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	地層がいつ，どこで，どのように形成されたかという成因論的な考察を目的とする新しい層序学の概念。時代を決める年代論，時間と環境の示準（示相）となる古生物学，堆積機構と環境を考察する堆積学，そして堆積盆地の運動等を考察する構造地質学などの分野にまたがる地層の成因を明らかにするための総合的な分析手段である。

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