biostratigraphic unit

biostratigraphic unit

[¦bī·ō‚strad·ə′graf·ik ′yü·nət]
(geology)
A stratum or body of strata that is defined and identified by one or more distinctive fossil species or genera without regard to lithologic or other physical features or relations.
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References in periodicals archive ?
Below are the faunal lists for each biostratigraphic unit encountered in the Cenozoic in Wenonah J-75, and in the Oligocene section of Whycocomagh N-90.
extraordinarius Biozone was first established as a local biostratigraphic unit within this area (Koren' & Sobolevskaya 1977, 1979), and the type locality of the zonal species is located on the Ina River (Sobolevskaya 1976).
proteus Zone and conodonts from the underlying Paltodus deltifer Zone and even from older biostratigraphic units.