Paleomagnetism is the study of the Earth's magnetic field as it has changed over geologic time.

His people lived here five thousand Earth years - an instant in geologic time.

I mean another past, in geologic time, that we simply don't know enough about.

Utah's rocks provide clues to the earth's environment during every period of geologic time.

We lack the perspective of geologic time, which might or might not be a good thing.

Mount Rainier is young by geologic time, barely one million years old.

They walked their separate courses at paces as if set to geologic time.

In geologic time, the answers may be only nanoseconds away.

Over most of geologic time, long-term sea level has been higher than today (see graph above).

It is also hard to comprehend the vastness of geologic time.