Cretaceous

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Cretaceous

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Specific use of cretaceous.

• IPA^(key): /kɹəˈteɪ.ʃəs/

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• Rhymes: -eɪʃəs

Cretaceous

1. (geology) The geologic period within the Mesozoic era that comprises lower and upper epochs from about 146 to 66 million years ago.
   • 1992, Rudolf M[athias] Schuster, The Hepaticae and Anthocerotae of North America: East of the Hundredth Meridian, volume V, Chicago, Ill.: Field Museum of Natural History, →ISBN, pages 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.

• end-Cretaceous

• Appendix:Geologic timescale