Illinois Glaciation

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 Pre-Illinoian

EARLY PRE-ILLINOIS GLACIAL EPISODES

LATE PRE-ILLINOIS EPISODE

ILLINOIS EPISODE

LAST GLACIAL MAXIMUM

Potential Causes of Glaciation Milankovitch Cycles Changing Albedo Global Heat Conveyor CO2 Fluctuations Solar Variability

Milankovitch Cycles

The Milankovitch Theory Eccentricity of the orbit

The Milankovitch Theory Changes in Earth’s tilt

The Milankovitch Theory Precession of the Equinoxes

Albedo Effect