The longest unit of geologic time

A subdivision of an eon

Dying out

A subdivision of a period

The separation of a population of organisms from the rest of its species due to a physical barrier

A stretch of land that connects two continents that were previously separated by water

The dying out of many species on Earth within a short period of time

The subdivision of an era

The youngest era of the Phanerozoic eon

An oxygen-poor environment where, over time, plant material changes into coal

The middle era of the Phanerozoic eon

The oldest era of the Phanerozoic eon

A body of water formed when ocean water floods continents

An ancient landmass that separated into present-day continents

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