Holocene

Holocene

[hol-uh-seen, hoh-luh-]

The Holocene is a geological epoch which began approximately 10,000 years ago (about 8000 BC). According to traditional geological thinking, the Holocene continues to the present. The Holocene is part of the Neogene and Quaternary periods. Its name comes from the Greek words ὅλος (holos, whole or entire) and καινός (kainos, new), meaning "entirely recent". It has been identified with MIS 1 and can be considered an interglacial in the current ice age.

Overview

It is generally accepted that the Holocene started approximately 10 ka (thousand years) Before Present. The period follows the Weichsel glacial. The Holocene can be subdivided into five chronozones based on climatic fluctuations:

  • Preboreal (10 ka – 9 ka),
  • Boreal (9 ka – 8 ka),
  • Atlantic (8 ka – 5 ka),
  • Subboreal (5 ka – 2.5 ka) and
  • Subatlantic (2.5 ka – present).

Human civilization dates almost entirely within the Holocene. 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 have been 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 western civilization. According to some scholars, a third division, the Anthropocene, began in the 18th Century . It is debatable whether this is an age within, or follows, the Holocene epoch.

Geology

Continental motions are less than a kilometre over a span of only 10 ka. 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.

Climate

Although geographic shifts in the Holocene were minor, climatic shifts were very large. Ice core records show that before the Holocene there were global warming and cooling periods, but climate changes became more regional at the start of the Younger Dryas. However, 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 latter date.

The hypsithermal was a period of warming in which the global climate became 0.5–2°C warmer than today. 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 10th–14th 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 Interglacial, 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.

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 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

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

Within the Holocene numerous meteorite events have been recently discovered in Europe, as well as in seas such as the Indian Ocean and near remote Siberia. It has been speculated that an impact effect such as that represented today by the Burckle crater or the Chiemgau Impact crater 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.

Further reading

  • Neil Roberts The Holocene: an environmental history (Blackwell Publishing)
  • Mackay, A.W., Battarbee, R.W., Birks, H.J.B. & Oldfield, F. (2003) Editors. Global change in the Holocene. Publisher: Arnold, London. 528 pp (29 chapters)

See also

References

  • Ogg, Jim; June, 2004, Overview of Global Boundary Stratotype Sections and Points (GSSP's) http://www.stratigraphy.org/gssp.htm Accessed April 30, 2006

External links

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