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Peter Smith
Jul 22, 1990

The Scientist has asked a group of experts to comment periodically upon recent articles that they have found noteworthy. Their selections, presented here in every issue, are neither endorsements of content nor the result of systematic searching. Rather, the list represents personal choices of articles the columnists believe the scientific community as a whole may also find interesting. Reprints of any articles cited here may be ordered through The Genuine Article, 3501 Market St., Philadelphia, Pa. 19104, or by telephoning (215) 386-4399.


Department of Earth Sciences
Open University
Milton Keynes, U.K.

  • A combined paleomagnetic, sedimentological, and stratigraphic study of a Late Devonian iridium anomaly in Western Australia suggests that the iridium was concentrated over a long period by purely biological processes. In short, meteorite impact is not the only way of generating iridium anomalies in the earth's crust.

    N.F. Hurley, R. Van der Voo, "Magnetostratigraphy, Late Devonian iridium anomaly, and...

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