MARINE LIFE DURING THE PALEOGENE PERIOD
Not only the dinosaurs went extinct 65 million years ago; so did their vicious marine cousins, the mosasaurs, along with the last remaining plesiosaurs and pliosaurs. This sudden vacuum at the top of the aquatic food chain naturally spurred the evolution of sharks (which had already been around for hundreds of millions of years, though in smaller sizes).
Mammals had yet to venture fully into the water, but the earliest, land-dwelling ancestors of whales prowled the Paleogene landscape, most notably in central Asia.
Not only the dinosaurs went extinct 65 million years ago; so did their vicious marine cousins, the mosasaurs, along with the last remaining plesiosaurs and pliosaurs. This sudden vacuum at the top of the aquatic food chain naturally spurred the evolution of sharks (which had already been around for hundreds of millions of years, though in smaller sizes).
Mammals had yet to venture fully into the water, but the earliest, land-dwelling ancestors of whales prowled the Paleogene landscape, most notably in central Asia.
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