Week02_Holocene

Week02_Holocene - WEEK 2: Holocene Epoch The Holocene epoch...

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WEEK 2: Holocene Epoch The Holocene epoch is a geological period, which began approximately 11,550 calendar years BP (about 9600 BC) and continues to the present. The Holocene is part of the Neogene and Quaternary periods. Its name comes from the Greek words meaning "entirely recent". It can be considered an interglacial in the current ice age. Human civilization dates entirely within the Holocene. 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. The geology word for the time since the last ice age. Geology Continental motions are less than a kilometer over a span of only 10 ka. However, ice melt caused world sea levels to rise about 35 m 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 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. The rise in sea level in feet at end of the last ice age. Maximum post-glacial rebound in feet at end of last ice age. Holocene temperatures http://en.wikipedia.org/wiki/Image:Holocene_Temperature_Variat ions.png 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. The hypsithermal was a period of warming in which the global climate became 0.5–2°C warmer than today.
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Week02_Holocene - WEEK 2: Holocene Epoch The Holocene epoch...

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