Algonkian - Argonkian

Japanese: アルゴンキアン - あるごんきあん
Algonkian - Argonkian

…In North America, unmetamorphosed or weakly metamorphosed strata were found that covered Archean gneisses and granites and were covered by Cambrian strata. In 1889, C. D. Walcott named this geological system the Algonkian. In the 20th century, the Archean and Proterozoic eras, which divided the Precambrian era, came to be used as synonyms for Archean and Algonkian, following the geological division of the Paleozoic, Mesozoic, and Cenozoic eras. …

*Some of the terminology explanations that mention "Algonkian" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…北米大陸で,太古代の片麻岩や花コウ岩をおおい,カンブリア紀の地層におおわれている,非変成または変成度の弱い地層が見いだされた。1889年にC.D.ウォルコットによってそれらの地質系統がアルゴンキアンAlgonkianと命名された。20世紀になってから,古生代,中生代,新生代の地史区分にならって,先カンブリア時代を二分した始生代と原生代が太古代とアルゴンキアンの同義語として使われるようになった。…

※「アルゴンキアン」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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