Geologic Time Scale Review

Front

What is the Geologic Time Scale?

Back

A system of chronological dating that relates geological strata to time, dividing Earth's history into eons, eras, periods, and epochs.

Front

What is an Eon?

Back

The largest division of geologic time, lasting hundreds of millions to billions of years.

Front

What is an Era?

Back

A major division of geologic time, smaller than an eon and characterized by significant worldwide changes in the types of fossils.

Front

What is a Period?

Back

A subdivision of an era, characterized by specific types of rock layers and fossil records.

Front

What is an Epoch?

Back

A subdivision of a period, representing a shorter time frame in the geologic time scale.

Front

Which era is known for the dominance of mammals?

Back

Cenozoic Era.

Front

During which era did dinosaurs dominate the Earth?

Back

Mesozoic Era.

Front

What significant event marks the end of the Paleozoic Era?

Back

A mass extinction event caused by major climate changes.

Front

What major development occurred during the Mesozoic Era?

Back

The first appearance of flowering plants.

Front

What is the Precambrian Time?

Back

The earliest part of Earth's history, before the Cambrian period, covering about 88% of Earth's history.