Gilbert and Ellice Islands 12 January 1916 by the Gilbert and Ellice Islands Order in Council, 1915. Fanning Island and Washington Island also became included in the colony together with the islands of the Union Islands (now known as Tokelau); Christmas Island was included in 1919 but was contested by the U.S. under its Guano Islands Act of 1856. The Union Islands were transferred to New Zealand in 1926. The Gilbert and Ellice Islands colony continued to be administered by a Resident Commissioner. In 1930 the Resident Commissioner, Arthur Grimble, issued revised laws, "Regulations for the good Order and Cleanliness of the Gilbert and
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