136 
CHILLESrORD CLAY. 
Turning westward, up the valley of the Waveney, we find 
undoubted sections of Chillesford Clay at Aldeby, and what is 
probably a sandy modification of the same deposit on the opposite 
side of the river, close to Beccles. The Aldeby sections have 
already been described (pp. 108, 109). Those on the soutii side of 
the valley are interesting inasmuch as they show an alternation of 
laminated loams, sands, and seams of pebbles, as though the 
Chillesford Clay passes not only downward into the Crag, but 
upward by alternation into the Pebble Gravel—as is perhaps 
the case in other areas also. 
The most characteristic of the sections near Beccles—and the 
only one that really justifies the mapping of the deposit as 
Chillesford Clay—is at In gate Clay Pit, half a mile east of the 
town, where we find the following section:— 
Feet. 
Soil (sandy) 2 
Pebbly sand -------3 
Loamy Chillesford Clay, upper part brown, lower blue and"] 
stiffen ; a good many thin ferruginous seams occur, which I 
have to be separated before it is used for bricks ; there is [ 
also too much sand, which also lowers its value - - J 
Hard pan and sand. 
For half a mile further east the outcrop of this clay has been 
traced on the Map; but to the west of Beccles the deposits are 
much more sandy, and though probably of the same age, cannot 
be mapped as clays. 
About seven miles north of Aldeby micaceous clays of the 
ordinary character reappear at Reedham and Limpenhoe, and Mr. 
Blake has been able to follow the outcrop for some distance at 
each place. One of the sections at Reedham, three-eighths of a 
mile east of the station, is described as showing a thickness of 
11 feet of these laminated clays and sands, the pebble gravel 
resting on a distinctly eroded surface of the clay.* 
Four miles west-north-west of Limpenhoe we find the sections 
at Surlingham, already described (p- 126). These lead us to the 
Norwich district, over which the clay is too thin and impersistent 
to be separated from the umlerlying shelly Crag. 
In the Bure Valley the deposit reappears at Wroxham (p. 128), 
where it reaches a thickness of 18 feet, and at South Walsham. 
Masses of similar clay are seen at several other points, but these 
are the only ones that can be mapped. At both Wroxham and 
South Walsham the clay appears to be thickening, and at the 
same time sinking beneath the marsh level. Thus it happens that 
between the Bure Valley and the coast—a distance of nine miles— 
only exposures of the overlying Pebbly Gravels are visible; 
though shelly Crag, of the age of the Weybourn Crag or perhaps 
newer, was met with in the railway-cutting south-east of Black 
* Geology of the Country around Norwich {Memoirs of the Geological Survey'), 
pp. 78, 79. 
