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 Montana, USA
 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 - Three Lambeosaurus AKA Orolotitan standing in a shallow river amidst Tempskya and flowering Magnolia; Hadrosaurid; duck-billed dinosaur - Natural History Illustration Geologic Time Scale

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


Lambeosaurus riverside

In a scene 75 million years ago from what's now Montana, a six ton male hadrosaurid dinosaur of the genus Lambeosaurus rears onto its massive hind legs in response to a possible threat, while a female and juvenile Lambeosaurus drink near the river's edge. Lambeosaurus was a plant-eating dinosaur known for its distinctive hollow cranial crest, which in the best-known species resembled a hatchet. The purpose of the crest is unknown.

Also featured here are Late Cretaceous Period flora including tree-like ferns of the genus Tempskya and angiosperms of the genus Magnolia (similar to today's Southern Magnolia). The immediate ancestors to Modern birds were just making their appearance, though avian fossils from this period are rare.




Copyright Walter B. Myers. All rights reserved.

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