If laboratory measurements of rock magnetism are a true record of the direction of the field prevailing during formation or in some other known time interval, they can be used to determine the age of a rock, for correlation purposes, or for study of the thermal or structural history of a rock or rock formation. Examples using the Lundy dike swarm (Bristol channel), the "kylites" and "crinanites" of Ayrshire, Tertiary lavas on Skye, and gabbros in Aberdeenshire are cited and briefly described.

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