[meteorite-list] Re:Comet hit Britain in mid sixth, century, AD?

[tracy latimer]

If you're talking about catastrophic events during the Dark Ages, wasn't 
there an episode where major outgassing from volcanoes (fluorine and other 
nasty volcanic gases) in Iceland poisoned most of the viable cropland there, 
and the effects were felt up to several hundred miles away?  I vaguely 
recall a timeframe of around 500-600 (maybe 700?) a.d.  First the grass all 
died, crops were poisoned, the cattle couldn't get enough to eat and 
eventually died, either from starvation or poisoning, then it was the 
people's turn...

Tracy Latimer