A day or so after I wrote the previous post this showed up on the BBC...
Antarctica's Ancient Explosion
An air explosion similar to the Tunguska event in 1908 may have occurred over Antarctica thousands of years ago, according to new research. Tiny meteoritic particles found in Antarctic ice cores suggest that a large space rock exploded in the atmosphere. More at BBC News.
http://news.bbc.co.uk/2/hi/science/nature/8547534.stm
Like I said, "If you find proof that the bottoms of our planets are peppered with space debris it lends some credability to the Sumarian story of Nibiru". A million other things could explain it also but they had the knowledge of and the ability to "Write about it".