A short duration of the Cretaceous-Tertiary boundary event: evidence from extraterrestrial helium-3.

@article{Mukhopadhyay2001ASD,
  title={A short duration of the Cretaceous-Tertiary boundary event: evidence from extraterrestrial helium-3.},
  author={Sumit Mukhopadhyay and Kathleen A. Farley and Alessandro Montanari},
  journal={Science},
  year={2001},
  volume={291 5510},
  pages={
          1952-5
        }
}
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… CONTINUE READING
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