3.6 POST-GLACIAL LANDFORMS
Diagram 3.6a A post - glacial landscape
ribbon loch
description - This is a long loch found on the floor of
a u-shaped valley.
explanation - This feature is formed where part of the
floor of a u - shaped valley is flooded. A rock bar (of harder
rock) or a terminal moraine is often responsible for damming
up the present day drainage.
diagram - Examine Diagram 3.6a.
misfit stream
description
- This is a river or stream flowing along the floor of a u -
shaped valley.
explanation - This is called a misfit stream as it could
not possibly have eroded the large valley it occupies.
diagram - Examine Diagram 3.6a.
waterfall Streams
flowing from hanging valleys often form waterfalls when they
plunge into the main u-shaped valley.
Examine Diagram 3.6a.
alluvial fan
When streams plunging from hanging valleys reach the main valley
floor they are unable to carry their load of boulders and sand
as their speed is drastically reduced. This forms a fan - shaped
mound of alluvium at the foot of the waterfall.
Examine Diagram 3.6a
scree This
is layer of irregular shaped angular boulders deposited on the
hillside as a result of frost shattering.
Examine Diagrams 3.6a. and 1.3a
raised beaches
Examine Diagram 3.6b
Diagram 3.6b A raised beach
