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See also: cretaceous
Specific use of cretaceous.
- (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, New York, N.Y.: Columbia University Press, →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.
geologic period within the Mesozoic