Transcript The South Downs Escarpment

THE SOUTH DOWNS
ESCARPMENT
Where is the South Downs Escarpment?
Map copyright Ordnance Survey
The area referred to in this presentation is here
Physical Features on O.S. Map
Clay Vale
Springs
Scarp slope
Escarpment
Dip slope
Dry Valleys
Map copyright Ordnance Survey
The next slide is taken from here..
Looking west along the scarp slope
Map copyright Ordnance Survey
Physical features…. name them
5
River Gap
2
Escarpment
Dip
4
Slope
1.
Vale
3
Scarp Slope
6
6
Block diagram…physical features
River gap
Dip Slope
Spring line
Escarpment
Vale
Scarp slope
Porous chalk
Impermeable clay
A Closer Look at the Vale…..
• Look at the photo and describe the relief
• What rock underlies the vale?
first on the photo
…and then on the map
• look at the contours and
describe the relief
• remember to refer to
altitude and gradient
• is surface drainage
present or absent? Why?
Map copyright Ordnance Survey
• what is happening here?
..and here?
One of the springs
A Closer Look at the Escarpment
• How do the scarp and dip slopes differ?
• What rock underlies the escarpment?
first on the photo
…and then on the map
The Scarp Slope
 Look at the contours and
describe the relief
The Dip Slope
 Look at the contours and
describe the relief
 Is surface drainage present or absent?
Why?
Another feature of the escarpment…
Is photographed from here
Map copyright Ordnance Survey
What is this feature?
When and how were features like this created?
‘V’ shaped profile
..but no evidence of a stream
It’s the dry valley called Devil’s Dyke
How has this landscape influenced
Human Geography?
Recreation
Farming
Communications
Settlement
Prehistoric and Ancient Settlement
Why would settlement have
avoided the vale at that time?
Where was it located and
why?
Map copyright Ordnance Survey
Modern Settlement
Where is it located and
why?
Map copyright Ordnance Survey
Farming
intensive or extensive?
arable or pastoral?
escarpment
vale
Communications
Explain the routes of :
a) the minor road network and
b) the South Downs Way
Map copyright Ordnance Survey
Recreation
What evidence is there of
recreational land use on the map?
Map copyright Ordnance Survey
Now remember!
Gap
Escarpment
Dip slope
Chalk
Scarp slope
Vale
Modern settlement
Spring line
Clay
Prehistoric settlement