De KT-boundary

Across the world, the end of the Cretaceous era (65 million years ago) is a particularly spectacular event: In the blink of an eye, geologically speaking, 60% of all species then living went extinct: unicellular Foraminifers mid-range Ammonites and Belemnites. and virtually the entire spectrum of toothed birds and reptiles: terrestrial, flying and marine –Mosasaurs included

Flying reptiles and toothed birds disappeared too. On the continents none of the animals weighing more than 25 kg survived: the era of the giant reptiles had come to an end. This massive extinction marks the end of the Cretaceous. All over the world, the boundary is distinguishable as a conspicuous clay layer. This layer has also been identified in southern Limburg.

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