Cretaceous

a.

1.

Having the qualities of chalk; abounding with chalk; chalky; as, cretaceous rocks and formations. See Chalk.

Noun	1.	Cretaceous - from 135 million to 63 million years ago; end of the age of reptiles; appearance of modern insects and flowering plants Synonyms: Cretaceous period
Adj.	1.	cretaceous - abounding in chalk
	2.	cretaceous - of or relating to the Cretaceous geologic era; "cretaceous rocks"

chalk