Gilbert and Ellice Islands Gilberts or secede. They were told that if they separated they would not receive royalties from the Ocean Island phosphate or other assets of the colony. Despite this, 3799 Tuvaluans (92%) voted to secede, while 293 voted against secession. On 1 October 1975, legal separation from the Gilbert Islands (now Kiribati), took place. On 1 January 1976, full administration of the new colony was transferred to Funafuti from Tarawa. Tuvalu became an independent constitutional monarchy and the 38th member of the Commonwealth on the 1 October 1978. The Gilbert Islands attained independence on 12 July 1979 under the name Kiribati
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.