Purbeckian

views updated May 08 2018

Purbeckian A stage in the British Upper Jurassic and Lower Cretaceous, underlain by the Portlandian and overlain by rocks of the Wealden Beds. The type section is found in southern England and consists of sediments deposited under intertidal to brackish freshwater conditions. See also TITHONIAN; and RYAZANIAN.

A Dictionary of Earth Sciences AILSA ALLABY and MICHAEL ALLABY

Purbeckian

views updated Jun 11 2018

Purbeckian A late Jurassic stage or formation, the type section of which is found in southern England. The sediments were deposited under intertidal to brackish freshwater conditions.

A Dictionary of Plant Sciences MICHAEL ALLABY

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Purbeckian

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