Ef 
Fig. 5. 
Fig. 6. 
map 7.(sheet 2) SLOPE/SOILS 
rials are outcropping on level ground as a result of the planing of the landscape 
during a Pleistocene erosion cycle, giving rise to a succession of three soil types 
whose existence and extent can be determined only by ground survey. 
With reference to land use - woods, heaths and parkland are rare on high 
quality agricultural soils i.e. level land with deep loamy welldrained soils, 
but may occur on a wide range of poorer soils. The 1 : 10,560 map scale is too 
large for the recognition of a distribution pattern. Woodland distribution merely 
provides evidence of varying value in support of that deduced from agriculture. 
Heaths usually indicate poor land, but their boundaries here result more from 
historical accident than from soil change. 
The Sheet 2 area consists of a section across the valley of the Thames. In the 
physiographical interpretation (fig. 5) the large areas of even slopes and the 
lack of geomorphological definition, at this map scale, led us to prepare a 
slope map instead of a map of land forms. The most convenient classification 
for this area comprised four slope classes: 1. level; 2. 2-4°; 3. 5-10° 4. 
over 10°. 
From fig. 6 it can be seen that land use in Sheet 2 is confined to farmland 
and woodland; woodland being subdivided on a tone difference. Farmland 
falls into two divisions, 1. permanent grass of the Thames floodplain - large 
map 6 .(sheet 2) LAND USE 
Fig. 7. 
Fig. 8. 
MAP 5.(SHEET 2) 
SLOPE 
SYMPOSIUM PHOTO INTERPRETATION, DELFT 1962