Weathering history of the Australian continent

Paleogeographic reconstructions indicate that parts of the Australian continent have been exposed above sea level for hundreds of millions of years. Paleomagnetic dating of giant weathering profiles (up to 100 m deep) in open pit mines reveals three major periods of deep oxidation: Late Cenozoic (20 Ma to present), Latest Cretaceous to Paleogene (75-55 Ma) and Late Carboniferous to Early Permian (320-290 Ma).