Glacial landforms and layers I

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Glacial landforms and layers I
Lecture 13
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Basic kinematic behavior of a glacier
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Basic divisions

• Upper reaches (Destructional, erosional)
• Middle reaches (Transporting, balance of
  erosion and deposition)
• Lower reaches (Constructional, deposition)

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Transformation of a fluvial destructional
landscape into a glacial one
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Destructional landforms at the origins
Cirques, horns, and arêtes
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Rock avalanches and burgschrunds
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The distribution system
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Lateral moraines, medial moraines
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Ice-marginal channel
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Fossil ice-marginal channels
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The terminus
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Late Pleistocene terminus, Alaska range
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Terminal, recessional and ground moraines
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1973
2002
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Glacio-fluvial environments
A sandur
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Braided streams
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