368
Tectonic Control of Fluvial Sedimentation
RIO GRANDE EMBAYMENT
SE
'
2
tl:
E e "o
�
"'
�
;;;
�,
FACIES ASSEMBLAGE
'
c:J Coosfol· plain fluvial
"
� Boy I lagoOn
� Pllrolic: shore·zone/dallaic
c:J Shelf and slope
'
c::J lntroslope basin
\
•
?
3pmi
0
30km
5
V. €.•40�
CRUST
20
CONTINENTAL
Fig. 11.28. Generalized dip-oriented stratigraphic cross
section through the Rio Grande depocenter, in the northwest Gulf Coast (location shown in Fig. 1 1.27), indicating
)
Fig. 11.29. Progradation of the Gulf Coast continental
margin by the development of clastic wedges during the
Cenozoic. Locations of the three principal embayments
ATTENUATED CONTL
principal Cenozoic clastic wedges. Many of these thicken
southward across contemporary growth faults. (Galloway
1989b, reprinted by permission)
/Shelf edge positionS
j;:f Principal drainage axis
� Focus of offlop
[I]Sond-rich continen!ol margin sequence
0
0
IOOmi
20 0km
(structural sags) through which rivers entered the coastal
plain are also shown. (Winker 1982; Galloway 1989b, reprinted by permission)