... 3 per ( eiit. of the boulders are Chalk. 
„ Hollym 9 „ „ 
Holmptori ... ... 12 
„ Out Newton ... 2 ,, 
,, Dimlington . . 3 „ 
Easington ... ... 14 ,, 
„ Kilnsea ... .. 7 
Tliis inequality in the distribution of Chalk boulders at these 
different places along the Holderness coast probably arises from 
the fact (pointed out by Wood and Rome) that the lower - part 
of the glacial series of Holderness contains more Chalk than 
the upper, and that these basement beds with their higher per- 
centage of Chalk boulders rise only occasionally above sea level. 
(2) FAR-TRAVELLED BOULDERS. It will be scen from table 
No. 1 that, among the far-travelled boulders of the East York- 
shire drift deposits, Carbcjiiiferous rocks take numerically the 
leading position ; and the Carboniferous area west and north 
of the Tees is generally regarded as their place of origin. The 
group of boulders next in numerical importance to the fore- 
going is the basalts, the source of which is undoubtedly the 
Whin Sill. The next, and last, group is that of the granites, 
gneisses, Sic, comprising rocks of widely diversified types, in great 
variety. Phillips showed long ago that some of these came from 
the English Lake District, and we now know that there are also 
Cheviot and Scandinavian rocks among them ; but the sources of 
a large number of these rocks have yet to be determined. 
When the lists of boulders obtained in the south of York- 
shire are compared with the lists obtained in the north, they 
bring to light several interesting facts with regard to the far- 
travelled boulders. Compare, for instance, the lists obtained at 
Dimlington and Redcliff, in south Yorkshire, with the lists from 
Upgang and Saltburn in the north. Before, however, discussing 
the boulders it is advisable to give a brief description of the 
localities where the lists were compiled. 
(i.) Dimlington is situated on the sea -coast near the 
southern extremity of Holderness. The cliffs average about 
