Pushing Back Amber Production

@article{Grimaldi2009PushingBA,
  title={Pushing Back Amber Production},
  author={David A. Grimaldi},
  journal={Science},
  year={2009},
  volume={326},
  pages={51 - 52}
}
Amber from 320 million years ago is surprisingly similar to that formed much later by resins from flowering plants. Amber, the fossilized remains of tree resin, was precious and warm to Neolithic peoples, who gathered it from the cold shores of the Baltic Sea at least 13,000 years ago. Deposits of amber from Lebanon preserved insects trapped in it nearly 130 million years ago. On page 132 of this issue, Bray and Anderson (1) report that plants have been making amber for at least 320 million… 
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........................................................................................................................ ii Acknowledgements
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References

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It is found that amber from the Carboniferous, dating to more than 300 million years ago, has a similar chemistry to that of amber from angiosperms that evolved about 150 million years later, demonstrating that preconifer gymnosperms evolved the biosynthetic mechanisms to produce complex polyterpenoid resins earlier than previously believed.
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Carbon-13 nuclear magnetic resonance spectra have been examined under high resolution conditions for 31 samples of fossil resin that have been dated to the Cretaceous period. Samples from Alaska,
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