Definitions for: Cretaceous

[n] from 63 million to 135 million years ago; end of the age of reptiles; appearance of modern insects and flowering plants
[adj] of or relating to the Cretaceous geologic era; "cretaceous rocks"
[adj] abounding in chalk

Webster (1913) Definition: Cre*ta"ceous (kr[-e]*t[=a]"sh[u^]s), a. [L.
cretaceus, fr. creta chalk. See Crayon.]
Having the qualities of chalk; abounding with chalk; chalky;
as, cretaceous rocks and formations. See Chalk.

Cretaceous acid, an old name for carbonic acid.

Cretaceous formation (Geol.), the series of strata of
various kinds, including beds of chalk, green sand, etc.,
formed in the Cretaceous period; -- called also the {chalk
formation}. See the Diagram under Geology.

Cretaceous period (Geol.), the time in the latter part of
the Mesozoic age during which the Cretaceous formation was
deposited.

Cre*ta"ceous, a. Also Cretacic Cre*tac"ic (Geol.)
Of, pertaining to, or designating, the period of time
following the Jurassic and preceding the Eocene.

Synonyms: Cretaceous period

See Also: Age of Reptiles, geological period, Mesozoic, Mesozoic era, period

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