Sturtian glaciation

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Events of the Cryogenian Period
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-760 —
-740 —
-720 —
-700 —
-680 —
-660 —
-640 —
-620 —
First sponge-like animal?[2]
Kaigas glaciation?[3]
Major Glacial period

The Sturtian glaciation was a glaciation during the Cryogenian period. During the Cryogenian the Earth experienced repeated large scale glaciations, the Sturtian glaciation being the longest one, lasting about 60 million years.[1]

According to Eyles and Young, "Glaciogenic rocks figure prominently in the Neoproterozoic stratigraphy of southeastern Australia and the northern Canadian Cordillera. The Sturtian glaciogenic succession (c. 740 Ma) unconformably overlies rocks of the Burra Group." The Sturtian succession includes two major diamictite-mudstone sequences, which represent glacial advance and retreat cycles. It is stratigraphically correlated with the Rapitan Group of North America.[5]

Naming[edit]

The Sturtian glaciation is named after the Sturt River Gorge (Near Bellevue Heights, South Australia).

See Also[edit]

References[edit]

  1. ^ a b c Arnaud, Emmanuelle; Halverson, Galen P.; Shields-Zhou, Graham Anthony (30 November 2011). "Chapter 1 The geological record of Neoproterozoic ice ages". Memoirs. Geological Society of London. 36 (1): 1–16. doi:10.1144/M36.1. 
  2. ^ Brain, C. K.; Prave, A. R.; Hoffmann, K. H.; Fallik, A. E.; Herd D. A.; Sturrock, C.; Young, I.; Condon, D. J.; Allison, S. G. (2012). "The first animals: ca. 760-million-year-old sponge-like fossils from Namibia". S. Afr. J. Sci. 108 (8): 1–8. doi:10.4102/sajs.v108i1/2.658. 
  3. ^ Macdonald, F. A.; Schmitz, M. D.; Crowley, J. L.; Roots, C. F.; Jones, D. S.; Maloof, A. C.; Strauss, J. V.; Cohen, P. A.; Johnston, D. T.; Schrag, D. P. (4 March 2010). "Calibrating the Cryogenian". Science. 327 (5970): 1241–1243. doi:10.1126/science.1183325. PMID 20203045.  (Duration and magnitude are enigmatic)
  4. ^ "Discovery of possible earliest animal life pushes back fossil record". phys.org. Retrieved 7 December 2012. 
  5. ^ Eyles, Nicholas; Young, Grant (1994). Deynoux, M.; Miller, J.M.G.; Domack, E.W.; Eyles, N.; Fairchild, I.J.; Young, G.M., eds. Geodynamic controls on glaciation in Earth history, in Earth's Glacial Record. Cambridge: Cambridge University Press. pp. 5–10. ISBN 0521548039.