Rare prehistoric artifacts are on display in North Dakota's state museum.

The "Clovis" artifacts are unfinished tools that are about 13,000 years old. The people who made them hunted woolly mammoth and mastodon. They're the oldest artifacts in the State Historical Society's collection.

The artifacts were donated by some western North Dakota residents who unearthed them in Golden Valley County. Some of them are now on exhibit in the Recent Acquisitions case at the North Dakota Heritage Center in Bismarck. A permanent display is planned later.

- Associated Press