The biostratigraphic unit being a taxa or faunal assemblage.
2.
The principle of faunal succession is used in biostratigraphy to determine each biostratigraphic unit, or biozone.
3.
They have also attempted to convert some of the intervals, including the Clarkforkian age / stage, into biostratigraphic units.
4.
The diversity of life forms did not increase greatly because of a series of mass extinctions that define widespread biostratigraphic units called " biomeres ".
5.
The same strata may be zoned differently depending on the diagnostic criteria or fossil group chosen, so there may be several, sometimes overlapping, biostratigraphic units in the same interval.
6.
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.
7.
In Cenozoic strata, fossilized tests of foraminifera are often used to determine faunal succession on a refined scale, each biostratigraphic unit ( biozone ) being a geological stratum that is defined on the basis of its characteristic fossil taxa.
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