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Lewisian

Pronunciation: /luːˈɪsɪən/

Definition of Lewisian

adjective

Geology

relating to or denoting the earlier stage of the Proterozoic aeon in NW Scotland, from about 2,500 to 1,100 million years ago, when the oldest rocks in Britain were deposited.
(as noun the Lewisian) the Lewisian stage or the system of rocks deposited during it.