Ice Ages andthe Missoula Floods

Basic GlacierTypes

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Valley Glaciers (South Cascade Glacier)

Ice Sheets (Greenland)

Anatomy of a GlacierWhen it gets colder or wetter - glaciers get bigger

Climate Since the Cenozoic

Tukwilla Fm

Blakeley FmVashon Fm

H-2

How do we know that we have been in an Ice Age for 2 Myrs?

Evidence of:1. Glacial Erosion2. Glacial Sediments3. Glacial Landforms

1. Glacial Erosion

Mt. Stuart

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2. Glacial Sediments

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Till

Outwash (Sand & Gravel)

3. Glacial LandformsMoraine

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Glacial Erratic

North American Ice SheetsLast Glacial Period (ca. 20,000 yrs)

H-1

17,000 years ago

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H-4

Puget Sound Ice

(map D Molenaar, 1987)

Puget Sound During the Ice Age (A Modern Analogy - Columbia Glacier, AK)

Austin Post

Sequence of Events

Puget Sound Animation

H-10

Seattle Area Shows

Evidence for Several Glacial

Advances

Glacial Formations

in Puget Sound

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H-3

Climate Since the CenozoicH-2

Glacial Cycles Within an Ice Age

Quaternary Ice Age2 Myrs

Glacial Period

Interglacial Period

H-3

Glacial Sediments in Puget Sound