Postage stamps and postal history of the Gilbert and Ellice Islands Tuvalu. The Gilbert Islands issued stamps under that name before attaining independence on 12 July 1979 as the Republic of Kiribati. The first stamps of Kiribati were a pair issued on 19 November 1979 to mark the independence of the country. The Tuvalu Philatelic Bureau was established on 1 January 1976, which was the day the Gilbert and Ellice Islands colony was dissolved and Tuvalu established as a separate British dependency. The first stamp issue was a set of provisional overprinted definitive stamps and a commemorative set of three stamps. The first postage stamp cancellation devices were put into use
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