biochron

A biochron (from the Greek bios, life; and khronos, time) is the length of time represented by a biostratigraphic zone. Biochrons are named after characteristic fossil organisms or taxa that characterise that interval in time.{{Cite web |url=https://www.researchgate.net/publication/223233784 |title=Biochronology and biochron boundaries: A real dilemma or a false problem? An example based on the Pleistocene large mammalian faunas from Italy |website=ResearchGate |language=en |access-date=May 10, 2017}}