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
Fridtjof Nansen them. The edge of the pack ice was reached on 6 August and they shot the last of their dogs—the weakest of which they killed regularly to feed the other since 24 April. The two kayaks were lashed together, a sail was raised, and they made for the land. It soon became clear this land was part of an archipelago. As they moved southwards, Nansen tentatively identified a headland as Cape Felder on the western edge of Franz Josef Land. Towards the end of August, as the weather grew colder and travel became increasingly difficult, Nansen decided to camp for