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| The Holocene epoch is a geological period that extends from the present day back to about 10,000 radiocarbon years, approximately 11,430 ± 130 calendar years BP (between 9560 and 9300 BC). | the HOLOCENE EPOCH |
The Holocene is the fourth and last epoch
of the Neogene period (second epoch
of the
unofficial Quaternary sub-era). Its
name
comes from the Greek words ???? ("holos")
which means whole or entire and ?a???
("kai-ne")
which means new or recent. It has also
been
called the "Alluvium Epoch".
It
has been assigned to MIS 1, which is
an interglacial.
The next glacial is yet to occur. |
In case you had not noticed, you are living in the HOLOCENE EPOCH. This geological time period started basically at the end of the last Ice Age.
Many of the Ice Age animals became extinct during and at the close of the ice age. This included such things as the Probicids (elephants such as Columbian Mammoths, Woolly Mammoths), Mastodons (which were not elephants), and other animals like the Woolly Rhinoceros, Saber Tooth Tiger, Dire Wolf, Irish Elk, Cave Bear, Cave Lion, Giant Hyena, and many others.
The information in the heading above comes from Wikipedia, the free on-line Encyclopedia, as does some of the other information below. You can look up Wikipedia information on the Holocene Epoch at this link http://en.wikipedia.org/wiki/Holocene
Initially to get this page on line, we are copying much of what Wikipedia has online about the Holocene as follows:
Overview
The Holocene starts late in the retreat of
the Pleistocene glaciers.
Human civilization dates entirely to 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.
The Holocene was preceded by the Younger
Dryas cold period, the final part of the
Pleistocene epoch. The end of the Younger
Dryas has been dated to about 11,600 calendar
years BP (9600 BC). However, evidence for
the Younger Dryas is not clear cut anywhere
other than in the Northern Hemisphere.
Paleontologists have defined no faunal stages
for Holocene. If subdivision is necessary,
periods of human technological development
such as Paleolithic, Mesolithic and Neolithic
are usually used.
Geology
Continental motions are negligible over a
span of only 10,000 years—less than a kilometer.
However, ice melt caused world sea levels
to rise about 35 meters (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 meters over
the late Pleistocene and Holocene.
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.
There appears to be a south to north pattern,
with southern latitudes displaying maximum
warming a few millennia before the Northern
Hemisphere regions.
The Holocene climatic optimum 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.
It began roughly 9,000 years ago and ended
about 5,000 years ago, when the earliest
human civilizations in Asia and Africa were
flourishing. This period of warmth ended
with a cooler period with minor glaciation,
which continued until about 2,000 years ago.
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
as severe as previous periods during the
Holocene.
The Holocene warming is an interglacial period
and there is no reason to believe that it
represents a permanent end to the Pleistocene
glaciation. It is thought that the planet
could return to a new period of glaciation
in as little as 3,000 years from now, although
19,000 years is also suggested. However,
if the current global warming continues,
a super-interglacial might occur, and become
warmer and possibly longer than any past
interglacial periods in the Pleistocene.
A super-interglacial could become warmer
than the Eemian Interglacial, which peaked
at roughly 125,000 years ago and was warmer
than the Holocene.
Habitable zones expanded northwards. Large
mid-latitude area such as the Southwestern
United States that were previously productive
became deserts (see Lake Manly). The epoch
started with large lakes in many areas of
the world that are now quite arid.
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 also been explained by the arrival of
the ancestors of Amerindians. Throughout
the world, ecosystems in cooler climates
that were previously regional have been isolated
in higher altitude ecological "islands."
The 8.2ka event is a climatic event thought
to be the most prominent climatic event occurring
in the early Holocene epoch.
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.
Much more will be added, including a number of graphics. Hopefully this will be soon.