The Oregon State football team was thiiiis close to playing on top of a MAMMOTH GRAVEYARD ... because officials say bones have been found at the site where workers are expanding the stadium!
School officials say construction workers have dug up a intact femur from a mammoth -- as well as bones from other animals -- while excavating the site of the Reser Stadium expansion project.
Officials say they'll be releasing more info on the discovery very soon. Stay tuned ...