Maastrichtian
Geologic period
The Maastrichtian is, in the ICS geologic timescale, the latest age of the Late Cretaceous Epoch or Upper Cretaceous Series, the Cretaceous Period or System, and of the Mesozoic Era or Erathem. It spanned the interval from 72.1 to 66 million years... Wikipedia
Age: 72.1 million to 66 million years ago
Epoch: Late Cretaceous
Occurred: 72.1 (+/- 0.2) million years ago - 66 million years ago
Chronological unit: Age
Lower boundary definition: Mean of 12 biostratigraphic criteria
