46 
NE. 
To Flamborough Head. 
Toe 0ag CORDS I BIGE 
2 Ea0C 0000 [Fa 
ao 
NEN SG, 
S.W. 
Bridlington town. 
Ni 
SPV IN ENS 
Ved: 
Ze 
Correspondence— The Bridlington Craq. 
NEN alos 
ia 
~ \ 
Zeer 
ERNE, 
=i 
A aS 
SASHES 
== 
AX. 
\ 
Nt 
SS 
Sie 
Soma 
FASS 
eee 
Beach-line. 
b 
Section at Bridlington (length about 10 furlongs), 
db. Base of Boulder-clay, consisting of a black clay, with abundant small chalk-detritus ; 10 feet. 
Chalk. 
c. Purplish black clay, with occasional stones, being the ordinary Boulder-clay of the coast of South Yorkshire ; 80 feet where thickest in section. 
a. 
e. White chalky marl, in deep indentations in d. 
d. Ferruginous gravel ; from 6 to 15 feet. 
CORRESPONDENCE. 
———~—— 
THE BRIDLINGTON CRAG. 
To the Editors of the GEOLOGICAL 
MAGAZINE. 
As your correspondents from Brid- 
lington have not furnished you with any 
explanation of the geological position of 
the so-called ‘Crag’ of that place,* I 
send you a section, taken by me during 
the early part of the present summer. 
It will be seen that about a mile north 
of the town, the base of the Boulder- 
clay (or Upper Drift) is brought up by 
an abrupt upheaval of the Chalk, upon 
which the clay rests. This clay (form- 
ing, with its capping deposits, the whole 
of the Holderness country) dips towards 
Bridlington Harbour; and there the 
gravel and overlying marl come down 
to the beach. The base of the Boulder- 
clay, where brought up, consists of a bed 
of dark clay, abounding in small chalk- 
detritus; but, so far as I could detect, 
it yields no fossils, and has nothing 
whatever like ‘ Crag,’ or any sandy bed, 
underlying it. The section is interest- 
ing in many respects; amongst others, 
in showing the disturbances on this part 
of the Yorkshire coast to have begun 
subsequently to the deposition of the 
Boulder-clay (c), and prior to the over- 
spread of the gravel (d); and to have 
been renewed after the deposition of the 
white marl (e), resting upon it, a deposit 
probably identical with those described 
by Phillips as yielding fresh-water re- 
mains at various points on this coast. A 
sand or gravel is shown by borings to 
be present under the clay further to the 
south, extending from Hull eastwards 
along the Hull and Withernsea Railway 
to the sea. That bed, however, I re- 
gard as indicating the occurrence, at 
this part of Yorkshire, of the upper 
series of the Lower Drift, which covers 
* See Gronocican Magazin, No. 2. 
