参考资料

^Lane, Nick.First breath: Earth"s billion-year struggle for oxygen. New Scientist. 5 February 2010, (2746).  A snowball period, c2.4–c2.0 Gya, triggered by the Great Oxygenation Event[1]

^Williams G.E.; Schmidt P.W.Paleomagnetism of the Paleoproterozoic Gowganda and Lorrain formations, Ontario: low palaeolatitude for Huronian glaciation(PDF). EPSL. 1997, 153(3): 157–169.Bibcode:1997E&PSL.153..157W. doi:10.1016/S0012-821X(97)00181-7. 

^Evans, D.A.; Beukes, N.J.; Kirschvink, J.L.Low-latitude glaciation in the Palaeoproterozoic era. Nature. March 1997, 386(6622): 262–6.Bibcode:1997Natur.386..262E. doi:10.1038/386262a0. 

^Kopp, Robert E.; Kirschvink, Joseph L.; Hilburn, Isaac A.; Nash, Cody Z.The Paleoproterozoic snowball Earth: A climate disaster triggered by the evolution of oxygenic photosynthesis. Proc. Natl. Acad. Sci. U.S.A. 2005, 102(32): 11131–6.Bibcode:2005PNAS..10211131K. PMC 1183582. PMID 16061801. doi:10.1073/pnas.0504878102. 

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