Subdivisions of the Earth's geology (periods, epochs and ages) from Cenozoic to Precambrian in relative and absolute time (million years).

Short summaries of the periods tectonic setting, climate, plant and animal development are included.

Magnetic anomalies are listened for Cenozoic and Mesozoic.
A find field will open up all available eras, periods and ages.

Update Description:
v1.4 (1/15/2002):
- Some typo errors were fixed.