Glaciers
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Glaciers. What is a glacier? A thick mass of ice accumulated over a long period of time, that is able to flow. Types of Glaciers. Continental Glacier. Found only in Greenland & Antarctica Massive ice sheets that radiate out from one or more centers.

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Glaciers

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Glaciers

Glaciers


Glaciers

What is a glacier?

A thick mass of ice accumulated over a long period of time, that is

able to flow.


Glaciers

Types of Glaciers


Glaciers

Continental Glacier

  • Found only in Greenland & Antarctica

  • Massive ice sheets that radiate out from one or more centers.

  • Continental Glaciers covered Gondwana 300 mya.

  • Continental Glaciers covered North America & Eurasia <15,000 years ago. ( The Nebraskan, Kansan, Illinoian, and Wisconsin Glacial Periods)

  • Extremely valuable in climatology, vital to planet’s environmental well-being.


Glaciers

Valley Glaciers

  • Much smaller in scale, but still very impressive.

  • Found in all high mountainous areas, even on equator (Andes. Mt. Kenya and Kilimanjaro)

  • Despite their name, actually start on mountain peaks during periods of long winters and short, cool summers.

  • Over time, the accumulated snow turns to firn, which begins to flow downhill.

  • Glaciers act as gargantuan bulldozers, plowing up everything in their path (glacial plucking).

  • Glaciers are important shapers of landforms both when they advance (Fig. 5.4, p.126), and when they retreat(Fig. 5.7, p. 128).

  • Important indicator of climate change!


When glaciers come when glaciers go

When Glaciers come, When Glaciers go…

Fig. 5.7, p. 128


Terms you don t want to melt away

Terms you DON’T want to MELT away …

Kettle

Drumlin

Esker

Kame

Firn

Iceberg

Glacial plucking

Glacial striations

Glacial trough

Hanging Valley

Cirque

Arete

Glacial Horn

Fjord

Glacial Till

Glacial Erratic

Moraines

Outwash Plain


More cool pics

More “Cool” Pics!

http://www.uwgb.edu/dutchs/EarthSC202Slides/glacslid.htm

http://www.semi.sd36.bc.ca/mleziva/unit5/U05L01.htm


Glaciers

GLACIERS in TEXAS???

NEVER!!!!!!!!!!!!!

BUT –

They DID effect our climate!

Texas during the Pleistocene Ice Ages was Cooler & Drier!


Glaciers

Typical South Texas scene, 15,000 years ago


Glaciers

Can we still find the Ice Ages in Texas?

Of Course!


Glaciers

PLEISTOCENE FOSSIL LOCALITIES 1 = Nueces River

2 = Ingleside

3 = Aransas River

4 = Bee County

5 = Petronila Creek

  • GLACIAL RELICS

  • Bastrop State Park

  • Lost Maples State Natural Area

  • McKittrick Canyon in Guadalupe Mtns National Park


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