Carbon-14 and thermoluminescent (TL) dates have been determined for two fireplaces excavated from a prehistoric site at Roonka in South Australia. Calcrete (kunkar) ovenstones are shown to be suitable material for thermoluminescent dating. For the more recent of the fireplaces, a group of ¹⁴C dates ranging 360-1100 years before present (BP), compared with two TL dates of 960 and 1070 years BP. An older fireplace was dated by TL in the range 2010-2450 years BP but by ¹⁴C as 11,290 years BP. The time ordering of the fireplaces and the spread of ages for the younger fireplace are consistent with the archaeological evidence from the excavation. However, no satisfactory explanation is yet forthcoming for the discrepancy between the ¹⁴C and TL dates for the older fireplace.