Some mammoth bones have been gnawing at North Dakota State Geologist Ed Murphy for more than 35 years.

Murphy on Tuesday described for the North Dakota Industrial Commission how he became aware of a find of mammoth bones in 1988. He updated the commission, which oversees the North Dakota Geological Survey, because his department, in cooperation with the State Historical Society, plans to excavate part of the site and may need to request money from the state to finish the job.