English

Proper noun

Cretaceous

1. (geology) The geologic period within the Mesozoic era that comprises lower and upper epochs from about 146 to 65 million years ago
   • 1992, Rudolf M. Schuster, The Hepaticae and Anthocerotae of North America: East of the Hundredth Meridian, volume V, page 3-4

     As with the Lejeuneaceae, this pattern of massive speciation appears to be correlated with the Cretaceous explosion of the angiosperms and the simultaneous creation of a host of new microenvironments, differing in humidity, light intensity, texture, etc.

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See also

• Appendix:Geologic timescale

English

Adjective

cretaceous ‎(not comparable)

1. Of or relating to chalk.
2. Consisting of chalk.

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