Autogenic process change in modern deltas: lessons for the ancient - From Depositional Systems to Sedimentary Successions on the Norwegian Continental Margin - page 159

(A)

Palaeo-seaward direction

E

W A2

A1

A2

Tr ansgressive system tracts

A1

10

W

5

F

F

1

5

mud vf c

W

sand

10 m

1km

1

mud vf c

sand

(B)

Pa laeo-seaward direc tion

S N

B1 B1 B2

B2

10

Ch

15

Ch

5

F

10

1

5m

200 m

5

mud sand vf c

T

1

mud sand vf c

(C)

P alaeo-seaward direc tion

SE

NW

C1

C1

10

F

F - fluvial-dominated
W - wave-dominated
T - tidal-dominated
Ch - channel

5

Ch

Wave

1m

50m

T

1

mud sand vf c

Fluvial channel (distributary)
Prodelta (undifferentiated)
Syn-sedimentary deformation
Measured section location

Tide-dominated delta front
Fluvial-dominated delta front
Wave-dominated delta front
Wave-dominated delta front (distal)

Fig. 7. Ancient outcrop examples of autogenic delta process change. (A) Chimney Rock Member (Plink-Bjorlund, 2008).
(B) Fox Hills sandstone (Carvajal & Steel, 2009). (C) Wall Creek Member (Gani & Bhattacharya, 2007). Note that changes
between delta front deposits with different dominant processes occur over short distances (hundreds of metres).