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Fossil methane seeps are preserved in late Eocene through Pliocene marine sedimentary units of the Cascadia margin of the northeastern Pacific. All Cascadia fossil seeps are situated in the uplifted accretionary wedge that overlies extensive Middle Eocene coal-bearing units and the Paleocene–Early Eocene Siletzia large igneous province. This study describes eight previously unrecorded Oligocene seeps,...
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