Gilbert and Ellice Islands the latitude of 5° to 10° south and longitude of 176° to 180°, west of the International Date Line. The Ellice Islands are midway between Hawaii and Australia. The Ellice Islands are recognised as part of the Polynesia subregion of Oceania. In 1606 Pedro Fernandes de Queirós sighted Butaritari and Makin, which he named the Buen Viaje (‘good trip’ in Spanish) Islands. The Gilbert Islands were named in 1820 by a Russian Admiral, Baron Johann von Krusenstern, after a British captain, Thomas Gilbert, who encountered the archipelago in 1788 while exploring an Outer Passage route from Port Jackson to Canton.
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