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Fig. 12.11 Stratigraphic section for San Luis Pass, Texas based on 10 vibracores. The section shows 8.5 m of inlet fi ll containing
shelly sand and muddy sand (After Israel et al. ( 1987 )
wave-dominated coasts typifi ed by tidal inlets that
open during major storms and close during post storm
recovery periods, or ones in which the inlet channel
migrates several kilometers along the coast. For exam-
ple, Shackleford Banks, located just west of Cape
Lookout, is 14 km long and has tidal inlet sediments
that extend to depths of 9-20 m and underlie at least
11 km of the barrier (Susman and Herron 1979 ) .
A core through the western end of the island shows
a typical tidal-inlet sequence consisting of a coarse,
pebbly sand and shell lag sitting atop an erosional con-
tact with the underlying Pleistocene units. The coarse
sediment lag is overlain by a 11-m thick, planar to
cross-bedded, poorly sorted, fi ning upward (medium
to fi ne sand) sequence that is topped by spit platform
and dune sand (Moslow and Tye 1985 , Fig. 12.12 ).
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