Geoscience Reference
In-Depth Information
Table 1. ( Continued )
Appearances
in logs,
not to scale
Bedding boundaries
and bed conditions
Ichnology
(index 0-6)
Facies
Sedimentology
Interpretation
Facies Association
6a
Fine-grained
wave ripple
cross-
laminated
sandstone
Moderately to well
sorted; homogenous;
fine-grained; wave-
ripples and wave-
modified current
ripples; absent very
thin discontinuous
mudstone and siltstone
drapes; cleaning-up
beds
Sharp lower boundary;
gradational
coarsening-up trend;
bed thickness 5 to
30 cm, bedset-scale
lateral extent > 10s
of km
Local sparse Th, Tei ,
Belemnite rostra 1 ;
intensity (0 to 1)
to high diversity
dominated by: As,
?Ch, Cy, Op, Pa-h,
Pl, Sk, Tei, Ter, Th ;
intensity (4 to 5).
Deposition of
dominating sand
as ripples during
dominant wave
and sub-dominant
current activity
and subsequent
deposition of mud
from suspension
during slack-water
stage
2A of tidal inclined
heterolithic strata
2B of tidal inclined
heterolithic strata
2C of tidal inclined
heterolithic strata
3D of tidal channel
infill
5A of mixed tide- and
wave-influenced
heterolithic delta
7A of wave-dominated
open-marine
7B (rare) of wave-dominated
open-marine
5B of mixed tide- and
wave-influenced
heterolithic delta
6b
Heterolithic
mudstone
and
sandstone
with
lenticular
bedding
Sharply inter-laminated;
very-fine to medium-
grained; laterally and
vertically isolated
ripple-laminae in
laminated/non-
laminated silt-stone
and mudstone
Sandstone bed
thickness 10 to
30 cm; muddy
siltstone beds 5 to
20 cm thick, bedset-
scale lateral extent
several km
Low to high intensity
(0 to 6). Dominant
ichnofabrics: Ter,
Pl, Ph, Ch, Th .
Deposition of sand as
incomplete ripples
during current
activity on a
muddy substratum;
some wave
modification
5A of mixed tide- and
wave-influenced
heterolithic delta
5B of mixed tide- and
wave-influenced
heterolithic delta
5C of mixed tide- and wave-
influenced heterolithic
deltaic deposits
7B of wave-dominated
open-marine
3D of tidal channel
infill
 
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