Geoscience Reference
In-Depth Information
Table 1.
Summary of facies recorded in the Neill Klinter Group, Jameson Land Basin, East Greenland. Intensity of bioturbation is described using the bioturbation index
scheme of Taylor & Goldring (1993).
Appearances
in logs,
not to scale
Bedding boundaries
and bed conditions
Ichnology
(index 0-6)
Facies
Sedimentology
Interpretation
Facies Association
1a
Lithic
conglomerate
Non-stratified to weakly
stratified or graded;
very poorly sorted
extra-basinal lithic
pebbles up to clasts
9 cm in diameter,
rounded to sub-
rounded; intra-basinal
tree trunks, mudstone
chips, marine body
fossils
Erosional lower and
sub-horizontal sharp
or gradational upper
boundaries; bed
thickness 5 to 30 cm,
lateral extension
from < 10 m up to
several km
Unbioturbated (0);
Belemnite rostra
1
;
Occasional vertical
burrows from
overlying substrate:
Di, ?Mo, Sk
; low
intensity (1 to 2)
Deposited either as
fluvially derived
conglomerate;
marine ravinement
lag; gravitational
sheet flow or
by traction in
pro-deltaic, delta
front, offshore
environment
1A of fluvial-tidal transition
1B of fluvial-tidal transition
1C of fluvial-tidal transition
2A
†
of tidal inclined
heterolithic strata
3A
†
of tidal channel infill
3D
†
of tidal channel infill
5B
†
of mixed tide- and wave-
influenced heterolithic delta
6A* of wave-dominated
brackish-marine
embayment mudstone
and siltstone
1b
Mud clast
conglomerate
Matrix-supported; poorly
sorted; mudstone clasts
dark red-brown, well
rounded, elongated,
weakly imbricated or
trough cross-stratified,
cm to dm in diameter;
common angular to
rounded extra-basinal
lithic clasts, organic
debris
Erosional lower
boundary; upper
boundary sharp and
sub-horizontal or
erosional (relief < 5
to 7 cm); bed
thickness 5 cm to
1 m, lateral extent m
to 10s of m
Unbioturbated (0)
Mud rip-up
conglomerate
deposited as
shallow tidal
channel-fill
on tidal delta
platform/intra-tidal
and/or supra-tidal
mudflats
1B of fluvial-tidal transition
3E of tidal channel infill
2A
†
of tidal inclined
heterolithic strata
2B
†
of tidal inclined
heterolithic strata
3B
†
of tidal channel infill
3D
†
of tidal channel infill
2
Cross-stratified
sandstone
Immature; poorly to well
sorted; fine-grained to
very coarse-grained;
distinct normal grading
trend; trough-bedded
and planar cross-
bedded; intra-basinal
debris, angular to
subrounded quartz
pebbles, feldspar,
lithic grains in thin
beds, organic debris,
angular to rounded,
cylindrical cm to dm
size mudstone rip-up
clasts; poorly to well
cemented; floating
Commonly erosive
base; upper
boundary gradational
fining-up; common
reactivation surfaces;
bed thickness
10 cm < 3 m; trough
width > 2 m; bedset
thickness 2 to 5 m,
lateral extent 100 m
up to km
Unbioturbated
(0); Rare
Ar
,
Sk
,
Ph, Tae, Pl,
Di
; horizontal
locomotion traces;
low intensity (0 to
2); lacustrine fauna
and terrestrial flora
generally dominate
over marine fauna
Deposited by
oblique or traverse
migration of 2D
and 3D dunes and
bars in braided
fluvial and/or
tide-influenced
sinuous to
straight channels;
occasional mud
drapes, rip-ups and
fluid mud layers
suggest some tidal
influence
1A of fluvial-tidal transition
1B of fluvial-tidal transition
1C of fluvial-tidal transition
3E of tidal channel infill
4B of wave-dominated
shoreface
2B of tidal inclined
heterolithic strata
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