Argentina, and Perhaps Its Life, Took a Hit

Science  11 Dec 1998:
Vol. 282, Issue 5396, pp. 1965-1966
DOI: 10.1126/science.282.5396.1965a

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The 10-kilometer-wide asteroid that wiped out the dinosaurs and many other species 65 million years ago was just one of a steady stream of debris of all sizes that has splattered the planet, with effects on climate and extinctions varying from negligible to profound. On page 2061, researchers suggest that a lesser impact showered coastal Argentina with blobs of molten glass 3.3 million years ago, perhaps cooling climate and driving some of the region's mammals to extinction. But other researchers say that although the impact looks real, its connection to climate change or extinctions is doubtful.