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


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.

  • 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.


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…

Fig. 5.7, p. 128


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!

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

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


GLACIERS in TEXAS???

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

BUT –

They DID effect our climate!

Texas during the Pleistocene Ice Ages was Cooler & Drier!


Typical South Texas scene, 15,000 years ago


Can we still find the Ice Ages in Texas?

Of Course!


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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