122
Chapter 3 Coastal and Shallow Sea Sediments
a
BARRIER ISLAND
UPBUILDING
SEOUENCE
TIDAL FLATS
MARSH
~-c~==7E3~;:~~~~
WASHOVER .---/
SHORE
FACE
. /
EBB TIDAL
DELTA SANDS
SPIT
BEACH
SAND
WAVE
SHOREFACE
"::::=':;:::;:~L. TROUGH
, CROSS~~· ·..-;r- PLANAR ) BEDDING
~~~r BACKSHORE
FORESHORE
UPPER
I
I SHOREMIDDLE I
I FACE
I
LOWER )
BIOTURB .
. /
/
.--Fig. 3.18. aSediments of a barrier-island complex
and lagoon in microtidal to mesotidal environment.
Here upbuilding of sediments is assumed with laterally shifting inlets. b Seaward or landward migrating
barrier-island chain and resulting prograding (regresLAGOON
EOLIAN
SAND
CHANNEL
FORESHORE
SHOREFACE
b
\
\
\
\ I
I
I
WASH I
~~:;a.. OVER I
SAND I
MARSH
I
I
TIDAI...
CHANN"EL
1
10m
1
,.:::;~~t FLOOD TIDAL
.I \ ...
I \ :~
J , ~ ::
DEL T A, SANDS
LAGOONAL MUD,
BIOTURBATED
CHANNEL SANDS (JNLET)
MUD CLASTS, LAG DEP.
TRA NSGRES SI V E
BARRIER
-
SHOREFACE
".c:=.::::::::zI
BACKSHORE
DUNE
WASHOVER
MARSH
(COAL LENSES)
~== .... - WASHOVER
TIDAL FLAT
r-:P::>::::'~t- FLOOD TIDAL
DELTA
SUBAOUEOUS
LAGOON
• SHELLS, DEBRIS
sive) or transgressive sedimentary sequences. Note
that parts of these sequences may be lost by erosion
(cf. Fig. 3.17d). (Based on Elliott 1986; Reinson
1992; and others)