When early man crossed the landscape he sought out quality stone to make tools. Stone was needed to form chopping edges, bits for boring holes in wood and bone, scrapers for cleaning hides, and sharp and pointed edges for cutting and piercing. Located near Dunn Center, North Dakota, is a prehistoric quarry of dark brown rock. Knife River Flint has been used for thousands of years. Clovis points have been unearthed dating back 10,000 years. Artifacts of Knife River Flint have been found from Montana to New York, Canada to New Mexico. Pictured is a projectile point and several spalls of Knife River Flint.