Examination of the lithologies of Aboriginal artefacts from western South Australia has been undertaken and the lithologies categorised. Stone tools were manufactured from a range of indurated silicified materials, derived from abundant local sources. In the SA Museum and other collections that were examined in this brief study, artefacts derived from Wilson Bluff on the Nullarbor Plain were not observed in the material from sites to the north, and are rare or minor to the east, implying no economic significance in the trade or movement of this resource. This finding is at variance with the reported trading with desert peoples, by Daisy Bates and Norman Tindale, but supports the technological analyses carried out by Barry Cundy at the Wilson Bluff sites of tool manufacture. The significance of the occurrence of silicified Wilson Bluff Limestone artefacts east of the Nullarbor Plain, toward the Gawler Ranges, is not clear and may only be resolved by field examination. The material at these five sites may have either been locally derived, in which case additional geological information is being provided, or if derived from the Nullarbor Plain, could indicate a ritual or mythological significance.