GEG 120 Study Guide - Midterm Guide: Loess, Rock Flour, Outwash Plain
14 May 2013
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Document Summary
Glacial lake bonneville (today: great salt lake remnant) Terminal moraines: ice advances like a bulldozers pushing debris in front of it ice sheet. Huge amounts transported, especially over softer geologic materials. Most of load is carried in basal layer (much of it coarse) Powerful erosion agent (scouring), but deposition occurs as well. Glacial drift (deposited by melting ice sheets during deglaciation) Transport by melt water from ice front (sorted stratified drift) Depositional ridges and mounds (pushed-around rock debris) now reaches terminal point. Smooth elliptical hill rising above till plain (cigar-shaped) Long axis parallel to direction of ice movement. Moraines and drumlins are ice-deposited, but the landform situation becomes more complicated with meltwater. Meltwater flows atop, beneath, and in front of the ice sheet. Most outwash landforms develop ahead of the receding glacier on the outwash plain. Carries rock debris away from glacier and sorts it to varying degrees.
