Tectonic influence on the Jurassic sedimentary architecture in the northern North Sea with focus on the Brent Group - From Depositional Systems to Sedimentary Successions on the Norwegian Continental Margin - page 404

S
(A)

(B)

34/11-2 S

N

Silt Medium sand

34/10-23

Mudstones
Siltstones
Sandstones
Coal-layer
Rooted horison
Mud drapes
Flaser bedding
Lenticular bedding
Syneresis crack
Shell material
Coal fragment
Mud clasts
Igneous clast
Calcite cement
Phosphate cement
Bioturbation intensity
Climbing current ripples
Current ripples
Wave ripples
Hummock and swales
Low-angle
High-angle
Trough
Undulating bedding
Horisontal bedding
Sharp boundary
Erosive boundary

C m

Medium
sand

Gr To p Ta rbert Fm.

WD
m

CD
m

4070

Silt

0 150

10

4080

4080 4080

4090

4090 4090

4100

4100

4100

0

cm

4110

4110 4110

4120

4120 4120

4130

4130 4130

34/10-23
4117.75 m MD

4140

4140 4140

4150

4150 4150

4160

4160

4160

4170

4170 4170

10

4180

4180 4180

Cross-
bedding

4190

4190 4190

4200

4200 4200

0

cm

4210

4210 4210

4220

WD:Well depth in metres
CD: Core depth in metres

4220 4220

4230

4230 4230

34/10-23
4268.80 m MD

4240

4240 4240

4250

10

4250 4250

4260

4260

4260

4270

4270 4270

0

cm

4280

4280 4280

4290

4290 4290

4293,9

4300

4300

34/10-23
4271.00 m MD

4310

4310

20

(C) 35/11-7

Gr

Silt Medium sand

WD
m

CD
m 0 150

0

cm

35/11-7
2468.00
2469.00

2469.00
2470.00

2470.00
2471.00

2471.00
2472.00

2472.00
2473.00

m MD
m MD

Fig. 9. (A) Log of the Brent Group in well 34/10-23 with the base Ness sandstone indicated. The palaeosol at the top of the
Etive Fm is illustrated in the photo from 4271 m. The photo at 4268.8 m shows weak but rhythmic mudstone-drapes of the