1. Current Refinements of Stratigraphy
2. Biostratigraphy
3. Absolute Age Dating
4. Origin of the Earth
5. Early Development of the Continents
6. Plate Tectonics
7. Earth History
8. Origin of Life
9. Evolution of Life
10.Precambrian
11.Paleozoic
12. Mesozoic
13. Cenozoic
2. Biostratigraphy
3. Absolute Age Dating
4. Origin of the Earth
5. Early Development of the Continents
6. Plate Tectonics
7. Earth History
8. Origin of Life
9. Evolution of Life
10.Precambrian
11.Paleozoic
12. Mesozoic
13. Cenozoic