Rocky road.(Earth/Geology)(Brief Article)

Science World | September 20, 2004| | Copyright

Geologists have just added a new chapter to Earth's lengthy time line, called the geologic time scale.

This scale divides Earth's history into eras (long units of geologic time) and periods (subdivisions of eras). These divisions are based on major changes in the types of life forms that inhabited the planet, explains Andrew Knoll, a geologist at Harvard University. Geologists track the changes using fossils (traces of ancient organisms found in rocks) in different rock layers.

The scale's newcomer--dubbed the Ediacaran (eedee-AH-kah-ren) Period--represents ...

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