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Pliocene
The Pliocene (; also Pleiocene) Epoch (symbol PO) is the period in the geologic timescale that extends from 5.333 million to 2.58〔(See the 2014 version of the ICS geologic time scale )〕 million years BP. It is the second and youngest epoch of the Neogene Period in the Cenozoic Era. The Pliocene follows the Miocene Epoch and is followed by the Pleistocene Epoch. Prior to the 2009 revision of the geologic time scale, which placed the 4 most recent major glaciations entirely within the Pleistocene, the Pliocene also included the Gelasian stage, which lasted from 2.588 to 1.806 million years ago, and is now included in the Pleistocene.
As with other older geologic periods, the geological strata that define the start and end are well identified but the exact dates of the start and end of the epoch are slightly uncertain. The boundaries defining the Pliocene are not set at an easily identified worldwide event but rather at regional boundaries between the warmer Miocene and the relatively cooler Pliocene. The upper boundary was set at the start of the Pleistocene glaciations.
==Etymology==
The Pliocene was named by Sir Charles Lyell. The name comes from the Greek words (''pleion'', "more") and (''kainos'', "new")〔(【引用サイトリンク】url=http://www.etymonline.com/index.php?term=Pliocene&allowed_in_frame=0 )〕 and means roughly "continuation of the recent", referring to the essentially modern marine mollusc faunas. H.W. Fowler called the term (along with other examples such as ''pleistocene'' and ''miocene'') a "regrettable barbarism" and an indication that even "a good classical scholar" such as Lyell should have requested a philologist's help when coining words.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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