Term

Geologists use what two references for time

Definition

Relative time and Absolute time

Term

Relative Time

Definition

subdivision of the earth's history in a specific order based upon relative age relationships. These subdivisions are given names, most of which can be recognized globally, usually on the basis of fossils.

Term

Absolute Time

Definition

Numerical ages in 'millions of years'. These are most commonly obtained via radiometric dating methods performed on appropriate rock types.