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From another source...

The buckyballs at the Permian-Triassic boundary contain trapped helium and argon with isotopic compositions like those in meteorites called carbonaceous chondrites, and very different from those on Earth. This led Becker and her colleagues to conclude that impact of a 9-kilometer asteroid deposited the buckyballs. An unanswered question is whether this impact caused the mass extinction by itself or did so in collaboration with the Siberian volcanism and possibly unrelated climate changes.

When did Pangia break, to begin migrating round the globe? Couls two or three two or three kilometer objects striking at various points have caused the plates to separate and begin the plate tectonics we Science measures?

45 posted on 09/02/2006 5:37:04 PM PDT by MHGinTN (If you can read this, you've had life support from someone. Promote life support for others.)