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Fig. 3 Dive locations and major structural features of Tenryu canyon. Dives 1056, 1057, and
1058 are the focus of this effort and their locations are outlined in red (Basemap and structural
interpretations from Soh and Tokuyama ( 2002 ) and Kawamura et al. ( 2009 ))
layers average approximately 20 cm thick, while mud layers average roughly 10 cm
thick (Fig. 4 ). These strata were likely deposited as turbidite flows associated with
the transport of sediment into the trench from Tenryu canyon and other areas to the
east-northeast, as is the case for other areas of the Nankai trough (Pickering et al.
1992 ; Underwood and Pickering 1996 ). Therefore we can assume an original hori-
zontality for the bedding, or at least a depositional dip of <~5°.
We estimate that the samples collected during dives 1056 and 1057 have roughly
the same biostratigraphic ages as those collected during the Kawamura et al. ( 2009 )
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