Quartz latite units interbedded with basaltic lavas in the Etendeka Formation form extensive sheet-like deposits which are probably the product of high temperature ash-flows. Apart from some systematic differences between pitchstone and devitrified quartz latites, largely explained by low temperature alteration processes, individual quartz latite units exhibit remarkably uniform compositions. No significant lateral compositional variations within individual units are observed and compositional changes occur only in the uppermost parts of any particular unit. A regional stratigraphic correlation is difficult to establish due to local differences that may be attributed to palaeotopography and the faulted nature of the coastal region in the Etendeka. In this study geochemistry has been used as a primary criterion for the correlation of major quartz latite units within the southern Etendeka area.