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Zone:A zone includes strata characterised by the overlapping range of fossils.
The zone is the fundamental biostratigraphic unit. Its thickness range from a few to hundreds of metres, and its extant range from local to worldwide. Biostratigraphic units are divided into six principal kinds of biozones:
- Taxon range biozonerepresent the known stratigraphic and geographic range of occurrence of a single taxon.
- Concurrent range biozoneinclude the concurrent, coincident, or overlapping part of the range of two specified taxa.
- Interval biozone include the stata between two specific biostratigraphic surfaces. It can be based on lowest or highest occurrences.
- Lineage biozone are strata containing species representing a specific segment of an evolutionary lineage.
- Assemblage biozones are strata that contain a unique association of three or more taxa.
- Abundance biozone are strata in which the abundance of a particular taxon or group of taxa is significantly greater than in the adjacent part of the section.
Reference: Wikipedia
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