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Location
 North America
 75 million years ago

Mean atmospheric O2
 150% of modern level

Mean atmospheric CO2
 6x pre-industrial level

Mean temperature
 4C above modern level

Mesozoic Earth - A Cretaceous underwater scene featuring an Enchodus, Dolichorhynchops and Mosasaur - Natural History Illustration Geologic Time Scale

 Era: Mesozoic
  Period: Cretaceous
   Epoch: Late
    Age: Campanian

     
 

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).

 

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Copyright Walter B. Myers. All rights reserved.

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