The total stratigraphical range in which fossil remains of a particular taxon are found, representing the period of its existence; a stratigraphical range defined by the appearance of particular taxa within it.
Origin
Early 20th century. From bio- + zone.
Definition of biozone in US English:
biozone
nounˈbʌɪə(ʊ)zəʊn
Geology
The total stratigraphical range in which fossil remains of a particular taxon are found, representing the period of its existence; a stratigraphical range defined by the appearance of particular taxa within it.