Geoscience Reference
In-Depth Information
cords well the broad movement pattern that developed after the main bedrock succes-
sion had formed, and explains the distribution of hills and downs on the one hand, and
basins on the other. The large northern areas of Chalk that form Salisbury Plain, the
Hampshire Downs and the South Downs are replaced southwards by the Early Tertiary
sediments that fill the Hampshire Basin. South of these sediments, the Chalk reappears
at the surface in the Portsdown Ridge, and in the northward-facing stepfold (mono-
cline) that extends across the Isle of Wight and South Purbeck (Figs 116 and 117).
As Figure 116 shows, I have divided this Area into seven Landscapes (
A
to
G
),
which are treated separately below.
FIG
115.
Generalised bedrock succession for Area 5.
