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Adams Seamount
"Adams Seamount was constructed above the Pitcairn hot spot in the central Pacific, about 90 km WSW of Pitcairn Island. The massive seamount rises about 3500 m to within 59 m of the sea surface about 25 km SW of another large submarine volcano within the Pitcairn hot spot, Bounty Seamount. The Pitcairn hot spot was built over 30-million-year-old Pacific Ocean crust, and in addition to the two large volcanoes, Adams and Bounty seamounts, contains about 20 small volcanic hills about 500 m high. Although Bounty Seamount, which rises to within 450 m of the sea surface, appears morphologically more youthful than Adams and water samples indicate continuing hydrothermal activity, two late-Pleistocene Potassium-Argon dates of about 338,000 and 350,000 years were obtained from the flanks of Bounty. Alkali basaltic rocks were dredged from the flanks of Adams Seamount, whose summit appears to consist of a trachytic lava dome. Several Potassium-Argon dates of Holocene age were obtained from dredges at Adams Seamount (Guillou et al., 1997), the youngest of which was 2000 +/- 1000 years."  -Smithsonian Volcano Archive
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