OF NORFOLK AND SUFFOLK. 119 
Only one possible source can be suggested for this enormous 
mass of detritus ; the Fenland, near at hand, where the 
Kimeridge clay is in situ, was the quarry from which it was 
dug, the accumulation of material in the one region, being 
the measure of its removal from the other. 
The transference of Kimeridge clay from the low-lying 
Fenland to high Suffolk is inconsistent with the floating ice 
theory. A subsidence sufficient to carry an ice floe over the 
latter district would have submerged the parent rock too 
deeply to allow for its excavation by the ice. 
While thus the boulder- clay of the region lying to the 
south of the line E F on the contour map is blue and intensely 
Kimeridgian, corresponding with the dark Jurassic drift of 
the basin of the river Witham, that to the north of the 
same line is whitish or grey, representing, it appears, 
the intensely Chalky boulder-clay of Horncastle. The 
transition from the one to the other is abrupt in Norfolk, 
as it is in Lincolnshire ; the clearly marked division between 
them can be usually traced, even in the absence of sections. 
The Kimeridgian boulder-clay forms much heavier land, 
especially in Suffolk. 
Unfortunately most of the pits which were open when 
I was mapping the country are now closed, either grown up, 
or filled with water ; there are still a few, however, where the 
relation of these deposits to each other may be studied. 
To the left of the road from Loddon to Haddiscoe, for example, 
there are at present two clear sections of the white Chalky 
boulder-clay, one at Raveningham, the other half a mile 
north-west of Haddiscoe Church. 
These may be taken as typical of this kind of drift over the 
area shown on the map between the lines A C and E F ; 
it maintains a similar character throughout, except that 
in some parts it is more clayey than in others. A short 
distance east of Haddiscoe, on the opposite side of the river 
Waveney, the boulder-clay is, on the contrary, blue and 
Kimeridgian ; this is shown at a section in the disused 
cement works behind Burgh Castle, in a large pit half a mile 
west of Lound Church, at the brickyards at Somerleyton, 
