Ultrathin bifaces are a recently recognized element distinctive to the Folsom toolkit. Ultrathin bifaces are found at many Folsom sites including those in North Dakota, Colorado, New Mexico, Oklahoma, and Texas. Ultrathin bifacial manufacturing technology appears consistent between numerous sites recognized by distinctive, opposed diving bifacial thinning flakes (Root et al. 1994).
Morphologically, the Folsom ultrathin biface is broad in width, has finely retouched excurvate margins, and is extremely thin (Boldurian 1999:111). Functionally, its use is generally interpreted as a non-hafted knife or cutting implement used for butchering and processing game. Pegi Jodry (1998) has suggested that ultrathin bifaces were used and maintained by women for specialized butchering required for drying strips of meat.
Boldurian, Anthony T. 1999 Clovis Revisited:New Perspectives on Paleoindian Adaptations from Blackwater Draw, New Mexico. University of Pennsylvania Museum, Philadelphia.
Jodry, Margaret A. 1998 The Possible Design of Folsom Ultrathin Bifaces as Fillet Knives for Jerky Production. Current Research in the Pleistocene 15:75-77.
Root, Matthew J., J. D. William, Marvin Kay, and L. K. Shifrin 1999 Folsom Ultrathin Biface and Radial Break Tools in the Knife River Flint Quarry Area. In Folsom Lithic Technology: Explorations in Structure and Variation, edited by D. S. Amick, International Monographs in Prehistory, Archaeological Series, Ann Arbor, Michigan.