Mean atmospheric O2
Geologic Time Scale
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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