Geologic Time Scale Review

Front

What is the Mesozoic Era commonly referred to as?

Back

The Age of Reptiles.

Front

What type of event typically marks the end of an Era in the geologic time scale?

Back

A Mass Extinction.

Front

How old do Paleontologists estimate the Earth to be?

Back

4.6 billion years old.

Front

Which era is known for the dominance of trilobites, fishes, and other marine organisms?

Back

Paleozoic Era.

Front

In which Era were dinosaurs and reptiles the dominant species?

Back

Mesozoic Era.

Front

What are the three main eras of the Phanerozoic Eon?

Back

Paleozoic, Mesozoic, and Cenozoic.

Front

What significant event occurred at the end of the Paleozoic Era?

Back

The Permian-Triassic extinction event.

Front

What is the significance of the Cenozoic Era in terms of mammalian evolution?

Back

It is known as the Age of Mammals.

Front

What major geological event is associated with the Mesozoic Era?

Back

The breakup of the supercontinent Pangaea.

Front

What is the primary method used by scientists to date geological events?

Back

Radiometric dating.