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单词 index fossil
释义

index fossil

noun Geology
A fossil that is useful for dating and correlating the strata in which it is found.This ‘dating’ is based on the presence of the ammonite index fossil Dactylioceras tenuicostatum....
  • Possibly the species will prove to be an index fossil for the lower Frasnian and uppermost Givetian of the Sauerland and the Maider in Morocco, ‘Ait Ou Amar’.
  • Stratigraphic occurrences of Carcineretes in the Caribbean Province suggest that this crab should be regarded as an index fossil for the early Maastrichtian.
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更新时间：2026/7/10 23:02:37