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.
TORRIDONIAN, adj. Geol. Applied to a series of late Pre-Cambrian arkosic sandstones and conglomerates deposited on Lewisian gneiss (1894 A. Geikie in Annual Report Geol. Survey for 1893 263).
[From Torridon in Rossshire where they occur.]
