(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 — A prehistoric discovery was made at an Iowa construction site when a member of an engineering crew found a tooth that once belonged to a woolly mammoth. The person who found the tooth, ...

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 ...