Spiroan trade network in Mississippian times (about A.D. 1250-1450) according to Frank Schambach. This interpretation shows bison products moving from the Plains east to the Mississippi valley, while prestige goods moved the opposite direction. Bows made of Bois d'arc (Osage orange) from the Red River valley near the Sanders site went both east and west. Courtesy Frank Schambach.
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