T. ELLIOTT; Upper Carboniferous sedimentary cycles produced by river-dominated, elongate deltas. Journal of the Geological Society ; 132 (2): 199–208. doi: https://doi.org/10.1144/gsjgs.132.2.0199
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Coarsening upwards cycles in the upper Carboniferous Bideford Group of north Devon reflect the repeated progradation of riverdominated, elongate deltas. The cycles consist of progradational sequences (large-scale, prodelta to mouth bar coarsening upwards sequences, and major distributary channel sandstones), aggradational sequences (small-scale beach-spit coarsening upwards sequences and fining upwards crevasse channel sequences), and sporadically developed abandonment fades (thin, bioturbated siltstones and a coal horizon). Variations between cycles are governed principally by the location of bar fingers, and axial, lateral and (?) distal bar finger successions are distinguished.