Transcript Document

LITHOSPHERE
deposition GLACIATION
These slide-shows are all on the Geography blog if
you wish to copy any notes from them; we will not
be stopping in class for you to do this
LANDFORMS OF GLACIAL DEPOSITION
Materials carried by the glaciers are deposited in
two main ways;
Glacial Deposits (unsorted) and
Fluvio-glacial deposits (sorted)
In your textbook, read the section about
glacial deposition and take notes(page 99 –
104)
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LITHOSPHERE
deposition GLACIATION
 Moraine
is the waste material worn away and
collected by the ice.
It is angular in shape.
Glacial deposits are poorly sorted, ie all different
sizes and rock types are mixed together.
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LITHOSPHERE
deposition GLACIATION
See the moraine on the glacier surface.
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LITHOSPHERE
deposition GLACIATION
TYPES OF MORAINE
Lateral moraine is found on
the sides of the glacier.
Scree, from frost
shattering, is an important
source.
Ground moraine is
found at the base
(bottom) of the ice.
It is also called till
or boulder clay.
Supra-glacial
Englacial moraine is found
inside the ice itself.
Medial moraine is found
down the middle of the
glacial surface and occurs
when the inner lateral
moraines of two glaciers
join.
Terminal moraine is found
in front of the snout of
the glacier if it is
stationary. It represents
the maximum advance of
the ice.
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LITHOSPHERE
deposition GLACIATION
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LITHOSPHERE
GLACIATION
Evidence of glacial
deposition in then
UK
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LITHOSPHERE
Terminal moraine
deposition GLACIATION
Snout of glacier
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LITHOSPHERE
ERRATICS
deposition GLACIATION
Erratics are large rocks
that are completely
different from the type
of rocks on which they
rest
They were carried
by the ice-sheet,
sometimes for
hundreds of
kilometres
and then
deposited.
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LITHOSPHERE
deposition GLACIATION
Erratics like this are often found on the
valley floor.
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LITHOSPHERE
deposition GLACIATION
ESKER
Glacial streams are found
under the ice.They are
loaded with debris (sand
and gravel) carried by the
meltwater.
As the ice retreats, the
river deposits its load.
The built-up river bed is
called an Esker.
This river has all but dried
up!
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LITHOSPHERE
deposition GLACIATION
An esker is a steep-sided, long, winding ridge, made
up of gravel and sand. Most are tree-covered.
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LITHOSPHERE
DRUMLIN
Drumlins are smooth,
rounded
mounds of ground
moraine.
The steep (stoss)
side faces the
direction the ice
Moved from.
Drumlins often occur
in swarms or groups
on the valley floor.
deposition GLACIATION
Side view
Plan view
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LITHOSPHERE
deposition GLACIATION
Here is a drumlin outside Buchlyvie.
Can you work out the ice direction?
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LITHOSPHERE
deposition GLACIATION
Meltwater
streams
bringing
outwash to be
distributed
across an
outwash plain.
Note the
braiding of
the stream
channels.
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LITHOSPHERE
deposition GLACIATION
A KETTLEHOLE LAKE
LOCH MORLICH
There’s also the
LAKE OF
MENTEITH
depression formed when ice melts
depression filled with water to form kettle lake
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LITHOSPHERE
deposition GLACIATION
What is a kame terrace?
GLACIER
Once the ice has
melted, the debris has
been lowered to the
valley floor and
created a terrace with
a steep side and
flattish top.
During the end stages of
glaciation, a lake gathers
at each side of the ice,
filling with moraine.
Kame terraces
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LITHOSPHERE
deposition GLACIATION
This slide shows a set of kame terraces.
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LITHOSPHERE
deposition GLACIATION
Identify the features shown on the diagram by matching
the numbers to the names given.
Esker / Terminal Moraine / Outwash Plain / Drumlin /
Till (Ground Moraine/Boulder Clay) / Kettlehole lake /
Outwash Sands and Gravels.
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LITHOSPHERE
deposition GLACIATION
As you go through your revision, for each
feature mentioned, look back through your
textbooks and this presentation. You are
looking for named examples of as many
features as possible.
Remember that you will get marks in the exam
and NAB’s for showing the skill of quoting
places as examples from your notes!
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