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3 January 2011

Four books on time

Callan reviews four books about geologic time.


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6 April 2010

Suess effect II: corals sing an isotopic song

Almost a year ago, on my old blog, I brought up the issue of the Suess effect. Go read that post if you don’t remember what the Suess effect is. If you want an executive summary, digest this: The burning of low-14C fossil fuels (because the fuels are old and the 14C has all decayed), lowers the total atmospheric ratio of 14C relative to other isotopes of carbon. The carbon …


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8 March 2010

When the Sturtian happened

Last Friday, I spent the evening riding up to New York on a bus. To pass the time, I had my iPod and a new paper by Francis Macdonald and colleagues in Science. The paper examines the timing of one of the episodes of “Snowball Earth” glaciation. There’s some important new data in this paper, and it helps constrain the “Sturtian” glaciation in time. So here’s the deal with Precambrian …


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