SOILS AND AGRICULTURE OF NORFOLK. 
369 
of soil. Although the outcrop is so narrow — about six 
miles across at the widest — the difference between the 
soils formed from the upper and lower strata is well 
shown by their relative fertility. The upper part of the 
formation (eastern side) weathers down to a light red sandy 
soil, the colour being due to the presence of iron in con- 
siderable quantities, and which, carried down in solution, 
assists in cementing together the sandy particles to form the 
Table VI. 
Mechanical analysis of some Chalk Soils : — 
Fraction. 
Drayton. 
Morston. 
Stiffkey. 
Sedgeford. 
Soil— 
Stones 
1415 
20-37 
10-00 
2390 
Fine gravel 
3-00 
3-23 
4-60 
1-92 
Coarse sand 
45-60 
51-35 
25-25 
46-00 
Fine sand 
18-75 
24 75 
15-44 
22-67 
Coarse silt 
4-80 
4-05 
9T4 
3-90 
Fine silt 
5-30 
4-40 
8-50 
5-07 
Clay 
1-40 
3-37 
TOO 
3-65 
Moisture, organic matter 
and loss on ignition . . 
8-60 
5-61 
12-43 
735 
Subsoil — 
Stones 
14-28 
25-89 
10-00 
16-15 
Fine gravel 
3-50 
4-00 
6-50 
1-40 
Coarse sand 
3645 
49-30 
8-55 
51-40 
Fine sand 
13-90 
28-30 
7-75 
23-62 
Coarse silt 
4-90 
6-04 
6-15 
55 
Fine silt 
8-80 
5-56 
11-51 
4-45 
Clay 
1-00 
4-25 
2-95 
4-40 
Moisture, organic matter 
and loss on ignition . . 
7-46 
4-51 
99 
6-08 
