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Line 18: {{main\|Quaternary glaciation\|timeline of glaciation}} [[File:Co2 glacial cycles 800k.png\|320px\|thumb\|Glacial and [[interglacial]] cycles as represented by atmospheric [[carbon dioxide\|CO<sub>2</sub>]], measured from ice core samples going back 800,000 years. The stage names are part of the North American and the European Alpine subdivisions. The correlation between both subdivisions is tentative.]] Within the [[Quaternary]], which started (about 2.6 [[~~annum\|Ma]]~~million toyears ~~present)~~ago]], there have been a number of glacials and interglacials.<ref name="Gibbard">{{cite book \|author1=Gibbard, P. \|author2=van Kolfschoten, T. \|chapter=Chapter 22: The Pleistocene and Holocene Epochs \|chapter-url=http://www-qpg.geog.cam.ac.uk/people/gibbard/GTS2004Quat.pdf \|editor1=Gradstein, F. M. \|editor2=Ogg, James G. \|editor3=Smith, A. Gilbert \|title=A Geologic Time Scale 2004 \|publisher=Cambridge University Press \|location=Cambridge \|year=2004 \|isbn=978-0-521-78142-8 }}</ref> At least eight glacial cycles have occurred in the last 740,000 years alone.<ref>{{Cite journal \| last = Augustin \| first = Laurent \| title = Eight glacial cycles from an Antarctic ice core \| journal = Nature \| volume = 429 \| issue = 6992 \| pages = 623–8

Glacial period: Difference between revisions