Abstract
SUMMARY: Well-log criteria are used to redefine the base of the Late Triassic ‘Winterton Formation’ in the U.K. Southern North Sea Basin. In a cored offshore succession the redefined formation is lithostratigraphically and biostratigraphically correlatable with the Penarth Group of onshore U.K. sequences. It is proposed that the use of the term Penarth Group is extended to the offshore area and that ‘Winterton Formation’ is abandoned.

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