Tethys (geological period) (English spelling)

…At that time, there were no other continents on the Earth, and only this supercontinent had a monotonous distribution of land and sea. Between the two continents, the Tethys Ocean spread like a bay along the equator, where marine organisms such as trilobites and fusulina (spindles) flourished, and it is thought that the sedimentary area that became the basis of the Japanese archipelago was also included in this area. Major crustal movements occurred around the world from the late Silurian to the early Devonian, and from the Carboniferous to the Permian, respectively, and are called the Caledonian and Variscan (Hercynian) orogenies, named after the most representative regions. …

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Source | Heibonsha World Encyclopedia 2nd Edition | Information

…このころ地球上の他の部分には大陸はなく，この超大陸のみの単調な海陸分布となっていた。両大陸の間には赤道沿いにテチスTethys海が湾状に広がり，三葉虫，フズリナ(紡錘虫)をはじめとする海生生物が繁栄し，日本列島のもとになる堆積域もこの範囲に含まれていたと考えられる。　シルル紀後期～デボン紀初期，石炭紀～二畳紀にそれぞれ大きな地殻変動が世界各地で起こり，代表的な地域の名をとって，それぞれカレドニア，バリスカン(ヘルシニアン)造山運動と呼んでいる。…

※「Tethys（地質時代）」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