Baykonurian glaciation
Proterozoic snowball periods | ||||||
−750 — – −725 — – −700 — – −675 — – −650 — – −625 — – −600 — – −575 — – −550 — – −525 — | ||||||
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The Baykonurian glaciation is a glacial episode dating to around the Proterozoic–Phanerozoic boundary, at the end of the Ediacaran Period. The date of 547 million years ago has been proposed in the literature. The glaciation is posited as a contributor to the Cambrian explosion.[3] Its deposits are known in regions of Asia and Africa, and it apparently affected both palaeohemispheres. Glacial deposits possibly related to this glaciation have been found to be dated between 549 and 530 Ma.[4] It is named for the Baykonur Formation in Central Asia.[5][6]
Notes
- ^ Dating of pre-Gaskiers glaciations is uncertain. As for the Kaigas, its very existence is doubted by some. The Huronian glaciation is not shown; there is a lack of any significant evidence for a Snowball Earth during the time period.
References
- ^ a b c Pu, J.P. (2016). "Dodging snowballs: Geochronology of the Gaskiers glaciation and the first appearance of the Ediacaran biota". Geology. 44 (11): 955–958. Bibcode:2016Geo....44..955P. doi:10.1130/G38284.1. S2CID 31142776.
- ^ Smith, A. G. (2009). "Neoproterozoic timescales and stratigraphy". Geological Society, London, Special Publications. 326 (1): 27–54. Bibcode:2009GSLSP.326...27S. doi:10.1144/SP326.2. S2CID 129706604.
- ^ Germs, G.J.B.; Gaucher, C. (2012). "Nature and extent of a late Ediacaran (ca. 547 Ma) glacigenic erosion surface in southern Africa". South African Journal of Geology. 115 (1): 91–102. Bibcode:2012SAJG..115...91G. doi:10.2113/gssajg.115.91.
- ^ Chumakov, Nikolay (1 August 2009). "The Baykonurian glaciohorizon of the Late Vendian". Stratigraphy and Geological Correlation. 17 (4): 378–379. Bibcode:2009SGC....17..373C. doi:10.1134/S0869593809040029. Retrieved 17 March 2020.
- ^ Chumakov, N. M. (30 November 2011). "Chapter 26 Glacial deposits of the Baykonur Formation, Kazakhstan and Kyrgyzstan". Geological Society, London, Memoirs. 36 (1): 303–307. doi:10.1144/M36.26.
- ^ "Project 512 Neoproterozoic ice ages" (PDF). Russian National Committee for IGCP—Annual Report on IGCP-related Activities 2010. Russian National Committee for IGCP. 2010. p. 11. Retrieved 7 November 2016.