Tutuila Island, Samoa.

Extensively eroded, Tutuila Island, in the center of the Samoan Islands

consists of five Pliocene-to-Pleistocene volcanoes

constructed along rifts trending SSW-NNE.

The Pago shield volcano in the center of the island

is truncated by an eroded, 9-km-wide caldera that encloses Pago Pago harbor on its west side.

The caldera is now partially filled by cinder cones and trachytic lava domes.

Rainmaker Mountain, illustrated on the stamp below, is a ridge opposite Pago Pago,

on the east side of the harbour.

The stamp was issued August 18th, 1988.

(thanks to Matt Stoll and David Moser for identification)


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