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The Miocene (symbol MI) is the first geological epoch of the Neogene Period and extends from about (Ma). The Miocene was named by Sir Charles Lyell. Its name comes from the Greek words (', “less”) and (', “new”)〔(【引用サイトリンク】publisher=Online Etymology Dictionary )〕 and means "less recent" because it has 18% fewer modern sea invertebrates than the Pliocene. The Miocene follows the Oligocene Epoch and is followed by the Pliocene Epoch. The earth went from the Oligocene through the Miocene and into the Pliocene as it cooled into a series of ice ages. The Miocene boundaries are not marked by a single distinct global event but consist rather of regional boundaries between the warmer Oligocene and the cooler Pliocene. The apes arose and diversified during the Miocene, becoming widespread in the Old World. By the end of this epoch, the ancestors of humans had split away from the ancestors of the chimpanzees to follow their own evolutionary path. As in the Oligocene before it, grasslands continued to expand and forests to dwindle in extent. In the Miocene seas, kelp forests made their first appearance and soon became one of Earth's most productive ecosystems. 〔http://www.bbc.co.uk/nature/history_of_the_earth/Miocene〕 The plants and animals of the Miocene were fairly modern. Mammals and birds were well-established. Whales, seals, and kelp spread. The Miocene is of particular interest to geologists and palaeoclimatologists as major phases of the Himalayan orogeny had occurred during the Miocene affecting monsoonal patterns in Asia, which were interlinked with glaciations in the northern hemisphere. ==Subdivisions== The Miocene faunal stages from youngest to oldest are typically named according to the International Commission on Stratigraphy: Two subdivisions each form the lower, middle and late Miocene. Regionally, other systems are used. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「miocene」の詳細全文を読む スポンサード リンク
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