Stratigraphic Zone

the stratigraphic unit next in rank below a stage and including beds corresponding to the period of the existence of a distinctive group of fossils not found in overlying and underlying deposits. The stratigraphic zone is named after one or two of the most characteristic fossil types of the given group. Many zones are local but some have been identified on several continents and are worldwide, for example, the zones established in the Ordovician and Silurian on evidence of graptolites; in the Mesozoic, of ammonites; and in the Cretaceous, Paleogene, and Neocene, of planktonic foraminifera and nannoplankton.

单词	stratigraphic zone
释义	Stratigraphic Zone Stratigraphic Zone the stratigraphic unit next in rank below a stage and including beds corresponding to the period of the existence of a distinctive group of fossils not found in overlying and underlying deposits. The stratigraphic zone is named after one or two of the most characteristic fossil types of the given group. Many zones are local but some have been identified on several continents and are worldwide, for example, the zones established in the Ordovician and Silurian on evidence of graptolites; in the Mesozoic, of ammonites; and in the Cretaceous, Paleogene, and Neocene, of planktonic foraminifera and nannoplankton.
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