System (period) Series (epoch) Stage (age) Lower boundary, Ma
Paleogene Paleocene Danian 66,0
Cretaceous Upper (Late) Maastrichtian Golden spike72.1±0.2
Campanian Golden spike83.6±0.2
Santonian Golden spike86.3±0.5
Coniacian Golden spike89.8±0.3
Turonian Golden spike93.9
Cenomanian Golden spike100.5
Lower (Early) Albian Golden spike~113.0
Aptian ~121.4
Barremian Golden spike125.77
Hauterivian Golden spike~132.6
Valanginian ~139.8
Berriasian ~145.0
Jurassic Upper Tithonian older
Subdivisions and "golden spikes" according to IUGS as of September 2023[1]
220px-Turonian Jerusalem Stone 031612

220x220pxLithographic limestone from the Gerofit Formation (Turonian) north ofMakhtesh Ramon, southern Israel; a variety of Jerusalem stone (meleke)

The Turonian is, in the ICS' geologic timescale, the second age in the Late Cretaceous epoch, or a stage in the Upper Cretaceous series. It spans the time between 93.9 ± 0.8 Ma and 89.8 ± 1 Ma (million years ago). The Turonian is preceded by the Cenomanian stage and underlies the Coniacian stage.[1]

At the beginning of the Turonian ananoxic event took place which is called the Cenomanian-Turonian boundary event or the "Bonarelli Event".