Before revision: Theories of natural delimitation between the Atlantic and Pacific oceans 300px|Map showing the proposal presented by the thesis entitled "Natural delimitation between the Pacific and South Atlantic Oceans by the Shackleton Fracture Zone".
After revision: Theories of natural delimitation between the Atlantic and Pacific oceans 300px|Map showing the proposal presented by the thesis entitled "Natural delimitation between the Pacific and South Atlantic oceans by the Shackleton Fracture Zone".