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Science 13 December 2002:
Vol. 298. no. 5601, p. 2087
DOI: 10.1126/science.298.5601.2087b
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The size, composition, and energy of bolide impacts can be inferred not only from the craters that were left or filled in on Earth's surface, but also from far-flung ejecta deposits. Walkden et al. (p. 2185) have found an ejecta deposit of Triassic age in southwestern Britain that may have come from the Manicouagan crater in northeastern Canada (a distance of about 2000 kilometers), and hence may represent an energetic event that had global repercussions. If further work confirms the 214-million-year age of the ejecta deposit, then this event will have occurred just prior to the species extinctions recognized at the Triassic-Jurassic boundary about 202 million years ago.




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