Paleontology student Hillary McLean pieced together the tusk of an ancient mastodon, part of an extensive discovery unearthed from Snowmass, Colo., inside a workroom at the Denver Museum of Nature and Science.
Paleontology student Hillary McLean pieced together the tusk of an ancient mastodon, part of an extensive discovery unearthed from Snowmass, Colo., inside a workroom at the Denver Museum of Nature and Science. Brennan Linsley AP
Paleontology student Hillary McLean pieced together the tusk of an ancient mastodon, part of an extensive discovery unearthed from Snowmass, Colo., inside a workroom at the Denver Museum of Nature and Science. Brennan Linsley AP

Colorado mastodon bones show ancient warmer Earth

November 26, 2014 1:21 PM