Discussion
................................. zone is a body of strata in which the maximum abundance of a particular species is found, though not its total range.
Answer: B
This is an acme zone.
An acme zone (abundance zone or peak zone) is a body of strata in which a particular taxon is most abundant, regardless of how far above and below that interval the taxon also occurs. It marks the peak of the species' abundance, not its whole range.
A range zone covers the total stratigraphic range of a taxon. An assemblage zone is defined by a distinctive association of several taxa, and a concurrent range zone by the overlapping ranges of two or more taxa.
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