Towards a unified Kimmeridgian Stage

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Abstract
Considerable confusion exists in the interpretation of the term Kimmeridgian. As the Kimmeridge Clay Formation is the principal source rock in the northern North Sea, this confusion has important implications for geoscientists working there. The source of the confusion is historical, but the introduction of the Bolonian Stage as a local secondary standard stage would result in a Kimmeridgian Stage of uniform length, no matter whether a company preferred to use Volgian or Portlandian as the terminal Jurassic Stage. The resolution of this ambiguity will be welcomed by all.

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