Landforms Resulting from Fluvio Glacial Deposition

1
Landforms Resulting from Fluvio Glacial Deposition

• What happens when the glacier melts?

2
Landforms Resulting from Fluvio Glacial Deposition

• By the end of this cycle you will be able to
  describe the formation of
• Outwash plains
• Eskers
• Kames
• Kettleholes

3
Landforms Resulting from Fluvio Glacial Deposition

• You will know if you have been successful if you
  can
• answer a past paper question
• devise a past paper question marking guide
• mark your partners answer

4
Introduction

• Fluvio glacial material differs from till in that
  it is sorted, stratified (layered).
• Because it was transported by water over longer
  distances than ice it consists of more rounded
  deposits of mainly sand and gravel.

5
Features of fluvio glacial deposition

• Outwash plains
• Eskers
• Kames
• Kettleholes

6
Outwash plains

• Outwash plains are formed in the following way
• Meltwater streams rush through the terminal
  moraine picking up rock pieces.
• The streams then drop these pieces beyond the
  terminal moraine as they slow down.
• The largest pieces are dropped first, for example
  gravel, followed by smaller ones, for example
  sand.
• These areas of sand and gravel, rounded and
  sorted by meltwater, are called outwash plains.

7
BraidedStreams
Form on the outwash plain where channels of
meltwater get become clogged by course deposits,
encouraging the stream to braid or divide into
smaller streams.
8
Eskers

• Eskers are formed in the following ways
• A meltwater stream follows a tunnel beneath the
  melting glacier.
• The stream carries and deposits moraine, filling
  up the tunnel.
• When all of the ice melts, a long ridge of
  moraine is left in the shape of the streams
  tunnel.
• These long ridges are called eskers.

9
(No Transcript)
10
(No Transcript)
11
Kames

• Kames form in the following way
• Some ice is stagnant (doesnt move) normally at
  the edge or detached from the main glacier.
• Sands and gravel are washed into the crevasses of
  the stagnant ice.
• As the ice melts the debris is deposited on the
  ground.
• These mounds of debris are called kames.

12
(No Transcript)
13
(No Transcript)
14
(No Transcript)
15
Kettleholes

• Kettleholes form in the following way
• As the glacier retreats it may leave large blocks
  of buried ice.
• This ice slowly thaws over time and the covering
  gravel collapses leaving a depression.
• These depressions are called kettle holes.
• If the depressions are deep enough to tap the
  water table a kettle hole lake forms.

16
(No Transcript)