AbstractSmall blades, blade tools, and cores recently found at the Cahokia site, Illinois, represent a microblade industry probably affiliated with the Old Village stage of Middle Mississippian. The artifacts are described, and attempts to assess their probable functions are discussed. The available comparative evidence is insufficient to demonstrate the degree of historical relationship, if any, between this newly defined industry and such other blade industries in the eastern United States as Poverty Point and Hopewell.