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Science 21 November 1997:
Vol. 278. no. 5342, pp. 1401 - 1402
DOI: 10.1126/science.278.5342.1401
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Research News

PALEONTOLOGY:
Will Fossil From Down Under Upend Mammal Evolution?

Bernice Wuethrich

The discovery of the oldest mammal fossil yet found in Australia, reported in this issue of Science (p. 1438), could cause researchers to rethink some long-held views about the early history of mammalian evolution. If the suspicions of its discoverers are correct, the 115-million-year-old, shrew-sized creature may be a placental mammal--one that nourishes its developing embryo within the mother's uterus. That would put placental mammals down under 110 million years earlier than believed.

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