Clovis population decline at Younger Dryas?

One of the original 2007 Acapulco AGU posters:

Recent evaluation by the author of the South Carolina Paleoindian point database indicates the substantial presence of a suspected Middle Paleoindian point historically known as Redstone (Cambron and Hulse, 1964; Mason, 1962; Perino, 1968; Williams and Stoltman, 1965). When compared with the known abundance of Clovis points in South Carolina, a post-Clovis population decline is inferred. Because of recent discoveries in South Carolina of large fluted points typical of the Redstone, it became clear that the Redstone had a straight to trianguloid blade configuration from the earliest stage of its use life. Lanceolates with extremely long prominent flutes heretofore had been classified as Clovis (Charles and Michie, 1992; Goodyear et al., 1990; Michie, 1977). Accordingly, a review of all fluted points yielded a total of 48 Redstones that had previously been misclassified as Clovis.

2026 update: Clovis, Redstone, and population change

Added November 10, 2026: This poster returns to the question raised above, comparing Clovis and Redstone point distributions and considering changes in human settlement around the Younger Dryas. Chris Moore supplied it with the 2026 Paleoamerican Odyssey posters.