318 G. W. LAMPLUGH ON SHELLY PATCHES IN THE 
and other gravels, are not uncommon in the Basement-clay *, one, 
a patch of Lower-Lias shale observed by Phillips, occurring on the 
beach within fifty yards of the exposure I have been describing. 
The great similarity between the general aspect of the masses in 
localities so far apart as Bridlington and Dimlington ; their eyver- 
varying lithological character ; their composition (which renders it 
improbable that they have been formed from the waste of rocks in 
the neighbourhood) ; the composition of the Boulder-clay in which 
they are enclosed, which is strikingly unlocal, its very flints being 
such as do not occur in Yorkshire Chalk: the marine débris so 
plentifully dispersed in the Boulder-clay; all bear in the same 
direction and point to the probability of the masses haying per- 
formed no insignificant journey. 
Whence came they? Certainly, I should say, from seaward ; 
probably, judging from their pebbles and boulders, from the north- 
east. 
Beyond this, having only a limited and local knowledge of glacial 
geology, I have no right to express an opinion ; but I may remark 
that to me there seems no reason why portions of a sea-bottom 
caught up into the base of an advancing glacier should not be carried 
by detached bergs till stranded on opposite and far-distant shores, 
and that the position and condition of Holderness prior to the de- 
position of the drifts, a shallow wide-mouthed bay, well sheltered 
by the curving Chalk Wolds, might well favour the driftimg and 
stranding of such bergs. 
Enough has been said to show that the mere presence of these 
arctic shells at Bridlington is not, under the circumstances, in itself 
necessarily a proof that the shells once lived there, or that con- 
ditions necessary to their growth existed on the spot at the time of 
their deposition. 
Having drawn attention to the deposit, I trust that some future 
worker with greater leisure will devote his attention to the subject ; 
for the masses will, I feel assured, amply repay the time spent in 
examining them, especially at Dimlington, where the conditions are 
far more favourable for their study than at Bridlington; and I only 
regret that the distance of that place from Bridlington makes it 
practically inaccessible to me. 
There now only remains to me the pleasant duty of thanking the 
gentlemen by whose aid alone it has been possible for me to take 
advantage of so rare and favourable an opportunity of investigating 
the character of this interesting deposit. My thanks are especially 
due to Dr. Gwyn Jeffreys, F.R.S., for the kind assistance he has ~ 
given me in examining and determining the very large number of 
shells which I have from time to time sent him; to Dr. Crosskey 
for so willingly undertaking the examination of the microscopic 
fossils of the deposit; to Mr. E. T. Newton for his kind determina- 
tions of and notes on the fish-remains, and to Mr. W. B. Headley, 
without whose laborious work in collecting, this paper would have 
been unnecessary and valueless. 
* See my letter in Geol. Mag. Aug. 1882 for account of these. 
