The Huronian glaciation (or Makganyene glaciation) lasted from 2400 million years ago (mya) to 2100 mya, during the Palaeoproterozoic era. It was named after evidence was collected from Lake Huron region in North America. There, three separate horizons of glacial deposits are separated by non-glacial sediment.
The glaciations were probably triggered by the Great Oxygenation Event (GOE), which removed atmospheric methane (a greenhouse gas), and eventually supplied free oxygen to the atmosphere. The alternate warm and ice age periods was probably caused by a repeating cycle. Cyanobacteria flourished in the warm periods, producing huge amounts of oxygen. The oxygen removed the free methane, and used up carbon dioxide. This caused the temperature to crash. This slowed down the bacteria. So the temperature rose again...
References[change | change source]
- Lane, Nick (2010). "First breath: Earth's billion-year struggle for oxygen". New Scientist (2746). http://www.newscientist.com/article/mg20527461.100-first-breath-earths-billionyear-struggle-for-oxygen.html. A snowball period, c2.4–c2.0 Gya, triggered by the Great Oxygenation Event 
- Williams G.E. & Schmidt P.W. (1997). "Paleomagnetism of the Paleoproterozoic Gowganda and Lorrain formations, Ontario: low palaeolatitude for Huronian glaciation" (PDF). EPSL 153 (3): 157–169. doi:10.1016/S0012-821X(97)00181-7. http://www.cosis.net/abstracts/EAE03/08262/EAE03-J-08262.pdf.
- Evans D.A; Beukes N.J. & Kirschvink J.L. (1997). "Low-latitude glaciation in the Palaeoproterozoic era". Nature 386 (6622): 262–6. doi:10.1038/386262a0. http://www.nature.com/nature/journal/v386/n6622/abs/386262a0.html.
- Robert E. Kopp et al (2005). "The Paleoproterozoic snowball Earth: a climate disaster triggered by the evolution of oxygenic photosynthesis". Proc. Natl. Acad. Sci. U.S.A. 102 (32): 11131–6. doi:10.1073/pnas.0504878102. PMC 1183582. PMID 16061801. http://www.pnas.org/cgi/reprint/0504878102v1.