Change of tectono-stratigraphic regime in the Australian plate during the 99 Ma (mid-Cretaceous) and 43 Ma (mid-Eocene) swerves of the Pacific

The clockwise bend at 99 Ma (mid-Cretaceous) in linear volcanic chains in t he tropical Pacific coincides with a change from pre-99 Ma head-on Chilean- type subduction of the Pacific plate beneath eastern Gondwana to 99-43 Ma s inistral oblique Mariana-type subduction and strike-slip breakup by simple sea-floor spreading between Australia and Antarctica and by backarc spreadi ng in the southwest Pacific. The 99 Ma breakup of Australia from Antarctica is documented by a mid-Cretaceous unconformity, This tectono-stratigraphic change founded modern Australia, with a mountain chain along an upper plat e margin in the east and lowlands on the lower plate margin in the south. T he counterclockwise bend at 43 Ma (mid-Eocene)-the Emperor-Hawaiian bend-co incides with the onset of structure in the Challenger Rift of New Zealand, the Eromanga-Cooper basin of central Australia, and the oil-shale grabens o f coastal Queensland.