Chalk period

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(Geol.)

See Cretaceous period, under Cretaceous.

See also: Chalk

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For instance, the several species of the Chthamalinae (a sub-family of sessile cirripedes) coat the rocks all over the world in infinite numbers: they are all strictly littoral, with the exception of a single Mediterranean species, which inhabits deep water and has been found fossil in Sicily, whereas not one other species has hitherto been found in any tertiary formation: yet it is now known that the genus Chthamalus existed during the chalk period.

The Origin of Species by Darwin, Charles View in context

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Chalk drawing
chalk dust
Chalk formation
chalk line
Chalk mixture
chalk number
chalk out
Chalk period
chalk pit
chalk talk
chalk troops
chalk up
chalkboard
Chalkcutter
chalkface

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