Neoproterozoic
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| Supereon | Eon | Era | Period | Start Million years ago |
|---|---|---|---|---|
| Phanerozoic | Palaeozoic | Cambrian | 0541 | |
| Precambrian | Proterozoic | Neoproterozoic | Ediacaran | 0635 |
| Cryogenian | 0850 | |||
| Tonian | 1000 | |||
| Mesoproterozoic | 1600 | |||
| Palaeoproterozoic | 2500 | |||
| Archaean | 4000 | |||
| Hadean | 4567 | |||
The Neoproterozoic era lasted from 1,000 to 541.0 million years ago (mya).[1][2]
In the first period, the Tonian, the global supercontinent Rodinia broke up into separate land masses.
In the second period, the Cryogenian, the Earth had two great ice ages, the Sturtian and Marinoan glaciations. These ice ages were so severe they are sometimes called Snowball Earth.
In the third period, the Ediacaran,[3] the earliest fossils of multicellular organisms are found, the Ediacaran biota.
References [change]
- ↑ International Chronostratigraphic Chart. [1]
- ↑ Ogg, James G; Ogg, Gabi & Gradstein, Felix M. 2008. The concise geologic time scale. Cambridge University Press. pp. 184. ISBN 9780521898492. http://www.cambridge.org/catalogue/catalogue.asp?isbn=0521898498.
- ↑ Knoll, A.H. et al (2006). "The Ediacaran Period: a new addition to the geologic time scale". Lethaia 39 (1): 13–30. doi:10.1080/00241160500409223. PDF here.
| Precambrian (4.567 gya – 541 mya) | |
|---|---|
| In the left column are Eons, bold are Eras, not bold are Periods. gya = billion years ago, mya = million years ago | |
| Hadean (4.567 gya – 4 gya) | |
| Archaean (4 gya – 2.5 gya) | |
| Proterozoic (4 gya – 2.5 gya) | Palaeoproterozoic (2.5 gya – 1.6 gya)
Mesoproterozoic (1.6 gya – 1 gya) Neoproterozoic (1 gya - 541 mya) Tonian (1 gya – 850 mya) Cryogenian (850 mya – 635 mya) Ediacaran (635 mya – 541 mya) |
| Source | International Chronostratigraphic Chart 2013. International Commission on Stratigraphy, retrieved 8 April 2013. Divisions of geologic time – major chronostratigraphic and geochronologic units USGS, retrieved 8 April 2013. |
