John E. Clark has identified "a standard unit of measurement" which also determines "geometrical layouts and spacing intervals among first-mound complexes from Louisiana to Mexico and Peru"
Graeber / Wengrow 144: "[F]inding the same system of measurement across such distances may brove to be 'one of contemporary archaeology's most provocative revelations' [...] it means that someone had to convey knowlege of geometric and mathematical techniques for making accurate spatial measurements, and related forms of labor organization, over very long distances"