January 9, 2004
The Cold, Cold War
Geologists heatedly debate whether the earth ever froze over completelyGraphic: 3 Recipes for a Frozen WorldBy RICHARD MONASTERSKY
On his office windowsill, A. Jay Kaufman displays pieces of a world gone crazy.
The hunks of black, gray, and pink rock, collected in Namibia and in Death Valley, Calif., hail from a time more than half a billion years ago, when the planet lurched through climatic convulsions that dwarf anything that has happened since. "It was an awfully cold
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