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Cretaceous vs Rudist - What's the difference?

cretaceous | rudist |

As a proper noun Cretaceous

is the geologic period within the Mesozoic era that comprises lower and upper epochs from about 146 to 65 million years ago.

As an adjective cretaceous

is of or relating to chalk.

As a noun rudist is

any of many box, tube or ring -shaped marine heterodont bivalves from the Jurassic and Cretaceous periods.

cretaceous

English

(wikipedia Cretaceous)

Proper noun

(en proper noun)
  • (geology) The geologic period within the Mesozoic era that comprises lower and upper epochs from about 146 to 65 million years ago
  • *
    • 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.

    See also

    *

    rudist

    English

    Noun

    (rudists) (en noun)
  • Any of many box, tube or ring -shaped marine heterodont bivalves from the Jurassic and Cretaceous periods