A sumatralith is a unifacial stone tool closely associated with the Hoabinhian techno-complex of Southeast Asia and manufactured by hunter-gatherer communities during the late Pleistocene to the middle Holocene. They are oval to rectangular in shape with unifacial flaking along the circumference of a rounded cobble or pebble. The end product of a typical sumatralith operational sequence, or chaîne opératoire, is a plano-convex stone tool with little-to-no shaping of the original cobble except for percussive flake removal along its periphery which is only applied to one face to produce its cutting edges. At Spirit Cave, sumatraliths have been found in association with hearth features which provide evidence for the collection of plant products such as peas, beans, almonds, betel, pepper trees, butternuts, candlenuts, cucumbers, and bottle gourds, as well as the acquisition of game like wild cattle, pig, and deer.