Gilbert and Ellice Islands until 1977. A protectorate was generally established over this area (but not over these islands) by the Pacific Islanders Protection Act of 1857 and then in 1877 for the Western Pacific Territories. The sixteen islands of the Gilberts were declared a British Protectorate by Captain Davis R.N., of between 27 May and 17 June 1892. The Ellice Islands were declared a British Protectorate by Captain Gibson R.N., of , between 9 and 16 October of the same year. The British Western Pacific Territories (BWPT) were administered by a High Commissioner resident in Fiji. A Resident Commissioner, Charles Swayne, was appointed
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.