Gilbert and Ellice Islands Gilbert and Ellice Islands The Gilbert and Ellice Islands were a British protectorate from 1892 and colony from 1916 until 1 January 1976, when the islands were divided into two colonies which became independent nations shortly after. A referendum was held in December 1974 to determine whether the Gilbert Islands and Ellice Islands should each have their own administration. As a consequence of the referendum, the Gilbert and Ellice Islands colony ceased to exist on 1 January 1976 and the separate countries of Kiribati and Tuvalu came into existence. The Gilbert Islands (formerly "Kingsmill Islands") are a chain of sixteen
Geology of the Pacific Ocean . The Pacific Ocean developed from the Panthalassa, a vast global ocean, following the breakup of the supercontinent Pangaea in the Mesozoic Era, gradually forming Gondwana and Laurasia, which in turn divided. There is no firm date for when the changeover occurred, as the replacement of the sea bed is a continuous process, though reconstruction maps often change the name from Panthalassic to Pacific around the time the Atlantic Ocean began to open. The Panthalassic Ocean first opened around 750 million years ago at the breakup of Rodinia, but the oldest Pacific Ocean floor is only around 180 Ma old.