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was formed 1.27+-0.02 million years ago. The caldera's dimensions are estimated at 5.9 miles (9.5 km) in length and 3 miles (4.8 km) in width. The southeast part of the caldera makes up
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between 1.54 and 1.28 million years ago. It has been estimated that the volcano was as high as 3,937 feet (1,200 m) above sea level. Activity on Pago
Volcano ended with emplacement of
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Harris, Ann G. (2004), Tuttle, Esther; Tuttle, Sherwood D. (eds.),
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Geology and
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93:"Age and Evolution of the Volcanoes of Tutuila, American Samoa"
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has been eroded out of the southeastern portion of the caldera.
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318:Extinct volcanoes of the United States
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323:Polygenetic shield volcanoes
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