Flat-lying Tertiary sandstones crop out in the Southwestern corner of the Oakvale 1 mile sheet, the remaining area being almost entirely Pleistocene. Definition of Quaternary units is difficult due to lack of outcrop, and possible variations in lithology as one moves inland from the Murray River Area. Auger holes are recommended in order to clarify this. The stratigraphic sequence defined from surface outcrop is as follows: Recent salt and gypsum crusts and minor alluvium in clay pans and waterways, together with low red-brown sand dunes and drift sand form a minor proportion of the cover, overlying the very extensive Pleistocene Pooraka Formation, in which the Loveday Soil (?) horizon is developed. Outcrops of Bakara calcrete occur, sometimes calcreting Tertiary ferricretes. Blanchetown clay is found in many of the dams, but is not of sufficient area to depict as outcrop. It can be seen to be underlain by unusual variegated mottled silty clay with tubular structures at one locality. The Tertiary is represented by brown and white micaceous clayey and ferruginous sandstones, having a silcreted upper surface, which is, in turn, often ferricreted.