WALTER MYERS / SCIENCE PHOTO LIBRARY WALTER MYERS / SCIENCE PHOTO LIBRARY
Cretaceous marine predators. Computer artwork of three primary marine predators that shared the waters of the Western Interior Seaway of North America 75 million years ago, during the Cretaceous period. Left to right is a non-descript invertebrate pursued by a 4 foot (1.2 metres) long Enchodus, followed by a 17 foot (5 metres) long Dolichorhynchops, followed by a 55 foot (17 metres) long Mosasaur.
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