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Fig. 6
Outcrops in the megasplay fault zone. (
a
) An outcrop view at site 889R3 in Fig.
7
.
Southward (seaward) dipping strata are predominant in gently folded, often steeply inclined
sandstone-dominant turbidite deposits (FOV~4 m). (
b
) Northward-dipping fracture cleavage
developed in mudstones at site 889R6 (Reproduced from Anma et al.
2010
; ©Geological Society
of Japan). The cleavage developed obliquely to the basal surface of a sandstone layer dipping
steeply to south (FOV~4 m). (
c
) Sub-vertical strata at site 889R7. Fracture cleavages are densely
developed. (
d
) Subhorizontal deposits of conglomerates interbedded with silty layers (between
site 890R2 and 890R3). Imbrication of pebbles indicates southeastward flow (FOV~4 m). (
e
,
f
)
Occurrence of
Calyptogena nautilei
.
C. nautilei
shells are half buried in mud exposing the hinge-
side into seawater (FOV~1 m). The exposed part of
Calyptogena
shell was dissolved suggesting
that the depth at observation (~3, 400m) is located below the carbonate compensation depth of this
region. Numbers on top-right in (
b
)-(
f
) indicate heading of the submersible (in degree) and depth
(m), respectively
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