Introduction
455
A. PASSIVE MARGIN MODEL
@ TRANSGRESSIVE DEPOSITS
8 0 0
CONOENSEO
SCCTION
!
Sl.lllAERIIIL
8
EROSION
CONOENSEO
S�CTION
HEGH
'�
LM SEAWARD
SEAUVH
COASTAl ONVP
B. FORELAND BASIN MODEL
@ REGRESSIVE DEPOSITS
-
�
lOO
HIGH
COASTAL 0Ni.JIP
Fig. 13.1A1B. Comparison of sequence architecture on ex�
tensional continental margins (A) and in fo reland basins
(B). Note the much thicker record of nonmarine deposits
in fo reland basins. These deposits also have a higher pres�
ervation potential than the highstand deposits of exten�
-
RAVINEMENT
-
CONOENSEO
HORIZON
CONFORMABLE
60UNOARY
OFFSHORE MARINE
EROSION SURFACE
SUBAERIAl EROSION
SURFACE
SENSE OF SHORELINE
'"'"""" "'
sional continental margins, because of the slow subsidence
rates on the proximal margins of such basins and the
tendency for nonmarine HST deposits to be eroded during
subsequent base� level falls. (Swift et al. 1987)