Chaotian (geology)

Short description: Proposed era of the Hadean eon

Chaotian

4568 – 4404 Ma

Had'n

Archean

Proterozoic

Pha.

Chronology
Subdivisions| See text
Usage information
Celestial body| Earth
Regional usage| Proposed subdivision of the Hadean eon
Definition
Chronological unit| Era
Stratigraphic unit| Erathem
First proposed by| C., Zahnle, K. J., Sleep, N. H., and Nisbet, E. G., 2010
Lower boundary definition| Formation of the Earth
Upper boundary definition| Collision between Proto-Earth and the Protoplanet Theia

The Chaotian is a proposed time division of the geologic time scale. First proposed in 2010[1] as an eon, it is named after Chaos, the primeval void in Greek mythology. This proposal defines the Chaotian eon as a Solar System-wide time between the initiation of planetary formation and the hypothesised collision of the trojan dwarf planet Theia with the proto-Earth.

A revised proposal in 2012[2] suggested the Chaotian as the first era of the Hadean representing the time between the formation of the Solar System c. 4.567 Ga[3] and the oldest preserved crustal material on Earth, a detrital zircon c. 4.404 Ga[4] from the Jack Hills of the Narryer Terrane in Western Australia.

As of September 2023[update], neither proposal had been adopted or officially ratified by the International Union of Geological Sciences.[5]

## Subdivisions

The original proposal in 2010 divided the Chaotian into two eras and four periods. No numerical upper age limits were provided, only the younger age limit of ~4.5 Ga for the boundary between the proposed Chaotian and Hadean boundary.

The revised proposal in 2012 did not subdivide the proposed Chaotian era (of the Hadean eon) into periods.

Proposed Chaotian time intervals (2010) [1] Eon  | Era  | Period  | Age (Ga)

|
|
|

Chaotian  | Neochaotian  | Titanomachaen  | > ~4.5
Hyperitian  |
Eochaotian  | Erebrean  |
Nephelean  |
Proposed Chaotian time intervals (2012) [2] Eon  | Era  | Age (Ga)

|
|

Hadean  | Jack Hillsian or Zirconian | 4.404 to 4.030
Chaotian  | 4.568 to 4.404

## See also

* Age of the Earth
* Formation and evolution of the Solar System
* Geologic time scale

## References

1. ↑ 1.0 1.1 Goldblatt, C.; Zahnle, K.J.; Sleep, N.H.; Nisbet, E.G. (2 February 2010). "The Eons of Chaos and Hades". Solid Earth 1 (1): 1–3. doi:10.5194/se-1-1-2010. Bibcode: 2010SolE....1....1G. https://www.solid-earth.net/1/1/2010/se-1-1-2010.html.
2. ↑ 2.0 2.1 Van Kranendonk, Martin J. (2012), Altermann, Wladyslaw; Beard, Brian L.; Hoffman, Paul F.; Johnson, Clark M.; Kasting, James F.; Melezhik, Victor A.; Nutman, Allen; Papineau, Dominic; Pirajno, Franco, "A Chronostratigraphic Division of the Precambrian" (in en), The Geologic Time Scale (Elsevier): pp. 299–392, doi:10.1016/b978-0-444-59425-9.00016-0, ISBN 978-0-444-59425-9, https://linkinghub.elsevier.com/retrieve/pii/B9780444594259000160, retrieved 2020-07-31
3. ↑ Connelly, J.N.; Bollard, J.; Bizzarro, M. (2017). "Pb–Pb chronometry and the early Solar System" (in en). Geochimica et Cosmochimica Acta 201: 345–363. doi:10.1016/j.gca.2016.10.044.
4. ↑ Wilde, Simon A.; Valley, John W.; Peck, William H.; Graham, Colin M. (11 January 2001). "Evidence from detrital zircons for the existence of continental crust and oceans on the Earth 4.4 Gyr ago". Nature 409 (6817): 175–178. doi:10.1038/35051550. PMID 11196637. Bibcode: 2001Natur.409..175W.
5. ↑ https://stratigraphy.org/chart

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Geological history of Earth

Cenozoic era
(present–66.0 Mya)|

| Quaternary (present–2.588 Mya)|

* Holocene (present–11.784 kya)
* Pleistocene (11.784 kya–2.588 Mya)

|

Neogene (2.588–23.03 Mya)|

* Pliocene (2.588–5.333 Mya)
* Miocene (5.333–23.03 Mya)

Paleogene (23.03–66.0 Mya)|

* Oligocene (23.03–33.9 Mya)
* Eocene (33.9–56.0 Mya)
* Paleocene (56.0–66.0 Mya)

Mesozoic era
(66.0–251.902 Mya)|

| Cretaceous (66.0–145.0 Mya)|

* Late (66.0–100.5 Mya)
* Early (100.5–145.0 Mya)

|

Jurassic (145.0–201.3 Mya)|

* Late (145.0–163.5 Mya)
* Middle (163.5–174.1 Mya)
* Early (174.1–201.3 Mya)

Triassic (201.3–251.902 Mya)|

* Late (201.3–237 Mya)
* Middle (237–247.2 Mya)
* Early (247.2–251.902 Mya)

Paleozoic era
(251.902–541.0 Mya)|

| Permian (251.902–298.9 Mya)|

* Lopingian (251.902–259.8 Mya)
* Guadalupian (259.8–272.3 Mya)
* Cisuralian (272.3–298.9 Mya)

|

Carboniferous (298.9–358.9 Mya)|

* Pennsylvanian (298.9–323.2 Mya)
* Mississippian (323.2–358.9 Mya)

Devonian (358.9–419.2 Mya)|

* Late (358.9–382.7 Mya)
* Middle (382.7–393.3 Mya)
* Early (393.3–419.2 Mya)

Silurian (419.2–443.8 Mya)|

* Pridoli (419.2–423.0 Mya)
* Ludlow (423.0–427.4 Mya)
* Wenlock (427.4–433.4 Mya)
* Llandovery (433.4–443.8 Mya)

Ordovician (443.8–485.4 Mya)|

* Late (443.8–458.4 Mya)
* Middle (458.4–470.0 Mya)
* Early (470.0–485.4 Mya)

Cambrian (485.4–541.0 Mya)|

* Furongian (485.4–497 Mya)
* Miaolingian (497–509 Mya)
* Series 2 (509–521 Mya)
* Terreneuvian (521–541.0 Mya)

Proterozoic eon
(541.0 Mya–2.5 Gya)|

| Neoproterozoic (541.0 Mya–1 Gya)|

* Ediacaran (541.0–~635 Mya)
* Cryogenian (~635–~720 Mya)
* Tonian (~720 Mya–1 Gya)

|

Mesoproterozoic (1–1.6 Gya)|

* Stenian (1–1.2 Gya)
* Ectasian (1.2–1.4 Gya)
* Calymmian (1.4–1.6 Gya)

Paleoproterozoic (1.6–2.5 Gya)|

* Statherian (1.6–1.8 Gya)
* Orosirian (1.8–2.05 Gya)
* Rhyacian (2.05–2.3 Gya)
* Siderian (2.3–2.5 Gya)

Archean eon (2.5–4 Gya)|

| Eras|

* Neoarchean (2.5–2.8 Gya)
* Mesoarchean (2.8–3.2 Gya)
* Paleoarchean (3.2–3.6 Gya)
* Eoarchean (3.6–4 Gya)

|

Hadean eon (4–4.6 Gya)|

|  |

|

kya = thousands years ago. Mya = millions years ago. Gya = billions years ago.
See also: Geologic time scale

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