Geologists call this period the 'Late Cretaceous'.

So when it comes down to our end Cretaceous, we have seven left.

Alan, this species of Veriforman has been extinct since the Cretaceous Period. I mean, this thing... What?

Imagine yourself in the Cretaceous period. Here we go. You'd get your first look at this 6foot turkey as you enter a clearing.

All along it was thought to be either an act of God or perhaps long, slow climate change, and that really changed in 1980, in this rocky outcrop near Gubbio, where Walter Alvarez, trying to figure out what was the time difference between these white rocks, which held creatures of the Cretaceous period, and the pink rocks above, which held Tertiary fossils.