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2018 May 2, Mark Carnall, “What is geologic time, and how does it work?”, in The Guardian:
The GSSP for the end of the Cretaceous and the beginning of the Palaeogene is at Oued Djerfane, west of El Kef, Tunisia and is marked with a “golden spike” (Molina et al 2006).
Global Boundary Stratotype Section and Point on Wikipedia.Wikipedia 