There are no known Proterozoic claystones on Earth?? On 11/06/2013 12:13, "Ron Baalke" <[email protected]> wrote:
> >http://www.ifa.hawaii.edu/info/press-releases/MartianClay/ > ><snip> > >The significance goes beyond an interest in the red planet, as Hallis >explains: "Earth and Mars used to have much more in common than they do >today. Over time, Mars has lost a lot of its atmosphere and surface >water, but ancient meteorites preserve delicate clays from wetter >periods in Mars' history. The Martian clay we studied is thought to be >up to 700 million years old. The recycling of the Earth's crust via >plate tectonics has left no evidence of clays this old on our planet; >hence Martian clays could provide essential information regarding >environmental conditions on the early Earth." ><snip> ______________________________________________ Visit the Archives at http://www.meteorite-list-archives.com Meteorite-list mailing list [email protected] http://six.pairlist.net/mailman/listinfo/meteorite-list
