Pennsylvanian period
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A geological period. The period when coal was formed in the Appalachian coalfields in North America. Named by HS Williams (1891). It is considered an independent period in North America, but is not recognized internationally. It spans from about 340 million years ago to 286 million years ago, roughly equivalent to the Late Carboniferous Period. It is divided into five eras based on marine strata. Geological Periods [Makoto Kato] Source: Heibonsha World Encyclopedia, 2nd Edition Information |
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地質時代の一つ。北アメリカ，アパラチア炭田の石炭が形成された時代。H.S.ウィリアムズの命名(1891)。北アメリカでは独立した紀とされるが，国際的には認められていない。約3億4000万年前～2億8600万年前で，ほぼ石炭紀後期に相当する。海成層を標準として，五つの世に細分される。地質時代【加藤 誠】
出典 株式会社平凡社世界大百科事典 第２版について 情報 |
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