Middle Archic Rice Lobed Knife. Material: stone. Size: 1 1/2" W. x 2" L. Description: Siltstone chert; age: 5,000 - 3,000; native to Northern Minnesota.
Middle Archic Knife used by Native Americans. Dr. Schirmer of Minnesota State University, Mankato visited 2 July 2013 and determined that this is a Native American tool.