This Folsom ultratin knife is a rare offering. It is made of Knife River 'flint' (silicified lignite) from North Dakota; a favorite material of Folsom knappers. These are particularly difficult to make because of their thinness. This piece is 81.5mm long, 56mm wide and only 5mm thick. It has a W/Th ratio of 11.2/1. Made by Bruce Bradley 17 February 2021.
For more information about Folsom ultrathins see: https://www.arrowheads.com/index.php/flint-projectiles-and-knives/406-folsom-ultrathin-knives