The breakup of the world-continent Pangea, which began during the Jurassic, continued into the Cretaceous. This led to increased regional differences in floras and faunas between the northern and southern continents.
The end of the Cretaceous brought the end of many previously successful and diverse groups of organisms, such as non-avian dinosaurs and ammonites. The mass extinction at the Cretaceous-Tertiary Boundary cleared the way for those groups that had previously taken secondary roles to come to the forefront.
Related category GEOLOGY AND PLANETARY SCIENCE
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