PhysOrg.com [USA], April 18, 2011
The breakdown of the seasonality pattern marked a period of dramatic
climate change 16 �12 million years ago. This is the finding of an
analysis of fossil oyster shells from the area around Vienna. The growth
in calcium carbonate, which these shells experience every year, means
that they "store" information on climatic conditions in high temporal
resolution. A project conducted by the Austrian Science Fund FWF has
recently analysed this growth. The identified change in the annual
seasonality pattern during that period is surprising, as scientists had
only been aware of a major temperature decline to date.
http://www.physorg.com/news/2011-04-oyster-shells-scientific-treasure-trove.html
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