The Geologic Time Scale has been subdivided into a number of time units called periods on the basis of

Why are ancient volcanic ash deposits important to geologists?

Approximately what percent of geologic time since the estimated origin of the Earth is represented by the Precambrian Era?

Which sequence shows the correct order of Earth's geologic time intervals from oldest to youngest?

Which choice lists the units of geologic time in order from largest time unit to smallest?

Index fossils are important to studying geologic time because

A good index fossil must be...

Which epoch is associated with the Last Ice Age to occur in NYS?

Geologists estimate the time of Earth's origin and the entire solar system to be

What event usually marks the end of one era and the beginning of another?

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