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http://www.sciencenews.org/view/access/id/48227
Resin arising
View larger version | Most amber coveted for its jewel-like qualities is from flowering plants, which arose around 140 million years ago, and conifers, which arose around 280 million years ago.
Credit: Graphic: B. Rakouskas; Photos: D. Grimaldi, Tam Nguyen/American Museum of Natural History


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