A Short Duration of the Cretaceous-Tertiary Boundary Event: Evidence from Extraterrestrial Helium-3

Details A Short Duration of the Cretaceous-Tertiary Boundary Event: Evidence from Extraterrestrial Helium-3 A Short Duration of the Cretaceous-Tertiary Boundary Event: Evidence from Extraterrestrial Helium-3

Mar 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001sci...291.1952m&link_type=abstract

Science, Volume 291, Issue 5510, pp. 1952-1955 (2001).

Computer Science

17

Scientific paper

Analyses of marine carbonates through the interval 63.9 to 65.4 million years ago indicate a near-constant flux of extraterrestrial helium-3, a tracer of the accretion rate of interplanetary dust to Earth. This observation indicates that the bolide associated with the Cretaceous-Tertiary (K-T) extinction event was not accompanied by enhanced solar system dustiness and so could not have been a member of a comet shower. The use of helium-3 as a constant-flux proxy of sedimentation rate implies deposition of the K-T boundary clay in (10 +/- 2) × 103 years, precluding the possibility of a long hiatus at the boundary and requiring extremely rapid faunal turnover.

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