a hard, semi-metamorphosed limestone obtained from Purbeck, used in building and paving; (also) a paving stone made of Purbeck stone.

Geology. Of, relating to, or designating a division of the Upper Jurassic strata lying below the Kimmeridgian and above the Callovian (in continental…

Of, relating to, or designating the uppermost division of the Jurassic of Europe, in which Portland oolite occurs, sometimes regarded as a stage…

Designating a stage of the Jurassic between the Oxfordian in the Upper Jurassic and the Bathonian in the Middle Jurassic; of or relating to this…

Also Kimeridgian. The specific epithet of that subdivision of the Upper Oolite which is prominent at Kimmeridge. Hence, of or pertaining to this…

Geology. Denoting a subdivision of the Jurassic, of which the formations at Bath are typical.

Of, pertaining to, or designating a stage of the Lower Jurassic in Europe which in the modern division is next below the Pliensbachian. Frequently a…

Designating the uppermost stage of the Upper Jurassic; of or relating to this stage.

Applied to a series of strata corresponding in position to the Upper Lias of England, which are extensively developed in Central and Southern France.

= Callovian, adj. n.

Designating this stage and age; of or relating to this stage.

Of or relating to the Pliensbachian.