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The branch of stratigraphy that is linked to the concept of time. In chronostratigraphy intervals of geological time are referred to as chronomeres. These may be of unequal duration. Intervals of geological time are given formal names and grouped within a Chronomeric Standard hierarchy. The formal terms are: eon, era, period, epoch, age, and chron. Of these, the last four are the equivalent of system, series, stage, and chronozone in the Stratomeric Standard hierarchy. The terms are often written with initial capital letters when accompanied by the proper names of the intervals to which they refer. Some geologists hold that the term ‘chronostratigraphy’ is synonymous with ‘biostratigraphy’, but most agree that the two branches are separate.

Subjects: Biological Sciences.

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