About 55 million years ago, the Northern Hemisphere was the site of a major evolutionary makeover: Modern groups of mammals like the ancestors of the horse, deer, goats, primates, and opossumlike ...
Sixty-six million years ago, in the wake of the Deccan volcanism that probably spelled the end for non-avian dinosaurs, a rich assemblage of plants, including ferns and mangroves, thrived and ...
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