Geologic Time: Subdivisions

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Dinosaurs were the dominant life form during this Era

Why didn't Trilobites lives during the Mesozoic Era?

Humans arrived during this most recent Era

The Cenozoic Era is also known as the Age of

Which Era ended with the greatest mass extinction in the history of Planet Earth, killing off nearly 95% of species?

During which time period did the continents form, life thrived as bacteria in the newly formed oceans, and the atmosphere began to fill with oxygen

During this Era fish and other soft bodied organisms lived in ancient seas for hundreds of millions of years

Which Era contains the Jurassic, Triassic and Cretaceous Periods?