Construction workers working on the new public safety building in Thornton found a rare triceratops skeleton and skull Friday.

The find is one of three triceratops skulls found along the Front Range and has likely been laying there for at least 66 million years, Denver Museum of Nature and Science curator of dinosaurs Joe Sertich said in a statement.

“My heart was racing,” he said. “As soon as (we) uncovered it and realized this was a horn of a triceratops and not just another leg bone or part of a hip, it made the site really exciting.”

The crew has unearthed a horn and shoulder blade so far, according to the museum.

Read the full story on The Denver Post website.