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 Plate in the north, the Cocos Plate off today's Central America, and the Nazca and Phoenix Plates in the southern Pacific. Charles Darwin had proposed a theory of the slow subsidence of the ocean floor based on his studies of Pacific oceanic islands, seamounts (underwater volcanoes) and guyots (flat-topped seamounts). His observations have been verified and expanded in the development of plate tectonic theory. The tectonic plates continue to move today. The slowest ridge spreading rate is across the Gakkel Ridge in the Arctic Ocean which separates at less than 2.5 cm/yr while the fastest, across the East Pacific Rise