For example, reef-building corals that live in tropical and subtropical regions today live only in warm waters where the surface water temperature never falls below 18°C in winter, and only in shallow, transparent waters with depths of less than 50m, forming coral reefs. Because of their strict environmental requirements, the discovery of coral reef fossils allows us to infer that the ancient environment in which the strata containing them were deposited was a warm, shallow sea, and how extensive such an area was. The more strict the environment of the ancient organisms, the more precisely their fossils can determine the ancient environment. *Some of the terminology that refers to "narrow environment" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…たとえば熱帯から亜熱帯にかけて現生する造礁サンゴは,冬季の表層水温が18℃を下回ることのない温暖な海域で,しかも水深がほぼ50m以浅という透明度の高い浅海部に限って生息し,サンゴ礁を形成している。このような狭環境性stenokousのために,サンゴ礁の化石が産出することによって,これらを含む地層が堆積した古環境が温暖な浅海であり,そのような海域がどのように広がっていたかが推定される。このように狭環境性の古生物ほど,その化石により古環境を細かく限定することができる。… ※「狭環境性」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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