You searched for: “biochrons”
biochron (s) (noun), biochrons (pl)
A relatively short-lived fossil flora or fauna: Representative fossil organisms or taxa that distinguish that time are called biochrons.
This entry is located in the following units: bio-, bi-, -bia, -bial, -bian, -bion, -biont, -bius, -biosis, -bium, -biotic, -biotical (page 8) chrono-, chron- (page 2)