Timeline of glaciation


Timeline of glaciation

There have been four major periods of glaciation in the Earth's past. The second, and possibly most severe, is estimated to have occurred from 850 Ma to 635 Ma (million years ago, in the late Proterozoic Age) and it has been suggested that it produced a "Snowball Earth" in which the earth iced over completely. It has been suggested also that the end of this cold period was responsible for the subsequent Cambrian Explosion, a time of rapid diversification of multicelled life during the Cambrian era. However, this theory is still controversial. [van Andel, Tjeerd H. (1994) "New Views on an Old Planet: A History of Global Change" 2nd ed. Cambridge University Press, Cambridge, UK, ISBN 0521447550] [ [http://www.gsajournals.org/perlserv/?request=get-pdf&doi=10.1130%2FG23400A.1 Rieu, Ruben "et al." (2007) "Climatic cycles during a Neoproterozoic “snowball” glacial epoch" "Geology" 35(4): pp. 299–302] ]

A minor series of glaciations occurred from 460 Ma to 430 Ma. There were extensive glaciations from 350 to 250 Ma. The current ice age, called the Quaternary glaciation, has seen more or less extensive glaciation on 40,000 and later, 100,000 year cycles. We are currently in an interglacial period, as the last glacial period ended about 10,000 years ago.

Major glacial periods in earth's history

**Table data is based on Gibbard Figure 22.1.

Ice core evidence of recent glaciation

Ice cores are used to obtain a high resolution record of recent glaciation. It confirms the chronology of the marine isotopic stages. Ice core data shows that the last 400,000 years have consisted of short interglacials (10,000 to 30,000 years) about as warm as the present alternated with much longer (70,000 to 90,000 years) glacials substantially colder than present. The new EPICA Antarctic ice core has revealed that between 400,000 and 780,000 years ago, interglacials occupied a considerably larger proportion of each glacial/interglacial cycle, but were not as warm as subsequent interglacials.

References

External Links

*Aber, J.S., 2006, [http://academic.emporia.edu/aberjame/ice/lec17/lec17.htm "Regional Glaciation of Kansas and Nebraska."] Emporia State University, Emporia, Kansas.
*anonymous, 2000, [http://www.emporia.edu/earthsci/gage/pre-wisc/pre-wisc.htm "Pre-Wisconsin Glaciation of Central North America."] Work Group on Geospatial Analysis of Glaciated Environments (GAGE), INQUA Commission on Glaciation, Emporia State University, Emporia, Kansas.
*anonymous, 2007, [http://www.quaternary.stratigraphy.org.uk/correlation/chart.html "Global correlation tables for the Quaternary."] Subcommission on Quaternary Stratigraphy, Department of Geography, University of Cambridge, Cambridge, England
*Gibbard, P.L., S. Boreham, K.M. Cohen and A. Moscariello, 2007, [http://www.quaternary.stratigraphy.org.uk/correlation/POSTERSTRAT_v2007b_small.jpg"Global chronostratigraphical correlation table for the last 2.7 million years v. 2007b."] , jpg version 844 KB. Subcommission on Quaternary Stratigraphy, Department of Geography, University of Cambridge, Cambridge, England
*Hambrey, M.J., and W.B. Harland, eds., 1981. [http://www.aber.ac.uk/~glawww/epgr.htm "Earth's pre-Pleistocene glacial record. "] Cambridge University Press, 1004 + xv pp. (book downloadable as series of PDF files)
*Silva, P.G. C. Zazo, T. Bardají, J. Baena, J. Lario y A. Rosas, 2007, [http://tierra.rediris.es/aequa/publicaciones_archivos/Tabla%20Cronoestigrafica.pdf "Tabla Cronoestratigráfica del Cuaternario aequa."] , PDF version 1.4 MB. asociación española para el estudio del cuaternario (aequa), Departamento de Geología, Universidad de Alcalá Madrid, Spain. (Corelation chart of European Quaternary and cultural stages and fossils)

See also

*Geologic timescale
*Glacial history of Minnesota
*Ice age
*Glacial period
*Last glacial period
*Varanger glaciation
*Brunhes-Matuyama reversal occurred about 780,000 years ago


Wikimedia Foundation. 2010.

Look at other dictionaries:

  • Timeline of geology — Timeline of geology: see also geologic time scale.* c. 1025 Abū Rayhān al Bīrūnī publishes the Kitab fi Tahqiq ma li l Hind ( Researches on India ), in which he discusses the geology of India and hypothesizes that it was once a sea. [A. Salam… …   Wikipedia

  • Timeline of Michigan history — Flag of Michigan Contents 1 Natural history 2 French colonization …   Wikipedia

  • Timeline of environmental events — Expand list|date=August 2008The timeline of environmental events is a historical account of events that have shaped humanity s perspective on the environment. This timeline includes some major natural events, human induced disasters,… …   Wikipedia

  • Quaternary glaciation — The Ice Age redirects here. For other uses, see Ice age (disambiguation). Last ice age redirects here. This term is also used for the last glacial period of the Quaternary glaciation. Northern Hemisphere glaciation during the Last Glacial Maximum …   Wikipedia

  • Kansan glaciation — The Kansan Glaciation (known in the UK as the Anglian glaciation, Elster glaciation in northern Europe, and the Mindel glaciation in the Alps) was a severe glacial period in the Pleistocene. The Kansan Glaciation is generally taken as covering… …   Wikipedia

  • Huronian glaciation — The Huronian glaciation (or Makganyene glaciation) extended from 2400 Mya to 2100 Mya, during the Siderian and Rhyacian periods of the Paleoproterozoic era, triggered by the oxygen catastrophe, which oxidised the atmospheric methane (a greenhouse …   Wikipedia

  • Detailed logarithmic timeline — Main article: logarithmic timeline This timeline allows one to see the whole history of the universe, the Earth, and mankind in one table. Each row is defined in years ago, that is, years before the present date, with the earliest times at the… …   Wikipedia

  • Last glacial period — Last glacial redirects here. For the period of maximum glacier extent during this time, see Last Glacial Maximum. The last glacial period was the most recent glacial period within the current ice age occurring during the last years of the… …   Wikipedia

  • Pre-Illinoian — The Pre Illinoian Stage is often synonymous with Pre Illinoian glacial[1][2] and used by Quaternary geologists for the early and middle Pleistocene glacial and interglacial periods of geologic time in North America from 2.5 Ma 500,000 years ago,… …   Wikipedia

  • Beestonian stage — The Beestonian Stage is the name for an early Pleistocene stage used in the British Isles. It precedes the Cromerian Stage and follows the Pastonian Stage. This stage consists of alternating glacial and interglacial phases instead of being a… …   Wikipedia


Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.