294 LAMPLUGH : GLACIAL SECTIONS NEAR BRIDLINGTON. 
I have been greatly impressed by the effect which the cliffs of 
the northern side (abont 400 feet high) have had in diverting the 
ice-current. It is clear that during the greater part of the glacial 
period the ice in this locality, though it seems to have slightly over- 
topped these cliffs, was certainly not thick enough to over-ride them; 
consequently it is very improbable that the Wolds were ever covered, 
and indeed I think that I have accumulated sufficient evidence, to be 
made use of hereafter, to prove that they were not. 
Appendix A.^ 
list of shells from the basement boulder-clay, and its 
included masses of sand and clay at bridlington quay and 
flamborough south landing. 
JMOTE. — Shells marked thus f, mentioned in previous lists have not yet 
come under my own observation. The following signs indicate the relative 
abundance of the shells at Bridlington, v c, very common; c, common; 
r., rare; v.r., very rare. Species marked || occurred chiefly, if not solely, in the 
sandy seam near the third breakwater. Species not now living are distinguished 
by two asterisks, thus **. 
Brid- 
Flambro' 
lington 
South 
Brachiopoda. 
Quay. 
Landing. 
v.r. 
Rhynchonella psittacea, Chemnitz. 
* 
CONCHIFERA. 
c. 
Anemia ephippium, Lin. 
* 
c. 
var. aculeata 
* 
r. 
rar. squamula 
* 
c. 
Pecten islandicus, Miller. 
♦ 
* 
v.r. 
pes lutrae, L. 
II c. 
opercularis, L. 
* 
r. 
Mytilus edulis, L. 
II c. 
modiolus, L. 
* 
v.r. 
Crenella decussata, Mont. 
* 
v.r. 
Leda minuta, Miill. ... 
* 
v.r. 
var. buccata 
* 
v.r. 
Leda tenuis, Philippi ... 
* 
r. 
lenticula, Moll. 
* 
c. 
limatula, Say. 
? 
c. 
intermedia, M. Sars. 
* 
v.r. 
pernula, Miill. 
* 
c. 
Nucula Cobboldiae, Leathes 
r 
iNote. — The Bridlington list is based chiefly on the catalogues given 
by Dr. J. Gwyn Jeffreys in Phillip's Geol. of Yorksh.. 3rd ed., p. 274, and in 
the appendix to my paper in Quart. Journ. Geol. Soc. xl., p. 319; and by 
Clement Reid in Survey Mem. " Holderness," p. 23. 
