The study focuses on occurrences of Ophiomorpha burrows in a transgressive–regressive succession composing the Early Paleocene Firkanten Formation deposited in paralic, prodelta to delta front conditions in the Central Basin of Spitsbergen. The burrows colonize sandstones of the Todalen Member at four sites and belong to two ichnospecies: Ophiomorpha cf. nodosa, forming dominantly vertical shafts; and O. cf. irregulaire, consisting of horizontal sinuous tunnels ending in subconical shafts. Both species are observed in shoreface sandstones deposited as a barrier bar. Lithological features and stratigraphic positions suggest that the trace-makers preferentially colonized high-energy sand environments. Foraminiferal faunas occurring below and above …
Geological Journal,
Journal Year:
2022,
Volume and Issue:
57(7), P. 2828 - 2853
Published: March 28, 2022
The
carbonate‐dominated
successions
of
the
Tirgan
Formation
(Latest
Barremian‐Early
Aptian)
in
Kopet‐Dagh
Basin
(Iran)
were
studied
to
decipher
tectonic
and
eustatic
sea‐level
effects,
as
well
autogenic
influence
on
lateral
vertical
facies
changes,
depositional
environment,
sequence
stratigraphy
tide‐wave‐dominated
sediments
at
northern
margin
Neo‐Tethys
Ocean.
Fourteen
identified
sequences,
here
grouped
into
five
associations
according
setting:
tidal
flat
(A),
lagoon
(B),
shoal
(C),
shallow
open‐marine
(D),
deep‐open
marine
(E).
A
third‐order
sequence,
including
a
transgressive
system
tract
(TST)
highstand
(HST)
was
also
identified,
along
with
several
medium‐
small‐scale,
thickening‐
shallowing‐upward
cycles
(parasequences).
development
parasequences
controlled
by
interactions
between
allogenic
(tectonic
eustasy)
factors
(wave
hydrodynamic
regimes).
mainly
affected
stacking
pattern
parasequence
TST
deposits
lower
part
Formation,
characterized
association.
Autogenic
display
main
formation
HST
related
parasequences,
open‐marine‐lagoon–shoal
developed
upper
Formation.
tectono‐sedimentary
model
for
evolution
carbonate
platform
represented
may
be
useful
further
studies
sedimentary
basin
or
palaeogeographic
reconstructions
margin.
Geological Society London Special Publications,
Journal Year:
2022,
Volume and Issue:
522(1), P. 237 - 264
Published: June 21, 2022
Abstract
Albian
dinosaur
tracks
from
the
Monte
Grande
Formation
(Basque–Cantabrian
Basin)
are
described.
Sedimentary
succession
shows
seven
different
facies
associations
(FAs)
with
four
track-bearing
levels
(levels
1–4)
of
a
braid
delta
system.
FA
4,
proximal
crevasse
subdelta,
preserves
in
2
and
3
theropod,
possibly
sauropod
undetermined
tracks,
as
well
Ophiomorpha
Skolithos
traces.
5,
middle
presents
cross-section
1
besides
,
locally
Teichichnus
other
layers.
Both
FAs
have
same
general
ichnoassociation,
although
preservational
variations.
The
sedimentary
represents
an
area
periods
subdelta
progradation
colonization
opportunistic
organisms,
abandonment
represented
by
short
hiatuses
which
water
sheet
would
be
shallow
or
even
absent
where
dinosaurs
roaming.
Particularly,
traces
represent
ichnocoenosis
constituting
two
suites
may
envisaged
penecontemporaneous,
produced
within
short-term
window.
This
tracksite
is
one
scarce
ichnological
records
southwestern
European
island
palaeoarchipelago
few
worldwide
localities
been
found
deltaic
facies.
Geologos,
Journal Year:
2018,
Volume and Issue:
24(1), P. 29 - 53
Published: March 1, 2018
Abstract
The
Coniacian
quartz
sandstones
(Żerkowice
Member,
Rakowice
Wielkie
Formation)
that
crop
out
at
quarries
near
Czaple-Nowa
Wieś
Grodziska
(North
Sudetic
Synclinorium)
contain
a
low-diversity
assemblage
of
trace
fossils:
Gyrochorte
isp.,
Ophiomorpha
nodosa
Lundgren,
1891,
Phycodes
cf.
curvipalmatum
(Pollard,
1981),
?
Planolites
beverleyensis
(Billings,
1862),
Thalassinoides
paradoxicus
Woodward,
1830
and
isp.
Moreover,
interesting
compound
burrow
systems,
here
referred
to
as
-
palmatus
,
were
recognised
the
Czaple
Quarry.
Additionally,
flabellum
(Miller
Dyer,
1878)
Treptichnus
encountered
correlative
levels
in
Małe
Some
these
ichnotaxa
have
not
been
recorded
previously
from
Żerkowice
Member.
slabs
sandstones,
gastropod
Nerinea
bicincta
Bronn,
1836
bivalve
Lima
haidingeri
Zittel,
1866
found.
These
finds,
particular
gastropods,
already
noted
study
area
first
half
twentieth
century
by
Scupin
(1912–1913).
Ethologically,
fossil
is
represented
domichnia
or
domichnia/fodinichnia
(
),
fodinichnia
)
pascichnia
).
systems
are
interpreted
dwelling/feeding
structures.
possible
tracemakers
crustaceans
worm-like
animals
(annelids
other)
fossils
characteristic
Skolithos
ichnofacies
Cruziana
ichnofacies,
typical
shallow-marine
settings.
Ichnological
studies,
well
presence
accompanying
(bivalves,
gastropods),
confirm
palaeoenvironmental
reconstruction
Member
Leszczyński
(2010).
That
author
bar
storm
deposits
laid
down
shallow
epicontinental
sea
(mainly
foreshore-upper
shoreface;
up
middle
shoreface)
under
normal
oxygenation
salinity,
soft
substrate,
above
fair-weather
wave
base.
deposition
linked
regression
started
after
uplift
southeastern
part
North
Synclinorium.
