Ancient Shells Harden Link Between Climate Change and Greenhouse Gases
Submitted by Richard on September 24, 2007 - 10:18am
Domatoceras, a precursor of the squid with a hard shell, thrived 443 million years ago during the early Silurian period. More than 100 million years later during the Carboniferous period, Pentamerus, a clamlike, two-shelled invertebrate, clustered on ocean floors. Both stored rare isotopes of carbon and oxygen in their calcium carbonate shells that then fossilized. By examining the percentage of such bonded rare isotopes, scientists have now confirmed the link between carbon dioxide levels and warmer ancient climates.
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Domatoceras, a precursor of the squid with a hard shell, thrived 443 million years ago during the early Silurian period. More than 100 million years later during the Carboniferous period, Pentamerus, a clamlike, two-shelled invertebrate, clustered on ocean floors. Both stored rare isotopes of carbon and oxygen in their calcium carbonate shells that then fossilized. By examining the percentage of such bonded rare isotopes, scientists have now confirmed the link between carbon dioxide levels and warmer ancient climates.
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