Becker et al. 2001
Becker, L., R.J. Poreda, A.G. Hunt, T.E. Bunch, and M. Rampino, 2001: Impact event at the Permian-Triassic boundary: Evidence from extraterrestrial noble gases in fullerenes. Science, 291, 1530-1533, doi:10.1126/science.1057243.
The Permian-Triassic boundary (PTB) event, which occurred about 251.4 million years ago, is marked by the most severe mass extinction in the geologic record. Recent studies of some PTB sites indicate that the extinction occurred very abruptly, consistent with a catastrophic, possibly extraterrestrial, cause. Fullerenes (C60 to C200) from sediments at the PTB contain trapped helium and argon with isotope ratios similar to the planretary component of carbonaceous chondrites. These data imply that an impact event (asteroidal or cometary) accompanied the extinction, as was the case for the Cretaceous-Tertiary extinction event about 65 million years ago.
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Becker, L., Poreda, R.J., Hunt, A.G., Bunch, T.E., and Rampino, M.: Impact event at the Permian-Triassic boundary: Evidence from extraterrestrial noble gases in fullerenes, Science, 291, 1530-1533, doi:10.1126/science.1057243, 2001.
Becker, L., R.J. Poreda, A.G. Hunt, T.E. Bunch, and M. Rampino (2001), Impact event at the Permian-Triassic boundary: Evidence from extraterrestrial noble gases in fullerenes, Science, 291, 1530-1533, doi:10.1126/science.1057243.
Becker, L., R.J. Poreda, A.G. Hunt, T.E. Bunch, and M. Rampino, 2001: Impact event at the Permian-Triassic boundary: Evidence from extraterrestrial noble gases in fullerenes. Science, 291, 1530-1533, doi:10.1126/science.1057243.
Becker, L., Poreda, R.J., Hunt, A.G., Bunch, T.E., & Rampino, M. 2001, Science, 291, 1530, doi:10.1126/science.1057243.
Becker L, Poreda RJ, Hunt AG, Bunch TE, Rampino M. Impact event at the Permian-Triassic boundary: Evidence from extraterrestrial noble gases in fullerenes, Science 2001;291:1530-1533. doi:10.1126/science.1057243.
L. Becker, R.J. Poreda, A.G. Hunt, T.E. Bunch, M. Rampino, Science 291, 1530-1533, doi:10.1126/science.1057243 (2001).
