Periglacial processes and landforms

Periglacial processes and landforms - Periglacial processes...

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Periglacial processes and landforms Characteristic periglacial landforms and deposits 1. blockfields (felsenmeer) o fields coarse angular blocks on high level summits 2. rock streams o sloping (3-12 o ) blockfields o fines at depth permits gelifluction and thus small terraces and oriented blocks 3. talus o slopes in coarse angular debris that falls to the foot of steep slopes o not unique to periglacial environments, but is characteristic given rates of frost shattering and rockfall on periglacial cliffs 4. rock glacier o thick deposits of rock debris that move as the result of an ice core or interstitial ice 5. gelifluction lobes o tongue-shaped masses of active layer with a gentle terrace and steep frontal scarp (1-6 m) where reisistance from adjacent materials causes the mass to bulge o occur in fields where lobes overlaps one another to from a staircase slope profile o composed of colluvium, angular debris from fines to boulders 6. cryoplanation terraces and nivation hollows o flattened summits and benched hillslopes
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This note was uploaded on 12/15/2011 for the course GLY GLY100 taught by Professor Jaymuza during the Fall '10 term at Broward College.

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Periglacial processes and landforms - Periglacial processes...

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