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 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.
The length of time represented by a biostratigraphic zone is called a biochron.
WUJIAJIANIA SUTHERLANDI FAUNA (ELVINIA BIOZONE, PAIBIAN STAGE, FURONGIAN SERIES-"UPPER" CAMBRIAN) FROM THE EMIGRANT FORMATION, NEVADA
Jul 01, 2007; INTRODUCTION FOSSILS FROM the Emigrant Formation of Nevada are rare despite the geologic time (uppermost Lower Cambrian to Lower...
Biozone Pharmaceuticals, Inc. Files SEC Form 10-Q, Quarterly Report [Sections 13 or 15(D)] [Amend] (Sept. 6, 2012)
Sep 24, 2012; By a News Reporter-Staff News Editor at Pharma Business Week -- According to news reporting originating from Washington, D.C., by...