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
8
Structureless
sandstone
Unstratified; very well
to very poorly sorted;
medium-grained to
coarse-grained; rare
floating terrestrial
and marine body
fossils; lithic pebbles;
rare green to black
secondary colouring;
chlorite-coated
sub-angular to sub-
rounded quartz grains;
glauconite grains; cm
to dm-size sideritic
concretions
Sharp to gradational
lower and upper
boundaries; bed
thickness 0.2
to 1.5 m, lateral
extent < 100 m
Unbioturbated (0 to
1); locally high
intensity beds (6) -
unspecified; thick
walled oysters (6)
Deposition by waves
in shoreface; rapid
deposition from
gravity flows or
collapse.
Deposition by tides
and waves as rare
dark green or black
beds of iron-rich
reducing iron-
ooid horizons;
as structureless
chlorite-coated and
glauconitic quartz
sands from iron-
rich source areas
4A of wave-dominated
shoreface
6B of brackish-marine
embayment
3A
†
of tidal channel infill
3B
†
of tidal channel infill
3C
†
of tidal channel infill
3D
†
of tidal channel infill
5B
†
of mixed tide- and
wave-influenced
heterolithic delta
5C
†
of mixed tide- and
wave-influenced
heterolithic delta
9
Structureless
muddy
siltstone and
sandstone
Consolidated or loose;
coarsening-up;
occasional weak wave
ripple laminae or
trough cross-stratified;
rare flow ripples; rare
carbonaceous cone-
in-cone structures,
floating organic debris
and lithic clasts
Sharp unconformable
to gradational
lower and upper
boundaries; bed
thickness 5 cm up
12 m, lateral extent
from few m up to
few km
Consolidated
fraction: high
intensity (3 to 5)
Ter, Pl, Ph, Ch, Th
;
common floating
marine body fossils
and fully marine
fauna.
Loose fraction:
unbioturbated
(0); dominant
terrestrial fauna
and flora
Deposition from
suspension in well
oxygenated fully
marine offshore
to distal pro-delta
environment;
discontinuous
sedimentation
rates; intense
biological activity.
Deposition from
suspension
in low-energy
environment with
carbonaceous
debris
6A of brackish-marine
embayment
6B of brackish-marine
embayment
1C
†
of fluvial-tidal transition
4B
†
of wave-dominated
shoreface
5B
†
of mixed tide- and
wave-influenced
heterolithic delta
5C
†
of mixed tide- and
wave-influenced
heterolithic delta
7A
†
of wave-dominated
open-marine
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