A length of time equal to a trillionth of an era in geological time, which works out to about a few days. Approximately a thousandth of a nanoera. An outdated term, it is now now replaced by ‘nanoage’, although it may still be seen from time to time.
Usage examples:
Me during the Mini Middle Carnian: Efence (Spaceflight) is the theme of the whole Mini Carnian picoera, which is my alternate name for the Spring Bank Holiday Weekend 2018 because the weather strangely switched to be Carnian weather during these three days, and then switched back once it was over.