Alterations in interpretation of the stratigraphic succession of sediments in the vicinity of Muloowurtina Station, South Australia are suggested following geologic and palaeontologic investigations in this area. "Early Tertiary (Eyrian)" sediments of Mount Babbage and adjacent areas are ascribed on floral evidence to the lower Cretaceous (late Neocomian-early Aptian) Blythesdale Sandstones. Cretaceous boulder bearing sediments, formerly regarded as Winton Beds (Canomanian) are Aptian in age (Roma Formation), the boulders representing resorted scree accumulations from the adjacent Flinders Range and not as previously described Cretaceous glacial erratics.