Of or pertaining to the geological formation known as the Wealden (see B.). Wealden lizard = hylaeosaurus, n.

Used attributively with reference to a series of clays of Lower Cretaceous age which outcrop at Speeton.

Of, relating to, or designating the oldest part of the Lower Cretaceous period, or the series of rocks laid down at that time (originally spec.…

Designating the uppermost stage of the Lower Cretaceous (esp. in Europe), above the Aptian and below the Cenomanian; of or relating to this stage.

D'Orbigny's subdivision of the Cretaceous in France and Belgium corresponding to the ‘Upper Chalk with flints’ of British geologists. Also absol.

Forming or belonging to a series of massive limestones of the Lower Cretaceous system as developed at Orgon in the Durance valley.

Name of a stage in the Upper Cretaceous in France and adjacent areas, corresponding to the middle Senonian and to part of the Upper Chalk in…

Of, relating to, or designating a division of the Upper Cretaceous in Europe that is now regarded as the most recent stage of the Cretaceous…

Of, pertaining to, or designating a stratigraphical stage, a division of the Neocomian, which forms part of the Lower Cretaceous. Also absol.

Of or pertaining to the Isle of Wight or the Lower Greensand strata exposed there; spec. (see quot. 1961).

= Urgonian, adj.