Editing Cretaceous Period

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===Terrestrial Fauna===
===Terrestrial Fauna===
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[[File:Tyrannosaurus BW.jpg|thumb|300px|left|Tyrannosaurus Rex, the pereminent Terrastrial Predator of the age]]
[[File:Tyrannosaurus BW.jpg|thumb|300px|left|Tyrannosaurus Rex, the pereminent Terrastrial Predator of the age]]
On land, mammals were a small and still relatively minor component of the fauna. Early marsupial mammals evolved in the Early Cretaceous, with true placentals emerging in the Late Cretaceous period. The fauna was dominated by archosaurian reptiles, especially dinosaurs, which were at their most diverse stage. Pterosaurs were common in the early and middle Cretaceous, but as the Cretaceous proceeded they faced growing competition from the adaptive radiation of birds, and by the end of the period only two highly specialized families remained.
On land, mammals were a small and still relatively minor component of the fauna. Early marsupial mammals evolved in the Early Cretaceous, with true placentals emerging in the Late Cretaceous period. The fauna was dominated by archosaurian reptiles, especially dinosaurs, which were at their most diverse stage. Pterosaurs were common in the early and middle Cretaceous, but as the Cretaceous proceeded they faced growing competition from the adaptive radiation of birds, and by the end of the period only two highly specialized families remained.
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