Partridge, T.C. Tswaing: Investigations into the origin, age and palaeoenvironments of the Pretoria Saltpan - Pretoria Geological Survey of South Africa 1999 - 198 p. ilus., maps., tbls. Subjects--Topical Terms: CRATER METEORITICOGEOCRONOLOGIAGEOLOGIA REGIONALPALEOAMBIENTES Subjects--Geographic Terms: PRETORIA SALTPANSUDAFRICA