Coasts and mass
Longshore drift in this area has
been responsible for the
of sand bars across the mouths of
several streams such as those in
squares 8244 and 8345. When
sand spits appear on an O.S. map
the direction of the longshore
drift can be determined as it will
be moving towards where the end
of the spit is being formed. Here,
however, the direction of the
longshore drift cannot be
determined from the map as the
spits have formed sand bars right
across the river mouths.
These bars have trapped water
which form lagoons at Slapton
Ley and Lower Ley in 8243 and the
lake at 818411.
On this extract, the term ‘point’
(meaning headland) appears at Warren
Point, 667421, ‘cliff’ at West Cliff,
692383 and ‘cove’, indicating where
erosion has produced a small bay, such
as Redrot Cove at 668394 and Soar Mill
Cove at 697376.
Large headlands at Burgh Island,
646438 and Bolt Tail, 667396 stand out,
suggesting a much more resistant rock
type than in the area that lies in between
Smaller headlands like Warren Point and
Thurlestone Rock, 675414 enclose sandy
bays like the one at 676416.
Off the headland there are small islands;
Mew Stone 725359 and Little Mew
Stone, 727358. These will be former
parts of the headland now worn down to
be stacks or stumps.
Burgh Island was separated from the
mainland by erosion. Over time the sand
shown building up between Burgh Island
and the mainland may become permanent
and form a tombolo linking the island to
Symbol evidence is also important and we
see the symbols for cliffs at 688383 and
steep slopes at 704368.
Rapid, free-fall of
rock from a steep cliff
loosening the rock.
Bare lack of
well-jointed rock is
A scree slope of fallen
rock is formed at the
bottom of the cliff.
LANDSLIP or SLUMPING
RAPID movements of a
mass of earth or rock
sliding along a CONCAVE
Occur after periods of
HEAVY RAIN, when the
water saturates overlying
rock, making it heavy and
liable to slide.
UNDERCUTTING of a
steep slope by river or
sea erosion weakens the
rock above, also making a
Occurs on steep slopes
It's a rapid sudden
Occurs after periods of
heavy rain or RAPID
VEGETATION to hold
the soil in place,
saturated soil flows over
impermeable sub soil.
SOIL CREEP Very slow movement,
occuring on very gentle
repeatedly expand and
contract in wet and
When wet, soil
particles increase in
size and weight, and
expand at right angles.
When the soil dries
out, it contracts
As a result, the soil
Describe and explain the