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I detected some differences in info between each of the two 50K geol map sheets and the BGS on-line lexicon, which may be accounted for by different publication dates. The upper boundary of the group, its extent in time and the relationship of the Llanrian Volc Formation to the rest need clarification. cheers Geopersona (talk) 06:07, 19 January 2012 (UTC)[reply]