P. C. RICHARDS, S. BROWN, J. M. DEAN, R. ANDERTON; A new palaeogeographic reconstruction for the Middle Jurassic of the northern North Sea. Journal of the Geological Society ; 145 (6): 883–886. doi: https://doi.org/10.1144/gsjgs.145.6.0883
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An estuarine sequence equivalent in age to the Brent Group deltaic deposits further north is recognized in the central Viking Graben. It indicates a persistent marine connection southwards from the Boreal Ocean during deltaic accumulation, and suggests that the Brent delta did not prograde from the south, along the graben as previously suggested. Evidence from the UK north Viking Graben indicates the Brent delta was probably derived transversely rather than axially, as were the other Jurassic clastic systems infilling the graben.