The ratification by IUGS of the recently defined base of the Zanclean Stage
and of the Pliocene Series brings years of controversy to an end. The boun
dary-stratotype of the stage is located in the Eraclea Minoa section on the
southern coast of Sicily (Italy), at the base of the Trubi Formation. The
age of the Zanclean and Pliocene GSSP at the base of the stage is 5.33 Ma i
n the orbitally calibrated time scale, and lies within the lowermost revers
ed episode of the Gilbert Chron (C3n.4r), below the Thvera normal subchron.