Paleobiology

unit in chronostratigraphy

boundary of a stage on the geologic time scale

thumb|right|Brachiopods and [[bryozoans in an Ordovician limestone, southern Minnesota]] Paleobiology (or palaeobiology) is an interdisciplinary field that combines the methods and findings found in both the earth sciences and the life sciences. An investigator in this field is known as a paleobiologist.

A chronozone or chron is a unit in chronostratigraphy, defined by events such as geomagnetic reversals (magnetozones), or based on the presence of specific fossils (biozone or biochronozone). According to the International Commission on Stratigraphy, the term "chronozone" refers to the rocks formed during a particular time period, while "chron" refers to that time period.

substance produced by life processes; it may be either constituents, or secretions, of plants or animals