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- Includes at its base the Plenus Marl Member and the Black Band Member both defined herein. There are many named marl and flint bands throughout t ...dsworth with the higher beds C to H forming the newly proposed formal term Black Band Member (see below). In so doing the Plenus Marl Member as defined in the Northern ...9 KB (1,257 words) - 12:02, 11 June 2014