Definitions for "Cretaceous period"
Keywords:  mesozoic, ago, era, dinosaur, million
Time interval in the geologic time scale spanning from about 140 to 65 million years ago. Last period of the Mesozoic Era.
The youngest of the three geologic periods of the Mesozoic Era of Earth's history, extending from approximately 145 to 65 Ma ago.
from 135 million to 63 million years ago; end of the age of reptiles; appearance of modern insects and flowering plants