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I've only skimmed through the first bit, but this probably answers the question. http://www.geology.wisc.edu/~astrobio/docs/Seiferlin_et_al_2008_Planet_Space_Sc

by geuis 14y ago

I've only skimmed through the first bit, but this probably answers the question. http://www.geology.wisc.edu/~astrobio/docs/Seiferlin_et_al_2008_Planet_Space_Sci.pdf http://www.geology.wisc.edu/~astrobio/docs/Seiferlin_et_al_2...