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However, no decision was made to equate the beginning of the Pleistocene Epoch to the beginning of the Quaternary Period, and indeed the very status of the Quaternary as a period within the geologic time scale had come into question.
The type section for the The most distinctive changes seen during the Quaternary were the advances of ice into temperate latitudes of the Northern Hemisphere.
The glacial landscapes were dominated by ice several kilometres thick that covered all but the highest peaks in the interior.
Less of it has been lost to erosion, and the sediments are not usually altered by rock-forming processes.
Quaternary rocks and sediments, being the most recently laid geologic strata, can be found at or near the surface of the Earth in valleys and on plains, seashores, and even the seafloor.
Land close to the glaciers and affected by the cold temperatures (periglacial landscapes) were areas of permafrost and tundra.
Farther away, vast dry, cold grasslands (steppes) were formed.
In 2005 the ICS decided to recommend keeping the Tertiary and Quaternary in the time scale, but only as informal sub-eras of the Cenozoic.
The ICS abandoned the sub-era structure in 2008, deciding instead to formally designate the Quaternary as the uppermost period of the Cenozoic Era, following the aforementioned Paleogene and Neogene periods.
These deposits are important for unraveling geologic history because they are most easily compared to modern sedimentary deposits.
The environments and geologic processes earlier in the period were similar to those of today; a large proportion of Quaternary Charles Lyell in the 1830s, the Quaternary Period was divided into two epochs, the Pleistocene and the Holocene, with the Pleistocene (and therefore the Quaternary) understood to have begun some 1.8 million years ago.
In 2009 the International Union of Geological Sciences (IUGS) officially ratified the decision to set the beginning of the Quaternary at 2,588,000 years ago, a time when rock strata show extensive evidence of widespread expansion of ice sheets over the northern continents and the beginning of an era of dramatic climatic and oceanographic change.Tags: Adult Dating, affair dating, sex dating