Geological Timescale

Front

What are the three periods of the Mesozoic Era?

Back

Triassic, Jurassic, Cretaceous

Front

During which era did many animals begin to develop a skeleton?

Back

Paleozoic Era

Front

What era is known as the Age of the Mammals?

Back

Cenozoic Era

Front

What is the main purpose of the geologic time scale?

Back

To organize the major eras of Earth's history.

Front

Which is the oldest era in the geological timescale?

Back

Precambrian Era

Front

What major event marks the end of the Mesozoic Era?

Back

The mass extinction event that wiped out the dinosaurs.

Front

What are the three main eras of the geological timescale?

Back

Paleozoic, Mesozoic, Cenozoic.

Front

What significant development occurred during the Paleozoic Era?

Back

The development of fish and the first land plants.

Front

What is the significance of the Cenozoic Era?

Back

It is characterized by the dominance of mammals and birds.

Front

What does the term 'Precambrian' refer to?

Back

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