The type site is the Gronefeld Site, St. Charles County, Missouri. Found throughout the Eastern United States and the Midwest primarily south of Wisconsin, but a few examples have been found in western Wisconsin and southern Minnesota, including at the Challey-Turbenson workshop site. Scarce in the Upper Ohio Valley. Blades are well made with convex sides and widest at the mid-section or towards the shoulder. Notches are deep and narrow or moderately V-shaped.
Stems are generally short and narrow from the shoulders.
Bases are usually ground and strongly convex. Wisconsin examples are usually made of Hixton Silicified Sandstone. MVAC Educational Programs are supported in part by the National Endowment for the Humanities . This project was supported, in part, by the National Science Foundation . Opinions expressed are those of the authors and not necessarily those of the Foundation.