The volcanic Etendeka Formation of S.W.A./Namibia consists predominantly of interbedded basalt and quartz latite units with an approximate age of 121 m.y. The quartz latites, which represent a significant proportion of the succession, exhibit characteristics common to both ignimbrites and lava flows. The local preservation of pyroclastic textures and broad areal extent of the units have led to the conclusion that these quartz latites are the products of high-temperature ash flows, which underwent en masse lava-like flowage following their deposition but prior to final cooling.