340
Chapter 7 Sequences, Minor Cycles, and Event Stratigraphy
a VALLEY INCISION
AND REDEPOSITION
OF SEDIMENT
HEADWARD
VALLEY INCISION
SUBAERIAL
VALLEY INCISION
SUBMARINE STORM AND
CURRENT EROSION
(SHOWN FOR TRANSITION
FROM STAGE 1 TO 2)
SHELF
DELTA
b MODEL OF INCISED VALLEYS ON SHELF AND COASTAL PLAIN
PLAN VIEW
NOT AFFECTED
BY Sl-CHANGE
BEDRO CK
- - ./ :/ ~
C LONGITUDINAL, SECTION OF INCISED VALLEY
(TRANSGRESSIVE PARASEQUENCES)
\I
LTAS OF TST \\
\\
SHELF EDGE
SEA LEVEL
=-=--~1~ 2
---~- 3
. ~ REDEPO -
... ~, SITION
,,~
SLOPE
LOWSTAND
DELTA
,- -;-:, ;,-::-~~'~~~~~:\
.. .. i
,
~. _ .. \ ... ) , J .... I ... r'" f
... a
. . . . . . . . . . . . . ~ . " . .... ...... . _ •
/
GRAVITY FlOW
~
DEPOSIT
~
~ SLOPE BASIN
'l DEPOSIT
/
50 km
PROGRADING
__ __ - - - - - - -- - - -- - - - - - - - - - - - -SANDS
TRANSGRESSIVE
I
d CROSS-SECTION OF AlLUVIAL-DEL T AIC PLAIN
PlEISTOCENE ( > 20 kaI
I
RAVINECOASTAL SANDS
I
WATER DEPTH
",50 m
I
I
PRESENT-DAY
RIVER COURSE
2 km