Ice Ages and the Missoula Floods. Basic Glacier Types Valley Glaciers (South Cascade Glacier) Ice Sheets (Greenland)

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Presentation transcript:

Ice Ages and the Missoula Floods

Basic Glacier Types Valley Glaciers (South Cascade Glacier) Ice Sheets (Greenland)

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

Climate Since the Cenozoic Tukwilla Fm Blakeley Fm Vashon Fm H-2

How do we know that we have been in an Ice Age for 2 Myrs? Evidence of: 1.Glacial Erosion 2.Glacial Sediments 3.Glacial Landforms

1. Glacial Erosion

Mt. Stuart

2. Glacial Sediments Till Outwash (Sand & Gravel)

3. Glacial Landforms Moraine Glacial Erratic

North American Ice Sheets Last Glacial Period (ca. 20,000 yrs) H-1

17,000 years ago 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 H-3

Climate Since the Cenozoic H-2

Glacial Cycles Within an Ice Age Quaternary Ice Age 2 Myrs Glacial Period Interglacial Period H-3

Glacial Sediments in Puget Sound

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