Late Cretaceous
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The Late Cretaceous is the more recent 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 Cretaceou
Asteroids of only a few kilometers wide can release the energy of millions of nuclear weapons when colliding with planets (artist's impression).
Maastrichtian
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The Maastrichtian is, in the International Commission on Stratigraphy geologic timescale, the latest age of the Late Cretaceous Epoch or Upper Cretaceous Series, the Cretaceous Period or System, and o
Late Cretaceous
…invertebrates also became extinct. Mammalian and bird clades passed through the boundary with few extinctions, and evolutionary radiation from those Maastrichtian clades occurred well past the boundary. Rates of extinction and radiation varied across different clades of organisms. Many scientists hypothesize that…
Rendzina soil on the Maastrichtian Chalk in Kozubów Landscape Park, Poland
Fossil of Hemipneustes leymeriei