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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