http://www.slate.com/articles/video/video/2015/10/farmer_finds_mammoth_while_digging_in_michigan_video.html

James Bristle, who was digging a trench with a backhoe to install a drainage pipe, struck a 3-foot-long bone buried about 8 feet underground on his farm. He contacted the University of Michigan Museum of Paleontology, from which Professor Daniel Fisher and about 15 students showed up and began excavating the site.