lecture_11 - LECTURE 11 - GLACIOFLUVIAL SEDIMENTS...

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LECTURE 11 - GLACIOFLUVIAL SEDIMENTS CHANNELIZED ICE CONTACT DEPOSITS N channels associated with lodgement till lenticular to linear cm to m wide, cm to 10s cm thick sand or sand and gravel oriented to hydraulic potential field sheared seds, or sheared upper surface R channels same as N channels but not sheared eskers long, narrow, sinuous deposits crested or round topped 10 km long, up to 60 m high subhorizontal bedding faulted margins or twined ridges generally parallel to ice flow
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related to fractures in ice channel open or closed wide range of washed sediment types gravel to bedded silts variable discharges roof falls -> large clasts or boulders may contain flow tills, till balls crevasse fillings open to surface linear, sometimes flat topped often filled with water gravel to bedded silts variable discharge ice rafted material possible may contain flow tills, till balls kame terraces associated with valley walls flat topped horizontal bedding
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This note was uploaded on 07/25/2008 for the course GLG 412 taught by Professor Larson during the Spring '08 term at Michigan State University.

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lecture_11 - LECTURE 11 - GLACIOFLUVIAL SEDIMENTS...

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