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. ...
(from the article `biozone`) ...the unit in a particular place, on the local stratigraphic range of the fossil plant or animal involved, is called a teilzone. The geological time ...
biochron A relatively short-lived fossil flora or fauna.