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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
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 • Greenland – 1.7 million km2 • Antartica – 13.9 million km2
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
Glaciation in Illinois • Wisconsinan 75,000 – 10,000 ya • Illinoian 300,000 – 125,000 ya • Pre-Illinoian
End moraines and till plains
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
Glacial Deposits Moraine – a sediment pile composed of till deposited by a glacier
Till – Mixture of unsorted mud, sand, pebbles, and larger rocks deposited by glaciers
Ice Sheet Landforms Outwash – sand and gravels deposited by glacial meltwater
Ice Sheet Landforms Drumlins
Lobes And Moranic systems
Points to Ponder Was this change unique in time? Why did the climate change?
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
Plate Tectonics is one of the keys to paleozoic glaciation 250 million years ago
Changes in Earth’s Orbit • The Milankovitch Theory
The Milankovitch Theory Eccentricity of the orbit
The Milankovitch Theory Changes in Earth’s tilt
The Milankovitch Theory Precession of the Equinoxes
