Enamel That Records Weather

Enamel That Records Weather[nationalgeographic.com]Apr 25, 2011
    Sea Cows from 50 million years ago have a different ration of Oxygen 16 to Oxygen 18 in their enamel than do sea cows from today. What this means is that it was warmer, muggier and there was much more precipitation 50 million years ago than today.

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