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Continental Glaciers (Ice Sheets) and Illinois Glaciation

Continental Glaciers (Ice Sheets) and Illinois Glaciation. The Ice Age. (1.8 mya - 10,000 years ago). Phanerozoic – EON Cenozoic – ERA Quaternary – PERIOD Pleistocene - EPOCH. Glacier Types. 2. Ice sheets (Continental glacier) Large scale – cover 10% of Earth’s land

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Continental Glaciers (Ice Sheets) and Illinois Glaciation

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  1. Continental Glaciers(Ice Sheets) and Illinois Glaciation

  2. The Ice Age (1.8 mya - 10,000 years ago) Phanerozoic – EON Cenozoic – ERA Quaternary – PERIOD Pleistocene - EPOCH

  3. Glacier Types • 2. Ice sheets (Continental glacier) • Large scale – cover 10% of Earth’s land • Greenland – 1.7 million km2 • Antartica – 13.9 million km2

  4. Continental Glaciers

  5. Glaciation in Illinois • Wisconsinan 75,000 – 10,000 ya • Illinoian 300,000 – 125,000 ya • Kansan 700,000 – 500,000 ya • Nebraskan 1,800,000 – 900,000 ya

  6. Glaciation in Illinois • Wisconsinan 75,000 – 10,000 ya • Illinoian 300,000 – 125,000 ya • Pre-Illinoian

  7. End moraines and till plains

  8. 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

  9. Glacial Deposits Moraine – a sediment pile composed of till deposited by a glacier

  10. Till – Mixture of unsorted mud, sand, pebbles, and larger rocks deposited by glaciers

  11. Ice Sheet Landforms Outwash – sand and gravels deposited by glacial meltwater

  12. Pro-Glacial Lake Sediments

  13. Ice Sheet Landforms – Kettle Lakes

  14. Ice Sheet Landforms - Eskers

  15. Ice Sheet Landforms - Drumlins

  16. Ice Sheet Landforms Drumlins

  17. Glaciation relocated rivers

  18. Pre-Illinoian Drainage

  19. Illinoian Glaciation & Drainage

  20. Wisconsinan Glaciation & Drainage

  21. Lobes And Moranic systems

  22. Chief Waupansee

  23. Points to Ponder Was this change unique in time? Why did the climate change?

  24. Why did the climate change? 1.changing continental positions 2.uplift of continental blocks 3.reduction of CO2 in the atmosphere 4.changes in the Earth's orbit

  25. Plate Tectonics is one of the keys to paleozoic glaciation 250 million years ago

  26. Changes in Earth’s Orbit • The Milankovitch Theory

  27. The Milankovitch Theory Eccentricity of the orbit

  28. The Milankovitch Theory Changes in Earth’s tilt

  29. Earth-Sun Relations

  30. The Milankovitch Theory Precession of the Equinoxes

  31. Cycles of Global Warming

  32. Snowball Earth

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