... The Paleozoic Era is characterized by the appearance of organisms larger than microscopic size with hard tissue, i.e., chitinous or calcareous skeletal structures (mainly shells), for the first time in the geological era. The Precambrian Era, which lasted for about 3 billion years after life first emerged, was called the Cryptozoic Era because it was populated only by tiny shellless primitive organisms. However, during the last 100 million years or so, large shellless invertebrates developed rapidly (represented by the Ediacara fauna in Australia and the Nectarini fauna in Africa), and some have suggested that this period should be separated as the Eocambrian period, the first period of the Phanerozoic Era, and therefore the first period of the Paleozoic Era. ... From [Geological Age] ...Reign, kingdom, lineage, series, and stage are chronological stratigraphic divisions, while epoch, era, period, era, and period are age divisions. *Some of the terminology explanations that refer to the "Occult Era" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
… 古生代の特色は,地質時代において最初に硬組織hard tissue,すなわちキチン質や石灰質の骨格構造(主として殻)をもつ顕微鏡サイズより大型の生物が出現したことである。それ以前の先カンブリア時代のうち生命が発現してからの約30億年間は,微細な無殻の原始生物ばかりであったため隠生累代と呼ばれる。ただし,その最後の1億年くらいの間には無殻ではあるが,大型の無脊椎動物が急激に発達するので(オーストラリアのエディアカラ動物群,アフリカのナマ動物群が代表的),これを始カンブリア紀Eocambrian periodとして独立させ顕生累代の最初の紀,つまり古生代の第1の紀にしようという意見もある。… 【地質時代】より…累界,界,系,統,階は年代層序区分,累代,代,紀,世,期は年代区分である。 ※「隠生累代」について言及している用語解説の一部を掲載しています。 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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