The bulk of the late Archaean volcanic/volcaniclastic rocks from the Gawler Craton range in age from c. 2535 to 2510 Ma (Fanning, Reid and Teale 2007). However, these units were preceded by an older set of volcanics, the c. 2558 calcalkaline volcanics of the northeastern Gawler Craton (Cowley and Fanning 1991). These older bimodal volcanics have not been discovered in outcrop and are confirmed only in one mineral exploration drillhole, DP1, located in the northern Olympic Cu-Au province, midway between Olympic Dam and Prominent Hill. Upon discovery, these low-grade metavolcanics were initially correlated with the c. 1592 Ma Gawler Range Volcanics (Giles 1981). However, U-Pb zircon dating defined an eruption age of 2558 ± 6 Ma (Cowley and Fanning 1991), indicating that the volcanics were a significantly older and unrelated magmatic event. These older volcanics, informally known as the Devil's Playground Volcanics, are formally defined herein (see Appendix). The calcalkaline geochemistry and low-metamorphic grade make these volcanics an exploration target in themselves, with potential for volcanic-related sulfide and or gold mineralisation. Recent PACE-supported drilling by Eromanga Uranium Limited in the vicinity of DP1 intersected weakly metamorphosed basaltic to andesitic volcanics at depths <300 m. This article presents petrological and geochemical results from these recently discovered volcanics, along with a discussion of possible correlations. The data has implications for our knowledge of the distribution, geochemistry and mineral potential of the c. 2558 Ma volcanism within the Gawler Craton.