Late Cretaceous

The Late Cretaceous (100.5–66 Ma) is the younger of two epochs into which the Cretaceous Period is divided in the geologic time scale. Rock strata from this epoch form the Upper Cretaceous Series. The Cretaceous is named after creta, the Latin word for the white limestone known as chalk. The chalk of northern France and the white cliffs of south-eastern England date from the Cretaceous Period.[3]

Late/Upper Cretaceous
100.5 – 66.0 Ma
Chronostratigraphic nameUpper Cretaceous
Geochronological nameLate Cretaceous
Name formalityFormal
Usage information
Celestial bodyEarth
Regional usageGlobal (ICS)
Time scale(s) usedICS Time Scale
Chronological unitEpoch
Stratigraphic unitSeries
Time span formalityFormal
Lower boundary definitionFAD of the Planktonic Foraminifer Rotalipora globotruncanoides
Lower boundary GSSPMont Risoux, Hautes-Alpes, France
44.3925°N 5.5119°E / 44.3925; 5.5119
GSSP ratified2002[2]
Upper boundary definitionIridium enriched layer associated with a major meteorite impact and subsequent K-Pg extinction event.
Upper boundary GSSPEl Kef Section, El Kef, Tunisia
36.1537°N 8.6486°E / 36.1537; 8.6486
GSSP ratified1991

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