Maison -- A study of mammoth dung from a lake bed in Indiana suggests a crashing comet did not wipe out North America's largest ice age animals, scientists said.
The study from the University of Wisconsin, Madison, suggests the decline of mammoths, mastodons and other large ice age animals was a gradual process that took about 1,000 years, graduate student Jacquelyn Gill said in a release Thursday.
Gill and her team studied Sporormiella fungal spores in mammoth dung found in sediment deep within the bed of Appleman Lake in Indiana.
