A regional gravity low occurring south of Round Hill on the ORROROO 1:250,000 sheet was mapped in detail by closely spaced gravity stations, to investigate its possible connection with diapiric breccia located nearby. The suggested model for the structure causing this anomaly is of a body of low density material with a surface outcrop of 300 m x 500 m, that extends to a depth of 3 km. This interpretation is consistent with structural models proposed for diapirs elsewhere in the Flinders Ranges. No magnetic response was noted which might also be ascribed to the diapir.