Mean atmospheric O2
Geologic Time Scale
Cretaceous marine predators
Three primary marine predators that shared the ocean waters of the Western Interior Seaway of North America 75 million years ago are illustrated here. Left to right is a non-descript invertebrate pursued by a four-foot-long bony fish of the genus Enchodus, followed by a 17-foot-long polycotylid plesiosaur of the genus Dolichorhynchops, followed by a 55-foot-long marine reptile of the family Mosasauridae (AKA Mosasaur).
Copyright © Walter B. Myers. All rights reserved.
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