GEOL 001 Lecture Notes - Lecture 20: Glacier Morphology, Subsidence, Pluvial
20 Dec 2020
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Refers to all sediments of glacial origin. Material that is deposited directly by the glacier. Glacial erratics (boulders found in till on the surface) Sorted by size and weight of particles. A ridge of till along the sides of a valley glacier composed primarily of debris that fell to the glacier from the valley walls. A ridge of till formed when two alpine glaciers coalesce to form a single ice stream (dark stripes) Ridge of till that forms at the terminus of a glacier during a state of equilibrium between ablation and ice accumulation. Terminal moraines mark the limit of glacial advance. Recessional moraines mark small pauses during retreat. An undulating layer of till deposited as an ice front retreats due to ablation exceeding nourishment. The steep sides face the direction from which the ice advanced. Outwash plains (with ice sheets) and valley trains (when in a valley)
