200 
DEPOSITS OF DOUBTFUL AGE. 
As they rise to a height of 30 feet above the sea, they can be 
well examined. At Hedenham they consist of greenish-grey 
pebbly sand, exposed to a depth of five feet. More than half 
the pebbles are foreign to the district, principally quartz, and a 
large number of quartzite. At Woodton were found fine false- 
bedded pebbly gravel and sand, in the lower part of which was a 
good deal of greenish clay. About half the pebbles were of 
flint, the rest consisted of hard sandstone, quartz, and quartzite. 
One pebble of Hertfordshire pudding-stone was noticed. This 
correspondence in composition between the gravels at Woodton 
and those in the Forest-bed at Bacton is worthy of notice, 
especially as in the intervening area they are to a much larger 
extent of local origin. Ts it possible that we ai'e really dealing 
with two distinct horizons, and that the Woodton gravels are 
truly of the age of the Forest-bed, whilst the shingle at Beedham 
is of later date ? The occurrence of the peculiar light-coloured 
fine-grained quartzite so abundant in the Forest-bed is, however, 
insufficient to prove that the Woodton gravel is of Forest-bed 
age. Similar quartzite pebbles are found rarely throughout the 
Upper Pliocene series in Norfolk, and are merely more abundant 
in the estuarine gravels than in the marine ones. Some large 
pebbles were found in the shingly Norwich Crag at Ditchingham 
(see.p. 111). 
Higher up the Waveney Valley somewhat similar deposits have 
been mapped by Mr. Dalton in the neighbourhood of Withers- 
dale. The beds have here become more loamy and sandy.* A 
section in Withersdale brickyard showed 25 feet of laminated 
loams, alternating with pebble gravel, resting on rather loamy 
sands. South of the Waveney Valley, little difficulty has been 
felt in separating the pebble gravel from the Crag. It is there¬ 
fore shown on the Geological Survey Map as a distinct division, 
coloured differently. 
Eeturning to the coast, we find no deposits older than the 
lower Boulder Clay for several miles south of Happisburgh. 
Near Hopton, north of Lowestoft, the Bootlet-bed again rises 
above the sea-level, but is cut off above by Boulder Clay, Not 
many yards further a series of pebbly sands comes in between the 
Boulder Clay and the Rootlet-bed. These sands can be traced con¬ 
tinuously nearly to Corton Gap, near which place Boulder Clay 
again ploughs through the bed. Mr. Blake describes the “ Pebbly 
Series in these cliffs as consisting of ‘‘ buff and ash-coloured 
pebbly sands, containing patches of clay and ferruginous con¬ 
cretions, laminated or well-stratifieii grey and brown clay, and 
ferruginous gravel and sand pan particularly at its base, 
where also a little ochreous-coloured clay occasionally occurs 
overlying the black peat. No fossils have been observed in any 
portion of this deposit at Corton.^f 
* See Geology of Halesworth and Harleston. {Mem. Geol. Survey), pp. 15, 16. 
f Horizontal Sections, Sheet 128. {Geological Survey) ; and Explanation 8vo. p. 6. 
See also Geology pf the country near Yarmouth and Lowestoft. (Mem. Geol. 
Survey.) 
