(CNN) -- Justin Blauwet noticed something unusual while working at a construction site in Iowa. At first glance, it appeared to be a block of stone, just under a foot long, covered in ridges. But ...

A worker in Sheldon, Iowa made a mammoth discovery while working on a construction site earlier this month — literally. DGR Engineering employee Justin Blauwet discovered an 11-pound woolly mammoth ...

SHELDON, Iowa (WKRC/CNN Newsource) - Construction workers in Iowa made a prehistoric, "once-in-a-lifetime" discovery. A woolly mammoth tooth was found on a construction site in the city of Sheldon. It ...

SHELDON, Iowa (KCAU) – A woolly mammoth tooth found in Sheldon, Iowa, is said to be as old as the last time Earth was in a glacial maximum — which scientists say was more than 20,000 years ago. The ...

March 21 (UPI) --Construction work on a property owned by an Iowa college resulted in an unusual discovery -- a tooth from a woolly mammoth believed to have lived more than 20,000 years ago. Justin ...

This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated. SHELDON, Iowa (KCAU) – A woolly mammoth ...