Die Unterkreide ist ein Zeitabschnitt der Erdgeschichte innerhalb der Kreide. Das Ende der Kreidezeit vor rund 66 Millionen Jahren ist durch ein weltweites Massenaussterben, das fast alle Tier- und viele Pflanzengruppen erfasste, gekennzeichnet. Die Ursache war möglicherweise ein Asteroideneinschlag.
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