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Science 25 April 2008:
Vol. 320. no. 5875, pp. 434 - 435
DOI: 10.1126/science.320.5875.434
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News of the Week

GEOCHEMISTRY:
Two Geologic Clocks Finally Keeping the Same Time

Richard A. Kerr

Geochronologists report on page 500 of this week's issue of Science that they have used variations in Earth's orbit to recalibrate one of their isotopic clocks, bringing it into agreement with the other.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)