Scottish National Dictionary (1700–)
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First published 1976 (SND Vol. X, list of scientific terms with Scottish connections).
This entry has not been updated since then but may contain minor corrections and revisions.
SCOURIAN, adj. Referring to the oldest complex of Lewisian gneiss, characterised by pyroxene (1951 Sutton & Watson in Quarterly Jnl. Geol. Soc. CVI. 241), dating from 2600 million years ago.
[From Scourie, Sutherland.]