lamplugh: the larger boulders of flambro' head. 341 
plentiful in that series ; and on the other hand whenever close search 
has resolved my doubts as to a block, the indications I have found have 
always gone to prove its age to be Carboniferous ; nor are there any 
Jurassic limestones among the limestones I have examined. Hence I 
think it probable that all these sandstone and limestone boulders have 
had one source, and that source the Carboniferous, and therefore that 
the proportion of Carboniferous rocks in the list may be reckoned at 
certainly not less than sixty and perhaps as high as eighty per cent, of 
the whole. Of the remainder of the list twelve per cent, are Basalts, 
some of which have no doubt also come from the dykes and sills of 
the Carboniferous ; and the remaining five boulders (6 "3 per cent.) 
are igneous rocks, whose origin, though unknown to me, might, I 
think, be determined by anyone who had studied their parent masses, 
since they are all possessed of very pronounced characteristics. 
It is curious, that though the area under consideration is sur- 
rounded on all sides by Secondaries to a minimum distance of sixty 
miles, I did not come across a single boulder of the requisite size which 
I could be certain had come from Secondary rocks (ignoring the 
masses of chalk in the lower glacial gTavels, which are scarcely detached 
from their parent rock), and that the whole of the boulders should 
be far-travelled. But it must be remembered that I am at present 
dealing only with the larger boulders of the drift, and that a con- 
sideration of the smaller stones might give quite different results. 
It may be, too, that as my work proceeds the relative proportion of 
the rocks will alter, so that for the present it will be safest to base 
no conclusions on these results. 
In the notes which follow are enumerated the more important 
boulders on the beach between Bridlington Quay and Danes Dyke 
selected from a List of Seventy-six. 
(The numeral indicates the ordinal position of the block in the 
original full list. The sign + indicates that the measurement 
after which it is placed is incomplete owing to the block not 
being fully exposed.) 
No. 
5. — Position : — Near the drain at Sands Cottage, embedded in 
Purple clay, four feet above the beach. Description : — Greenish 
calciferous sandstone, fossiliferous, — casts of shells. Age: — Car- 
