A class of pressure-flaked stone objects of crescentic shape made to an easily recognizable pattern is usually associated with surface sites adjacent to continuous or discontinuous bodies of water or playas. The crescent has a distribution from the Southern California Channel Islands to western Utah and the Columbia Basin in Washington. Even though its function is not yet known, it nevertheless is — because of a unique and consistent association of attributes — a useful material culture trait that may serve as a marker for a particular cultural complex. The trait is not known to be associated with the small-game hunting and food-gathering based cultures of the Archaic stage. Archaeological evidence indicates that the crescent is contemporaneous with big-game hunting cultures of the techno-economic level associated with the upper Lithic stage.