During the Carboniferous the craton was rifted apart by the Dnieper-Donets rift. South China rifted away from the Gondwana supercontinent in the Silurian. Volcanic rifted margins are found on the boundary of large igneous provinces. Australia rifted from Antarctica in the Cretaceous. The Cimmerian blocks rifted from Gondwana in the Late Carboniferous. Cimmeria rifted off Gondwana from east to west, from Australia to the eastern Mediterranean. The continent rifted apart between 700 and 600 million years ago. According to these authors, a small rim from Euramerica rifted off when this basin formed. It eventually rifted off, becoming a drifting microcontinent. The South Atlantic did not develop uniformly; rather, it rifted from south to north. Tasmania was rifted off during this stage.