The low rainfall and somewhat mountainous area of the Serle 1 - Mile Geological Sheet is one of predominantly Pre-Cambrian and Early Palaeozoic outcrop with only shallow depths of Quaternary alluvium and a few patches of Tertiary conglomerate. A number of small supplies of underground water is required for watering sheep and for some supplementary domestic purposes. This demand has been met by shallow wells and bores of varying salinities supplying water from jointed older rocks and arenaceous alluvium. Additional supplies should be available if sites are chosen with care so as to tap well jointed older rock or suitable depths of Quaternary alluvium at points of ready recharge. Faults or severely crushed and mineralized areas are doubtful prospects but adjacent zones of well developed cleavage near lines of drainage may provide likely well or bore sites.