User talk:Orangemarlin/Test page
Neoproterozoic Snowball Periods | ||||||
−1000 — – −950 — – −900 — – −850 — – −800 — – −750 — – −700 — – −650 — – −600 — – −550 — | Gaskiers Kaigas? (millions of years) | |||||
| ||||||
A recent estimate of the timing and duration of Proterozoic glacial periods. Note that great uncertainty surrounds the dating of pre-Gaskiers glaciations. The status of the Kaigas is not clear; its dating is very insecure and many workers do not recognise it as a glaciation. From Smith 2009.[1] An earlier and longer possible snowball phase, the Huronian glaciation, is not shown here. | ||||||
The Marinoan glaciation was a period of worldwide glaciation from approximately 650 to 635 Ma (million years ago) during the Cryogenian period. The glaciation may have covered the entire planet, in an event called the snowball earth. The end of the glaciation may have been caused by the release of methane from equatorial permafrost.[2]
- ^ Smith, A.G. (2009). "Neoproterozoic timescales and stratigraphy". Geological Society, London, Special Publications. 326. Geological Society, London, Special Publications: 27–54. doi:10.1144/SP326.2.
- ^ Shields, G. A. (2008). "Palaeoclimate: Marinoan meltdown". Nature Geoscience. 1 (6): 351–353. doi:10.1038/ngeo214.