Biostratigraphic units or biozones are intervals of geological strata that are defined on the basis of their characteristic fossil taxa. A biostratigraphic unit may be defined on the basis of a single taxon or combinations of taxa, on relative abundances of taxa, or variations in features related to the distribution of fossils. The same strata may...
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http://en.wikipedia.org/wiki/Biozone
stratigraphic unit consisting of all the strata containing a particular fossil and, hence, deposited during its existence. The extent of the unit in ... [14 related articles]
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http://www.britannica.com/eb/a-z/b/67
biozone 1. In terms of time, the period of existence of a species. 2. In lithic terms, an abstract zone that includes all strata deposited during the period of time that a given taxon lived. 3. The range of a single taxonomic entity in geologic time as reflected by its occurrence in fossiliferous rocks.
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http://www.wordinfo.info/words/index/info/view_unit/2819/31
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