Five lithologic subdivisions are distinguished in the Torridonian strata on Rhum, western Scotland, of which four are assigned to the Diabaig group and the fifth to the Applecross group. Comparison with the Torridonian of Skye and the mainland shows that the Diabaig group sediments form a wedge that thickens from 700 feet at Diabaig to 8,500 feet in Rhum.

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