SOILS AND AGRICULTURE OP NORFOLK. 
367 
The Wretton soil contains much more sand than is usual 
in gault and but little chalk. The sand is probably derived 
from a very thin coat of gravel. This makes the soil 
much more friable or “ easily worked ” Pure gault, consist- 
ing largely of the small clay particles with no chalk to cement 
them together, is exceedingly difficult to work as rain causes 
it to run together making a sticky surface from which rain 
runs as off a macintosh, and the water in the soil is unable 
to pass either up or down amongst the closely packed particles. 
Table IV. 
Mechanical analysis of some Greensand Soils : — 
West 
Dereham. 
Dersing- 
ham. 
Heacham. 
Soil— 
Stones 
3-90 
4-40 
3-30 
Fine gravel 
344 
1-75 
4-00 
Coarse sand 
61-80 
4195 
5073 
Fine sand 
16-00 
34-47 
11-08 
Coarse silt 
2-85 
3.27 
3-95 
Fine silt 
3-90 
5-83 
7-20 
Clay 
5 '45 
4-50 
9-90 
Moisture, organic matter 
and loss on ignition . . 
5-25 
6-65 
10-50 
Subsoil — 
Stones 
4-50 
2-20 
o-oo 
Fine gravel 
375 
5-39 
760 
Coarse sand 
66.40 
41-84 
44-60 
Fine sand 
13-78 
30-95 
10-04 
Coarse silt 
5 45 
5-75 
4-27 
Fine silt 
1-84 
1-63 
5-47 
Clay 
415 
5-38 
9-42 
Moisture, organic matter 
and loss on ignition . . 
395 
6-43 
10-95 
