- cretaceous - abounding in chalk
- cretaceous - of or relating to the Cretaceous geologic era; "cretaceous rocks"
- cretaceous - of or relating to the Cretaceous geologic era; "cretaceous rocks"
- Cretaceous, Cretaceous period - from 135 million to 63 million years ago; end of the age of reptiles; appearance of modern insects and flowering plants
--1 is a kind of period, geological period
--1 is a part of Mesozoic, Mesozoic era, Age of Reptiles