Known to be when dinosaurs dominated the land, Paleogene Period came before the cretaceous period.
A extra handy trendy definition could move some thing like this: Dinosaurs are extinct animals with upright limbs that lived on land all through the Mesozoic generation (252 to sixty-six million years in the past).
Dinosaurs are archosaurs, a larger group of reptiles that first seemed approximately 251 million years in the past, near the begin of the Triassic duration. a few other non-dinosaur reptiles also are archosaurs, including pterosaurs (the now-extinct flying reptiles) and cutting-edge crocodiles and their ancestors.
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