Gilbert Islands separated, and the Gilberts became the Gilbert Islands colony, which issued stamps under that name. In 1979, the Gilberts opted for independence, becoming the independent nation of Kiribati. The Ellice Islands became the independent nation of Tuvalu. Asian Development Bank. (2009b). Kiribati’s political economy and capacity development [Online]. Available: http://www.adb.org/documents/reports/KIR-Political-Economy-Capacity-Development/KIR-Economic-Development.pdf (accessed 6 February 2012). Bedford, R., Macdonald, B., & Munro, D. (1980). Population estimates for Kiribati and Tuvalu, 1850-1900: Review and speculation. Journal of the Polynesian Society, 89, 199-246. Borovnik, M. (2006). Working overseas: Seafarers' remittances and their distribution in Kiribati. Asian Pacific Viewpoint, 47, 151-161. Burnett, G. (2005). Language
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.