Succession of sediments characterized by the presence of one or more species or taxa. It is the fundamental biostratigraphic unit.
Biozone
A body of rock defined on the basis of its fossil content; where the basic unit is a biozone.
Biostratigraphic unit
Habitat of an animal or plant community to which that community is adapted.
Biotope
That aspect of a rock that is concerned only with its fossil content rather than its lithologic feature.
Biofacies
Life assemblage: A group of animal that lives together.
Biocoenesis