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From Wikipedia, the free encyclopedia

Subdivisions of the Quaternary Period
System Series Stage Age (Ma)
Quaternary Holocene 0–0.0117
Pleistocene Tarantian (Upper) 0.0117–0.126
Ionian (Middle) 0.126–0.781
Calabrian (Lower) 0.781–1.806
Gelasian (Lower) 1.806–2.588
Neogene Pliocene Piacenzian older
In Europe and North America, the Holocene is subdivided into Preboreal, Boreal, Atlantic, Subboreal and Subatlantic stages of the Blytt-Sernander time scale. There are many regional subdivisions for the Upper or Late Pleistocene, usually these represent locally recognized cold (glacial) and warm (interglacial) periods. The last glacial period ends with the cold Younger Dryas substage.
Holocene Epoch
Preboreal (10.3 ka – 9 ka),
Boreal (9 ka – 7.5 ka),
Atlantic (7.5 ka5 ka),
Subboreal (5 ka2.5 ka)
Subatlantic (2.5 ka – present)

The Holocene is a geological epoch which began approximately 12,000 years ago[1] (10 000 14C years ago). According to traditional geological thinking, the Holocene continues to the present. The word anthropocene is sometimes used to describe the time period from when humans have had a significant impact on the Earth's climate and ecosystems to the present. The Holocene is part of the Quaternary period. Its name comes from the Greek words ὅλος (holos, whole or entire) and καινός (kainos, new), meaning "entirely recent". It has been identified with the current warm period, known as MIS 1, and can be considered an interglacial in the current ice age. Human civilization, in its most widely used definition, dates entirely within the Holocene.



It is generally accepted that the Holocene started approximately 12,000 years BP (before present day), i.e., around 10,000 BCE. The period follows the Wisconsin glaciation (also known as the Baltic-Scandinavian Ice Age or the Weichsel glacial). The Holocene can be subdivided into five time intervals, or chronozones, based on climatic fluctuations:

Note: "ka" means "thousand years" (non-calibrated C14 dates)

The Blytt-Sernander classification of climatic periods defined, initially, by plant remains in peat mosses, is now of purely historical interest. The scheme was defined for north Europe, but the climate changes were claimed to occur more widely. The periods of the scheme include a few of the final, pre-Holocene, oscillations of the last glacial period and then classify climates of more recent prehistory.

Paleontologists have defined no faunal stages for Holocene. If subdivision is necessary, periods of human technological development, such as the Mesolithic, Neolithic, and Bronze Age, are usually used. However, the time periods referenced by these terms vary with the emergence of those technologies in different parts of the world.

Climatically, the Holocene may be divided evenly into the Hypsithermal and Neoglacial periods; the boundary coincides with the start of the Bronze Age in European civilization. According to some scholars, a third division, the Anthropocene, began in the 18th century. [2].


Holocene cinder cone volcano on State Highway 18 near Veyo, Utah.

Continental motions are less than a kilometre over a span of only 10,000 years. However, ice melt caused world sea levels to rise about 35 m (110 ft) in the early part of the Holocene. In addition, many areas above about 40 degrees north latitude had been depressed by the weight of the Pleistocene glaciers and rose as much as 180 m (600 ft) over the late Pleistocene and Holocene, and are still rising today.

The sea level rise and temporary land depression allowed temporary marine incursions into areas that are now far from the sea. Holocene marine fossils are known from Vermont, Quebec, Ontario, and Michigan. Other than higher latitude temporary marine incursions associated with glacial depression, Holocene fossils are found primarily in lakebed, floodplain, and cave deposits. Holocene marine deposits along low-latitude coastlines are rare because the rise in sea levels during the period exceeds any likely upthrusting of non-glacial origin.

Post-glacial rebound in the Scandinavia region resulted in the formation of the Baltic Sea. The region continues to rise, still causing weak earthquakes across Northern Europe. The equivalent event in North America was the rebound of Hudson Bay, as it shrank from its larger, immediate post-glacial Tyrrell Sea phase, to near its present boundaries.


Temperature variations during the Holocene
Paleogeographic reconstruction of the North Sea appr. 9000 years ago during the early Holocene and after the end of the last ice age.

Climate has been fairly stable over the Holocene. Ice core records show that before the Holocene there were global warming after the end of the last ice age and cooling periods, but climate changes became more regional at the start of the Younger Dryas. During the transition from last glacial to holocene, the Huelmo/Mascardi Cold Reversal in the Southern Hemisphere began before the Younger Dryas, and the maximum warmth flowed south to north from 11 000 to 7 000 years ago. It appears that this was influenced by the residual glacial ice remaining in the Northern Hemisphere until the later date.

The hypsithermal was a period of warming in which the global climate became warmer. However, the warming was probably not uniform across the world. This period ended about 5 500 years ago, when the earliest human civilizations in Asia and Africa were flourishing. This period of warmth ended with the descent into the Neoglacial. At that time, the climate was not unlike today's, but there was a slightly warmer period from the 10th14th centuries known as the Medieval Warm Period. This was followed by the Little Ice Age, from the 13th or 14th century to the mid 19th century, which was a period of significant cooling, though not everywhere as severe as previous times during neoglaciation.

The Holocene warming is an interglacial period and there is no reason to believe that it represents a permanent end to the current ice age. However, the current global warming may result in the Earth becoming warmer than the Eemian Stage, which peaked at roughly 125 000 years ago and was warmer than the Holocene. This prediction is sometimes referred to as a super-interglacial.

Compared to glacial conditions, habitable zones have expanded northwards, reaching their northernmost point during the hypsithermal. Greater moisture in the polar regions has caused the disappearance of steppe-tundra.

Ecological developments

Animal and plant life have not evolved much during the relatively short Holocene, but there have been major shifts in the distributions of plants and animals. A number of large animals including mammoths and mastodons, saber-toothed cats like Smilodon and Homotherium, and giant sloths disappeared in the late Pleistocene and early Holocene—especially in North America, where animals that survived elsewhere (including horses and camels) became extinct. This extinction of American megafauna has been explained as caused by the arrival of the ancestors of Amerindians; though most scholars assert that climatic change also contributed, as well as a cometary bolide event over North America which is theorized to have triggered the Younger Dryas.[3]

Throughout the world, ecosystems in cooler climates that were previously regional have been isolated in higher altitude ecological "islands."

The 8.2 ka event, an abrupt cold spell recorded as a negative excursion in the δ18O record lasting 400 years, is the most prominent climatic event occurring in the Holocene epoch, and may have marked a resurgence of ice cover. It is thought that this event was caused by the final drainage of Lake Agassiz, which had been confined by the glaciers, disrupting the thermohaline circulation of the Atlantic.[4]

Human developments

The beginning of the Holocene corresponds with the beginning of the Mesolithic age in most of Europe; but in regions such as the Middle East and Anatolia with a very early neolithisation, Epipaleolithic is preferred in place of Mesolithic. Cultures in this period include: Hamburgian, Federmesser, and the Natufian culture.

Both are followed by the aceramic Neolithic (Pre-Pottery Neolithic A and Pre-Pottery Neolithic B) and the pottery Neolithic.

Impact events

Many meteorite events which occurred in the Holocene have recently been discovered in Europe, as well as in seas such as the Indian Ocean and near remote Siberia (Tunguska event). It has been speculated that an impact effect such as that represented today by the Burckle crater[5] or the Chiemgau Impact crater[6] could have dramatically affected human culture in its early history by the creation of megatsunamis, perhaps inspiring deluge or inundation stories such as that of Noah's Flood. A washout effect from such waves may have breached land bridges with sudden massive erosion, along with violent weather changes. Competing reasons for the various basin floods also include climate change and earthquake fault lines weakening the barriers to ocean encroachment.

See also


Further reading

  • Roberts, Neil (1998), The Holocene: an environmental history (2nd ed.), Malden, MA: Blackwell, ISBN 0631186379 
  • Mackay, A. W.; Battarbee, R. W.; Birks, H. J. B. et al., eds. (2003), Global change in the Holocene, London: Arnold, ISBN 0340762233 

External links

Pleistocene Holocene
Early | Middle | Late Preboreal | Boreal |
Atlantic | Subboreal | Subatlantic

1911 encyclopedia

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Up to date as of January 15, 2010

Definition from Wiktionary, a free dictionary

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  1. (geology) Of a geologic epoch within the Neogene period from about 11,000 years ago to the present; the age of man.



  1. (geology) The Holocene epoch.

See also

Simple English

File:Holocene Temperature
Temperature variations during the Holocene

[[File:|thumb|Paleogeographic reconstruction of the North Sea appr. 9000 years ago during the young Holocene and after the end of the last ice age.]] The Holocene is the present geological epoch. It is also called the Recent epoch. It is the second stage in the Quaternary period.

The Holocene marks the end of the previous series of ice ages in the Pleistocene. It started about 11,500 years ago.[1]

During the early Holocene, there were many extinctions amongst larger mammals. This is attributed to a combination of human hunting and climate change.[2][3]


  1. International Stratigraphic Chart International Commission on Stratigraphy [1]
  2. Roberts, Neil 1998. The Holocene: an environmental history. 2nd ed, Blackwell, Malden, MA. ISBN 0-631-18637-9
  3. Mackay A.W. Battarbee R.W. Birks H.J.B. et al eds 2003. Global change in the Holocene. Arnold, London. ISBN 0-340-76223-3

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