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Science Earth science Earth Historical geology Geological timescale

Geological timescale

Proposed geologic epoch for the timespan of significant human impact on the Earth

Geologic eon, 4031–2500 million years ago

First period of the Paleozoic Era, 541-485 million years ago

Fifth period of the Paleozoic Era

Third era of the Phanerozoic Eon 66 million years ago to present

Third and last period of the Mesozoic Era 145-66 million years ago

Fourth period of the Paleozoic Era 419-359 million years ago

Third and last period of the Neoproterozoic Era

Second epoch of the Paleogene period

Geologic time scale

System that relates geological strata to time

First eon of geological time, beginning with the formation of the Earth about 4.6 billion years ago

Second period of the Mesozoic era

Mesoproterozoic

Second era of the Proterozoic Eon

Second era of the Phanerozoic Eon

First epoch of the Neogene Period

Second geologic period in the Cenozoic Era 23–2.6 million years ago

Third and last era of the Proterozoic Eon

Third epoch of the Paleogene period

Second period of the Paleozoic Era

First epoch of the Paleogene Period

First period of the Cenozoic Era 66-23 million years ago

First era of the Phanerozoic Eon 541-252 million years ago

Sixth and last period of the Paleozoic Era 299–252 million years ago

Fourth and current eon of the geological timescale

First epoch of the Quaternary Period

Second epoch of the Neogene period

The earliest part of Earth's history: 4600–541 million years ago

Third eon of the geologic timescale, last eon of the Precambrian Supereon

Third and current period of the Cenozoic Era, from 2.58 million years ago to the present

Third period of the Paleozoic Era 444-419 million years ago

First period of the Mesozoic Era