This image of the seafloor on Patton Seamount in the Gulf of Alaska shows the type of rocks we expect to find. Most of the rocks are fist- to head-sized chunks of basalt (a black volcanic rock).
Related Links
Exploring Alaska's Seamounts:
Volcanic History of Seamounts in the Gulf of Alaska
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http://oceanexplorer.noaa.gov/explorations/02alaska/background/geology/media/pattonrocks.html
