News FocusMASS EXTINCTION

Has an Impact Done It Again?

See allHide authors and affiliations

Science  21 Nov 2003:
Vol. 302, Issue 5649, pp. 1314-1316
DOI: 10.1126/science.302.5649.1314

You are currently viewing the summary.

View Full Text

Log in to view the full text

Log in through your institution

Log in through your institution

Summary

Researchers claim to have found more proof of a second major impact that triggered a mass extinction. But impact geologists say the newcomers still don't have the right kind of evidence to indict a second killer.