Observations of karst events at Old Homestead Cave on the Nullarbor Plain add further evidence for a regional, post-emergence Nullarbor karst history or succession of events. Litho-stratigraphy and facies have exerted a control on dissolution and cavity formation as well as proximity to the surface. Joint control is also recognisable. Phreatic sculpturing is well developed indicating much of the extensive navigable passages formed at or below the water table. The oldest post-cavity infill are red brown clay-rich sediments with a range of textures and fabrics. These are associated with calcite speleothem. Multiple sources (beyond, on and beneath the Plain) are recognised in these and younger sediments. The rainfall gradient explanation for coastal belt distribution of caves on the Plain is questionable.