Lioncrusher's Domain -- Geologic Time Scale

Geologic Time Scale

Ordered from most recent (mya = million years ago)

Phanerozoic Eon (544 mya - present)

Era: Cenozoic (65 mya - Present)
- Period: Quaternary (1.8 mya - Present)
  - Epoch: Holocene (8,000 ya - Present)
  - Epoch: Pleistocene (1.8 mya – 8,000 ya)
- Period: Tertiary (65 – 1.8 mya)
  - Epoch: Pliocene (5.3 – 1.8 mya)
  - Epoch: Miocene (23.8 – 5.3 mya)
  - Epoch: Oligocene (33.7 – 23.8 mya)
  - Epoch: Eocene (55.5 – 33.7 mya)
  - Epoch: Paleocene (65 – 55.5 mya)
Era: Mesozoic (248 – 65 mya)
- Period: Cretaceous (145 – 65 mya)
- Period: Jurassic (213 – 145 mya)
- Period: Triassic (248 – 213 mya)
Era: Paleozoic (544 – 248 mya)
- Period: Permian (286 – 248 mya)
- Period: Carboniferous (360 – 286 mya)
- Period: Devonian (410 – 360 mya)
- Period: Silurian (440 – 410 mya)
- Period: Ordovician (505 – 440 mya)
- Period: Cambrian (544 – 505 mya)

Precambrian Eon (4.5 bya- 544 mya)

Era: Proterozoic (2.5 bya – 544 mya)
- Period: Neoproterozoic (900 to 543 mya)
- Period: Mesoproterozoic (1.6 bya to 900 mya)
- Period: Paleoproterozoic (2.5 to 1.6 bya)
Era: Archaen (3.8 to 2.5 bya)
Era: Hadean (4.5 to 3.8 bya)

Note: Ages are highly controversial, tend to be regional, and are not accepted internationally, so they are not listed here.

Rank:

Eon: Largest division, spans several eras, and can be several millions to billions of years.
Era: Can last for tens or hundreds of millions of years, usually coincides with arrival of specific life forms (eg: Mesozoic: dinosaurs)
Period: Subdivision of Era. Lasts 30-80 my.
Epoch: Subdivision only commonly used in the Cenozoic era, with ages being more commonly used elsewhere.
Age: Usually 5-10 my in duration. Age times and names can vary between regions.
Chron: Less than 1 million years, denotes period of time when a certain species was found fossilized.