Big Rocks

From: "Mark L. Fergerson" <mfergerson1@xxxxxxx>
Date: Mon, 05 Jun 2006 03:26:45 -0700

Everybody else already heard about this?

http://www.physorg.com/news68455520.html

ISTR a thread some time ago about how large an impactor was required to cause plastic deformation of the mantle; does this thing qualify?

Either way, and granted that the article admits to being somewhat tentative since they still want to do local airborne magnetic and gravimetric surveys, any guesses how many of these in the Earth's history? I also vaguely remember an online chart relating impactor size to frequency.

Mark L. Fergerson

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