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Science 26 May 2006:
Vol. 312. no. 5777, pp. 1132 - 1133
DOI: 10.1126/science.312.5777.1132
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News Focus

PLANETARY SCIENCE:
Who Can Read the Martian Clock?

Richard A. Kerr

HOUSTON, TEXAS--Researchers squabble over how to date martian geology by tallying impact craters. They're down for the count. (Read more.)

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