Tag: dinosaur

Geological Changes Spurred Dino Diversity

Friday, August 3rd, 2012 | Tags: , ,

New duck-billed and horned dinosaur species in western North America evolved at a blistering pace between 70 and 80 million years ago – blistering by evolutionary standards, of course, which means that new species appeared over spans of hundreds of thousands of years rather than millions of years. Later this species growth appears to weaken,

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