238 STATIIER : NOTES ON EAST YORKSHIRE liOULDERS. 
Table I. 
BouLDKRs Twelve Inches 
AND Ul'WARDS IN DiAMETEK. 
Out 
Newton 
(J Mile of 
Cliff). ' 
Tnnstall 
(1 Mile of 
Cliff). 
Aldbrough 
(7 MUe of 
Cliff). ' 
Mappleton 
m Miles 
of Cliff.. 
Origin. 
Per cent. 
Per cent. 
Per cent. 
Per cent. 
Rocks foreign East 
to East Yorkshire 
Yorkshire. Rocks. 
Lias... 
Chalk 
Other Mesozoic rocks, 
chiefly sandstones ... 
Carboniferous limestone . . . 
Sandstones, grits, <fec., 
chiefly from Carbon- 
iferous sources 
Basalts 
Granites, gneiss, schists, 
&c 
5-6 
1-9 
3-7 
37-8 
12-4 
28-8 
9*8 
100-0 
13-9 
2-9 
1-8 
37-6 
17-9 
23-4 
2o 
14-7 
9-7 
3-2 
23-9 
10-3 
34-6 
3-6 
16-0 
12 0 
8-0 
24-0 
20-9 
16-0 
31 
100-0 
100-0 
100-0 
Actual number of boulders 
noted ... 
267 
274 
824 
2-2") 
From the above table it will be seen that the boulders of 
East Y'orkshire can be divided into two well-defined groups ; the 
first division consisting of rocks from comparatively local sources, 
and the second division comprising rocks from more distant 
localities. 
(1) LOCAL ROCKS. The coast of Yorksliire north of Brid- 
lington presents continuous sections of the Jurassic and Cretaceous 
strata, and, as might be expected, these rocks are largely repre- 
sented in the glacial beds to the soutliward. 
Lias. In south Holderness hard nodular concretions from 
this formation are plentiful, but large boulders of the softer 
shales, so characteristic of the lower part of the drift in other 
places, are rare. Further north, in Filey Bay, between Primrose 
Yalley and Hunmanby Gap, many masses of Lias shale occur 
embedded in boulder-clay, both in the cliffs and on the fore- 
shore, and were formerly mistaken for Kimmeridge clay in place. 
Several of the masses in the base of the cliffs are from the 
