Abstract
Deposition of the unconformity-bounded sequence comprising the Great Artesian Basin in eastern Australia occurred in the Upper Zenithic phase as classified by the biblical geological model proposed previously by Walker. Relevant characteristics for classification include the continental scale of the structure and the presence of fossils, particularly fossil footprints. Classification was assisted by the fact that the structure has experienced minimal disturbance and significant erosion since deposition. The presence of flat-topped landforms in the thickest part of the sequence is also a significant factor assisting classification.