LUDEK PESEK / SCIENCE PHOTO LIBRARY LUDEK PESEK / SCIENCE PHOTO LIBRARY
Artist's impression of an Upper Cretaceous landscape. The Upper Cretaceous period extended from 100 to 65 million years ago and is represented by chalk deposits. Great areas of swamp bordered the seas, and on land dinosaurs were dominant. The early stages of the Alpine Orogeny (mountain formation) occurred, advanced flowering plants became important, and warm- blooded mammals saw their earliest beginnings.
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