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Science 17 December 1999:
Vol. 286. no. 5448, pp. 2254 - 2256
DOI: 10.1126/science.286.5448.2254
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News Focus

GEOPHYSICS:
Ancient Continent Opens Window on the Early Earth

Carl Zimmer

ACASTA RIVER, NORTHWEST TERRITORIES--For the past 5 years, a team of geologists has been mapping and precisely dating the ancient rocks in this remote part of Canada. They now report that they have placed the Acasta rocks--some of which are the oldest on Earth--within a relatively large protocontinent, and that they can trace its history for 1.5 billion years after its beginnings 4 billion years ago. In the process they are shedding light on some of the most important questions about the early Earth.

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