Geologic Features of Glaciation

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Presentation transcript:

Geologic Features of Glaciation

Horn Mountain peak formed by glacial erosion

Cirque Bowl shaped depression in a mountain formed by glacial erosion and frost wedging

Arete Sharp ridge between two cirques formed by glacial erosion of bedrock on mountain peaks

Esker Snake like deposit of gravel formed by glacier deposition in a meltwater stream

Lateral Moraine Narrow band of sediment along the outer sides of an alpine glacier formed by erosion of valley walls

Medial Moraine Narrow band of sediment within an alpine glacier formed when two lateral moraines meet

End Moraine Mound of unsorted sediment at the end of a glacier formed by glacial advancement which bulldozes sediment to a ridge

Ground Moraine Loose sediment found along flat terrain once covered by a glacier; formed when sediment is left behind by a retreating glacier

Kettle Lake Hole that fills with glacial water formed when ice breaks off glaciers and melts

Drumlin Elongated hill of sediment formed by deposition of a retreating glacier

Outwash Plain Accumulation of sediment in front of an end moraine formed by glacial deposition

Meltwater Rivers of glacial water filled with sediment formed when glaciers melt

U-Shaped Valley Alpine valleys shaped like a U due to glacial erosion

Erractics Transported rocks and boulders due to glacial movement and deposition

Till Unsorted glacial sediment due to glacial deposition

Kame Hill of sorted glacial deposits found on ground moraines; formed by deposits made by a retreating glacier

Truncated Spur Steep triangular shaped valley walls formed by alpine glacial erosions

Tributary Glaciers Small glacial rivers that eventually join a valley glacier; due to glaciers forming in small alpine regions

Braided Stream Stream of meltwater that flows towards an outwash plain; formed as glacier melts but rivers are choked with sediment

Glacial Striations Parallel scratches in bedrock due to glacial abrasion

Ogives Light and dark bands/ridges at the base of glacial ice falls; created by rapid glacial flow downhill (icefall)