Madison Points are named after Madison County, Illinois. They are made from a variety of local raw materials. These points are common in the upper Mississippi River valley, and are associated with the Mississippi Culture of the Woodland Period.
Madison points are small, thin, unnotched triangular points. The blade edges tend to be straight sided, but are occasionally slightly concave or convex; the bases also range from concave to convex. These points are usually about half as wide as they are long; they range anywhere in length from 1 to 2 1/2 inches (2.5 to 6 cm).
Marrow, Toby. Iowa Projectile Points, Madison Point. P.80. 1984.