Geologic dating definition

Posted by / 14-Jun-2016 14:52

Geologic dating definition

However, ice melt caused world sea levels to rise about 35 m (115 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 (590 ft) due to post-glacial rebound over the late Pleistocene and Holocene, and are still rising today.

The Subcommission on Quaternary Stratigraphy quotes Gibbard and van Kolfschoten in Gradstein Ogg and Smith in stating the term 'Recent' as an alternative to Holocene is invalid and should not be used and also observe that the term Flandrian, derived from marine transgression sediments on the Flanders coast of Belgium has been used as a synonym for Holocene by authors who consider the last 10 000 years should have the same stage-status as previous interglacial events and thus be included in the Pleistocene.

The International Commission on Stratigraphy however considers the Holocene an epoch following the Pleistocene and specifically the last glacial period.

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. 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 the last glacial to the 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.

This was followed by the Little Ice Age, from the 13th or 14th century to the mid-19th century, which was a period of cooling.Paleontologists have not defined any 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.The scheme was defined for Northern 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.

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