Designating a series of (chiefly sedimentary) rocks occurring in south-eastern Canada and the processes and periods in which they were formed; of or…

Of, pertaining to, or characteristic of Lewis: applied to the earlier of the two main groups of Pre-Cambrian rocks in NW. Scotland. Also absol., the…

Of or pertaining to crystalline rocks of Pre-Cambrian age (see quots.). Also elliptical as n.

Used attributively to designate Torridonian rocks (see Torridonian, adj.), which are well exposed at Loch Torridon.

Of, pertaining to, or designating the most recent division of the Proterozoic in North America, as represented by rocks in the region of the Great…

Designating a thick sequence of volcanic rocks of Precambrian age with outcrops in several areas in south-western Wales.

Of, relating to, or characteristic of the Malvern Hills; spec. (a) designating a Precambrian series of plutonic rocks that forms most of the…

Designating a thick series of Late Precambrian sedimentary rocks whose main outcrop forms the hills of the Long Mynd in southern Shropshire.

Of, pertaining to, or designating the later of the two main series of Pre-Cambrian rocks in NW. Scotland, which occur in a narrow belt running…

Of, relating to, or designating the Moine Series (see Moine, n.).

Of, pertaining to, or designating the later metamorphism undergone by the Lewisian rocks of the Precambrian in north-west Scotland, the rocks…