A similar set of tools to the chitho were used by Plains Indians for hideworking, consisting of slightly abrasive osseous bone and worn-edge cobbles spalls. Through microscopic analysis, mountain archaeologists have linked this activity to the use of one-hand manos or irregular alluvial cobbles (corr. with Alan Reed). Chithos and osseus bone spalls were not included in earlier searches, which may explain why they have not been recognized. These comparative tool and holder images from a study by John Ives reveals similarity of shaping – and by inference – purpose.
