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Paleo Slide Set: Polar Ice Cores
Deep drilling at Vostok
Deep drilling at Vostok was begun by the Soviets in 1980. After five years of coring, a stuck drill brought the 3G core, whose shelter is shown here, to a halt. Chemical analysis of air bubbles trapped in the 160,000 year record contained in this 2202 m core gave scientists their first long look at the past composition of Earth's atmosphere.

Photo Credits:
Todd Sowers
LDEO, Columbia University, Palisades, New York.
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Last Modified: 12 October 2001

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