By John Timmer |
It’s relatively easy to track the history of animal life, as animals are often macroscopic and build things like shells and bone. But about 70 percent of the history of life on earth appears to have taken place before animals were on the scene, meaning fossils can only tell a partial story. At the recent evolution symposium hosted by Rockefeller University, Roger Buick spoke about trying to reconstruct the history of the time when Bacteria and Archaea ruled the earth. Separately, Andrew Knoll discussed his attempts to use geology to try to understand the conditions that allowed animal life to bring an end to that era.
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