Eustatic, tectonic and climatic controls on an early syn-rift mixed-energy delta, Tilje Formation (Early Jurassic, Smørbukk field, offshore mid-Norway) - From Depositional Systems to Sedimentary Successions on the Norwegian Continental Margin - page 361

FA8: Tidal-
fluvial chan-
nels

F1, F2,
F3, and
F5.1

Sand dominated.
Coarse to fine-
grained sand-
stones. Local
conglomer-
ates (20 cm to
40 cm thick),
compound
fluid-mud
layers (up to
15 cm thick).

Cross-bedding,
current-ripple
cross- lamination
(bipolar),
herringbone
cross- stratification,
parallel
lamination, double
mud-drapes.

Stacked fining-upward
successions (1 m to 5 m thick).
Erosionally based conglomer-
ates overlie by cross-bedded
sandstones with basal rip-up
mud clasts and/or fluid-mud
layers followed by ripple cross-
laminated sandstones and
sand-dominated heterolithics.

Low to absent.
Skolithos .

Skolithos , large
Diplocraterion , and
locally Planolites .

Migration of dunes in tidally
influenced fluvial chan-
nels. High-energy current-
dominated. Episodic
brackish-water conditions.

FA9: Hetero-
lithic tidal
bars

F5.1,
F5.2.1,
and
F5.5

Mixed sand-mud
and sand-
dominated
heterolithics.
Medium to
fine-grained
sandstone.
Laminated to
homogeneous
mudstone.
Inclined mud-
stones dipping
5 degrees (IHS).

Current-ripple cross-
lamination (bipo-
lar), cross-bedding,
syneresis cracks,
stylolites, double
mud drapes,
parallel lamination.

Overall successions (up to 5 m
thick) displaying upward
thinning of the interbedded
sandstone and mudstone
layers. Locally, sharp-based
stacked, upward sandier
intervals. Rare upward-
coarsening heterolithic
successions.

Low to absent.
Skolithos .

Skolithos , large
Diplocraterion , and
locally Planolites
and Paleophycus .

Elongate tidal bars or
bank-margin tidal point
bars. Moderate to high
energy. Stressed brackish-
water conditions with high
sedimentation rates.

FA10: Inter-
distributary
bay deposits

F6.5,
F5.3.1,
F5.2.1,
F6.3,
and
F5.1.

Mixed silt to
very fine-
grained
sandstone and
mudstone.

Current-ripple
cross-lamination
(bipolar), parallel
lamination, len-
ticular bedding,
wave ripples,
wavy bedding.
Organic lenses are
common.

Upward thickening and
sandier successions (up to
3 m thick). Mud-dominated
heterolithics passing upward
into mixed sand-mud and
sand- dominated heterolithics
capped by rooted sandstones
and siltstones.

Moderate to
intense. Mixed
Cruziana and
Skolithos .
Deposit-feeders
and plant roots.

Planolites, Paleo-
phycus , small-scale
Skolithos, Dip-
locraterion , and
Ophiomorpha .
Rare oblique trace
fossils. Plant roots.

Prograding minor mouth-
bar or tidally influenced
interdistributary bay. Low
wave energy. Local aggrada-
tion to water level. Local
channel deposits by excess
discharge from distributary
channels.