- Now Rare containing, composed of, or having the nature of, chalk
- designating or of the third and last geologic period of the Mesozoic Era, characterized by the formation of huge oil and chalk deposits, the development of the first flowering plants and placental mammals, and the extinction of toothed birds, ammonites, and dinosaurs
Origin of cretaceousClassical Latin cretaceus ; from creta: see crayon
the Cretaceous Period or its rocks
- Of, relating to, or being the period of geologic time from about 145 to 65 million years ago, the third and most recent period of the Mesozoic Era. The Cretaceous Period is characterized by the formation of modern continents from the supercontinent Pangaea and by the development of flowering plants. The Period ended with the sudden extinction of the dinosaurs and many other forms of life. See Table at geologic time.
- cretaceous Of, containing, or resembling chalk.
The Cretaceous Period.
Origin of CretaceousFrom Latin cr&emacron;taceus, chalky, from cr&emacron;ta, chalk, from Cr&emacron;ta (terra), Cretan (earth).
- Of or relating to chalk.
- Consisting of chalk.
From Latin crēta (“chalk”) + -āceus