1. Illinois Glaciation

3. 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

6. EARLY PRE-ILLINOIS GLACIAL EPISODES

7. LATE PRE-ILLINOIS EPISODE

8. ILLINOIS EPISODE

9. LAST GLACIAL MAXIMUM

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

13. Milankovitch Cycles

15. The Milankovitch Theory
Eccentricity of the orbit

16. The Milankovitch Theory
Changes in Earth’s tilt

17. The Milankovitch Theory Precession of the Equinoxes

18. Albedo Effect