366 
SOILS AND AGRICULTURE OF NORFOLK. 
Table III. 
Chemical analysis of some Gault Soils : — 
Wretton. 
Gayton. 
Moisture . . 
2 23 
430 
Organic and loss on ignition 
5-62 
11-95 
Nitrogen . . 
T82 
•2 
Potash 
•355 
•708 
Phosphorus pentoxide 
132 
•294 
Calcium and magnesium 
carbonates 
•80 
23-80 
Insoluble residues 
82-52 
45-97 
Gault Soils. — The gault gives rise to only a very small 
part of the surface of the county, about 4,000 acres in all, and it 
oocurs in two small outcrops situated some six miles east of 
King’s Lynn and Downham Market respectively. 
Gault soils are usually spoken of as “ heavy clays,” apd 
where a considerable area of derived soil is found this 
definition is generally true, but in the case of a narrow out- 
crop such as is seen in Norfolk, a certain amount of admixture 
with adjacent beds is sure to have taken place and the top 6 
inches must be altered in texture. 
The soils shown in Tables II. and III. indicate very well 
the tremendous differences met with in soils of the same 
geological horizon and in the same locality. The enormous 
difference in the percentage of chalk is due to the fact that the 
gault passes into the chalk gradually, and so the intermediate 
beds consist of clay and chalk in varying proportions. Samples 
of gault soils in other parts of East Anglia derived from the 
lower part of the stratum are almost entirely free from chalk. 
Neither of the analysis given in the tables are typical of 
the gault — the outcrops in Norfolk are so small that there is 
always some admixture of other formations. 
