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Definition of Portlandian in English:
Portlandian
adjective
GeologyOf, relating to, or designating the uppermost division of the Jurassic of Europe, in which Portland oolite occurs, sometimes regarded as a stage lying above the Kimmeridgian.
noun
GeologyThe Portlandian stage or series of rocks. Chiefly with the.
Origin
Mid 19th century; earliest use found in The North British Review. From the name of Portland + -ian, after Portland oolite.
