Field work on Mull island, off the west coast of Scotland, and particularly in the area of Auchnacraig peninsula on the eastern side, has revealed marked angular discordances between Mesozoic sediments and overlying Tertiary lavas. The angular difference is as much as 60 degrees, which precludes its being an original feature. Extensive rotational faulting is ruled out by the absence of other indications. A possible explanation is that the lavas were erupted onto an area of eroded and steeply dipping country rock and that folding movements peripheral to the volcanic center occurred before and after eruption.

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