SIRS—In their recent description of newly discovered occurrences of ice-wedge polygons in north-east Scotland, Gemmell and Ralston (1984) concluded that such permafrost features, except perhaps for those in ‘Moraineless Buchan’, were most probably formed during the cold period of the Loch Lomond Stadial. This conclusion appears to rest on an assumption that the earlier period of recession of the main Devensian ice was in general characterised by a 'rapid and substantial warming', thus precluding permafrost activity at that time.
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Armstrong et al. (1985) studied this question.
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