Geology of the Pacific Ocean Geology of the Pacific Ocean The Pacific Ocean evolved in the Mesozoic from the Panthalassic Ocean, which had formed when Rodinia rifted apart around 750 Ma. The first ocean floor which is part of the current Pacific Plate began 160 Ma to the west of the central Pacific and subsequently developed into the largest oceanic plate on Earth. The tectonic plates continue to move today. The slowest spreading ridge is the Gakkel Ridge on the Arctic Ocean floor, which spreads at less than , while the fastest, the East Pacific Rise near Easter Island, has a spreading rate of over
Cape Nansen Cape Nansen Cape Nansen () is a headland in the Greenland Sea, east Greenland, Sermersooq municipality. This cape is named after Fridtjof Nansen. Cape Nansen is an important geographical landmark. Cape Nansen is located to the northeast of the mouth of the Nansen Fjord in an indented area of the eastern Greenland coast where there is a succession of headlands with active glaciers in between. The cape lies 15 km to the east-northeast of the mighty Cape J.A.D. Jensen on Sokongen Island This headland has been defined by the International Hydrographic Organization as the Southwest limit of the Greenland Sea,