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Here is the latest American Chemical Society (ACS) News Service Weekly PressPac with news from ACS 36 peer-reviewed journals and Chemical & Engineering News. Please credit the individual journal or the American Chemical Society as the source for this information.

ALL CONTENT IS FOR IMMEDIATE USE EXCEPT ARTICLE #5, which is embargoed for 9 A. M., Eastern Time, Jan. 7, 2008.

Amber fossils reveal ancient France was a jungle
The Journal of Organic Chemistry

Research on a treasure trove of amber has yielded evidence that France once was covered by a dense tropical rainforest with trees similar to those found in the modern-day Amazon. The report on 55-million-year-old pieces of amber from the Oise River area in northern France is scheduled for the Jan. 4 issue of ACS Journal of Organic Chemistry, a biweekly publication.

In the new study, Akino Jossang and colleagues used laboratory instruments to analyze the fossilized tree sap in an effort to link specific samples of amber to specific kinds of trees. The amber remained intact over the ages, while the trees from which it oozed disappeared. Efforts to make such connections have been difficult because amber from different sites tended to have very similar chemical compositions. The report describes discovery of a new organic compound in amber called quesnoin, whose precursor exists only in sap produced by a tree currently growing only in Brazils Amazon rainforest.

Researchers say that amber probably seeped out of a similar tree growing in a tropical forest that covered France millions of years ago before Earths continents drifted into their current positions. The region corresponding to modern France could have been found in a geographically critical marshy zone belonging to Africa and a tropical zone 55 million years ago extending through North Africa to the Amazon, the report states. AD

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