The
Holocene is a
geological epoch which began 11,700 years ago (around 10 000
14C years ago) and continues to the present. The Holocene is part of the
Quaternary period. Its name comes from the
Greek words (
holos, whole or entire) and (
kainos, new), meaning "entirely recent". It has been identified with the current warm period, known as
MIS 1 and based on that past evidence, can be considered an
interglacial in the
current ice age.
The Holocene also encompasses within it the growth and impacts of the human species world-wide, including all its written history and overall significant transition toward urban living in the present. Given these, a new term Anthropocene, is specifically proposed and used for the time period since approximately synchronous lithospheric evidence, or more recently atmospheric evidence, of human impacts have been found on the Earth and its ecosystems; these impacts may be considered of global significance for future evolution of living species.
Overview
It is generally accepted that the Holocene started approximately 12,000 years BP
(before present day), i.e., around 10,000 BC. 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:
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).
:
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 the 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.
Geology
Continental motions due to
plate tectonics 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) due to
post-glacial rebound 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 tectonic uplift 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==
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 was 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 Africa and Asia were just beginning to rise. 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 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.
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
Many
meteorite events which occurred in the Holocene have 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 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.
See also
8.2 kiloyear event
Blytt-Sernander
Deluge (prehistoric)
Holocene calendar – used to date geological, archaeological, dendrochronological and historical events from the approximate beginning of the Holocene Epoch
Holocene extinction
Holocene Impact Working Group
Neolithic Subpluvial
Older Peron
Piora Oscillation
10th millennium BC
Last Glacial Maximum
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
Further reading
External links
The 8.2 ka event
Detecting Holocene changes in thermohaline circulation
Category:Quaternary
