A sandstone and 3 conglomerate samples consist mainly of quartzite and monocrystalline quartz clasts, but also contain substantial feldspar, principally microcline. Much of the microcline is fresh and some contains inclusions of quartz. Opaque heavy minerals and zircon are minor constituents. Chemically active solutions passing through the clay matrix have corroded framework grains, caused the alteration of feldspar and generated sericite and mica flakes in an expanded matrix. Varied precipitation of iron compounds has stained clasts and matrix lightly to heavily. In the source terrain, metamorphic quartzites and fresh granitoids were exposed, but there is no evidence of any Gawler Range Volcanics. Some clasts have been recycled from earlier sediments.