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Continental Glaciers (Ice Sheets) and Illinois Glaciation.
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Transcript of Continental Glaciers (Ice Sheets) and Illinois Glaciation.
![Page 1: Continental Glaciers (Ice Sheets) and Illinois Glaciation.](https://reader036.fdocuments.in/reader036/viewer/2022062407/56649cf95503460f949ca788/html5/thumbnails/1.jpg)
![Page 2: Continental Glaciers (Ice Sheets) and Illinois Glaciation.](https://reader036.fdocuments.in/reader036/viewer/2022062407/56649cf95503460f949ca788/html5/thumbnails/2.jpg)
Continental Glaciers(Ice Sheets)
and
Illinois Glaciation
![Page 3: Continental Glaciers (Ice Sheets) and Illinois Glaciation.](https://reader036.fdocuments.in/reader036/viewer/2022062407/56649cf95503460f949ca788/html5/thumbnails/3.jpg)
Phanerozoic – EON
Cenozoic – ERA
Quaternary – PERIOD
Pleistocene - EPOCH
(1.8 mya - 10,000 years ago)
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![Page 5: Continental Glaciers (Ice Sheets) and Illinois Glaciation.](https://reader036.fdocuments.in/reader036/viewer/2022062407/56649cf95503460f949ca788/html5/thumbnails/5.jpg)
2. Ice sheets (Continental glacier)
• Large scale – cover 10% of Earth’s land
Greenland – 1.7 million km2
Antartica – 13.9 million km2
Glacier Types
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Continental Glaciers
![Page 7: Continental Glaciers (Ice Sheets) and Illinois Glaciation.](https://reader036.fdocuments.in/reader036/viewer/2022062407/56649cf95503460f949ca788/html5/thumbnails/7.jpg)
![Page 8: Continental Glaciers (Ice Sheets) and Illinois Glaciation.](https://reader036.fdocuments.in/reader036/viewer/2022062407/56649cf95503460f949ca788/html5/thumbnails/8.jpg)
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Glaciation in Illinois
1. Wisconsinan 75,000 – 10,000 ya
2. Illinoian 300,000 – 125,000 ya
3. Kansan 700,000 – 500,000 ya
4. Nebraskan 1,800,000 – 900,000 ya
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Glaciation in Illinois
1. Wisconsinan 75,000 – 10,000 ya
2. Illinoian 300,000 – 125,000 ya
3. Pre-Illinoian
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End moraines
and
till plains
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Glacial Deposits
Drift – Sediment deposited on land or in water as a result of glaciation.
Till – Unsorted debris transported by glaciers and deposited on land.
Diamicton – Does not infer digenesis
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Moraine – a sediment pile composed of till deposited by a glacier
Glacial Deposits
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Till – Mixture of unsorted mud, sand, pebbles, and larger rocks deposited by glaciers
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Ice Sheet Landforms
Outwash – sand and gravels deposited by glacial meltwater
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Pro-Glacial Lake Sediments
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Ice Sheet Landforms – Kettle Lakes
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Ice Sheet Landforms - Eskers
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Ice Sheet Landforms - Drumlins
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Ice Sheet Landforms
Drumlins
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Glaciation relocated rivers
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Pre-Illinoian Drainage
![Page 31: Continental Glaciers (Ice Sheets) and Illinois Glaciation.](https://reader036.fdocuments.in/reader036/viewer/2022062407/56649cf95503460f949ca788/html5/thumbnails/31.jpg)
Illinoian Glaciation & Drainage
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Wisconsinan Glaciation & Drainage
![Page 33: Continental Glaciers (Ice Sheets) and Illinois Glaciation.](https://reader036.fdocuments.in/reader036/viewer/2022062407/56649cf95503460f949ca788/html5/thumbnails/33.jpg)
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Lobes
And
Moranic systems
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Chief Waupansee
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Was this change unique in time?
Why did the climate change?
Points to Ponder
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1. changing continental positions
2. uplift of continental blocks
3. reduction of CO2 in the atmosphere
4. changes in the Earth's orbit
Why did the climate change?
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Plate Tectonics is one of the keys to paleozoic glaciation 250 million years ago
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Changes in Earth’s Orbit
• The Milankovitch Theory
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The Milankovitch Theory
Eccentricity of the orbit
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Changes in Earth’s tilt
The Milankovitch Theory
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Earth-Sun Relations
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Precession of the Equinoxes
The Milankovitch Theory
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Cycles of Global Warming
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Snowball Earth