PEBBLE GRAVELS. 
201 
Similar pebbly sands reappear in the Pakefieldand Kessingland 
Cliffs, resting sometimes on the Forest-bed, sometimes on Chilles- 
ford Clay. Owing to the absence of any intervening Lower 
Boulder Clay, this series is not very distinctly separated from 
the Middle Glacial Sands, though the line of junction can usually 
be traced. The lithological character of the sands is the same as 
at Corton, except that now they contain derivative pebbles of the 
underlying Chillesford Clay. 
We now enter the district taken by Prof. Prestwich as the 
typical area for his “Westleton Sands and Shingle,” a name 
afterwards changed to ‘‘Mundesley and Westleton Beds.””^ The 
latter term it is impossible to adopt, for there is no evidence that 
the strata at Westleton are connected with those at Mundesley. 
On the Norfolk coast Prof Prestwich’s group includes part of 
the Weybourn Crag, part of the Forest-bed, the Lcda-myalis 
Bed, and the Arctic Freshwater Bed—a collection of zones which 
have nothing to do with each other, and do not even form a con¬ 
tinuous series. The Forest-bed, though placed by Prof Prestwich 
below his Mundesley Beds, is really in the middle of this group, 
many of his illustrations being taken from the estuarine division. 
The name ^‘Westleton Beds” might possibly be useful for the 
deposits immediately around Westleton and Southwold, for these 
most probably belong to one series. In the absence of any clear 
stratigraphical continuity of the deposits, and of any charac¬ 
teristic fossils, we cannot, however, use the name in any more 
extended sense. In this Memoir I have followed Mr. Whitaker 
in using the indefinite term “ Pebbly Series ” for the large 
residuum which remains, after all deposits of determinable age 
have been separated. The following description of this area is 
mainly condensed from the Memoirs by Mr. Whitaker, who 
surveyed the district.! We will commence with the cliff at 
Covehithe and trace the sections southward. 
In Covehithe cliff pebbly gravel and sand reappear. They rest 
on Chillesford Clay, in places with a fairly even junction, in others 
irregularly. No shells have yet been found here. The Easton 
Bavent cliff shows the Pebbly Series gradually cutting through 
the clay towards the south, but at the same time resting on it 
with amore even junction. At Southwold the Chillesford Clay 
has entirely disappeared, so that there is considerable difficulty 
in separating the Pebbly Series from the underlying shelly Crag. 
This is one of the few localities where fossils have been recorded 
from the Pebbly Series. There seems, however, to be considerable 
doubt whether the shelly beds do not belong rather to the under¬ 
lying Crag. The localities where fossils occur will therefore be 
described fully. The most northerly section is shown in Fig. 47, 
from the Southwold Memoir. 
* Quart. Journ. Geol. Soc., vol. xxvii., pp. 461-463 (1871) ; and liep. Brit. 
ylssoc. for 1881, p. 620, Geol. Mag. dec. II., vol. viii., p. 466 (1881). See also 
Memoirs Geol. Survey on Norwich, Cromer, and Southwold. 
t See Geology of Southwold and the Suffolk Coast (1887); Geology of Hales- 
worth and Harleston (1887). 
