Impact theory under fire once more.

The article offers information on the controversial theory that a comet had exploded in North America wiping people and large animals nearly 13,000 years ago. Archeologists led by Todd Surovell have examined sediments at seven sites and claim that the concentration of magnetic debris was insufficient to confirm an extraterrestrial impact during the period. Surovell states that the search conducted by his team did not find any physical evidence to support the impact theory.