Discussion of basins and swells in the British Jurassic

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Abstract
Some usages by Sellwood & Jenkyns (1975), in particular of the term ‘swell’, are criticized as potentially confusing, and clarification of their proposals regarding the role of basement faulting in controlling sedimentation is sought. Aspects of the palaeogeography of Scotland are stressed as contrasting, notably in strong rejuvenation of source areas during the Jurassic, with the situation described by Sellwood & Jenkyns from southern England. The significance of ‘swells’ is subsequently outlined in terms of assumed structural, topographic and palaeogeographic role. Intra-Jurassic differential fault movements, like those already well known from offshore Britain, are reaffirmed as the probable mechanism governing the nature and sequence of Pliensbachian to Bajocian facies in Britain.