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 …
Revista Brasileira de Paleontologia,
Год журнала:
2019,
Номер
22(2), С. 89 - 96
Опубликована: Авг. 31, 2019
The
State
of
San
Luis
Potosí,
Mexico,
is
rich
in
fossils
and
has
a
long-standing
tradition
paleontological
research.Nevertheless,
most
these
studies
have
been
focused
on
vertebrates
invertebrates
body
fossils,
with
the
ichnological
record
being
overlooked.Here,
we
report
occurrence
ichnofossils
(Diplocraterion
parallelum,
Ophiomorpha
nodosa,
Skolithos
linearis,
Palaeophycus
tubularis)
from
Upper
Cretaceous
(Maastrichtian)
Cárdenas
Formation,
southeastern
Potosí.Invertebrate
trace
associated
suggest
that
Formation
was
deposited
low
to
high
energy
system,
occasional
storm
events,
shallow
water
platform
(delta
plain
or
coastal
paleoenvironment
influenced
by
tidal
action).
Mongolian Geoscientist,
Год журнала:
2024,
Номер
29(58), С. 55 - 79
Опубликована: Июнь 11, 2024
Pan
global
Permian
coal
measures
are
unique
in
the
evolution
of
Earth,
not
matched
any
period
before
or
since.
Middle
and
late
coal-bearing
strata
widely
distributed
Mongolia.
In
particular,
a
large
concentration
transtensive
sub-basins
is
located
southern
Mongolia,
some
which
well
documented.
However,
developed
along
shores
Mongol-Transbaikalian
Seaway
central
focus
this
contribution,
has
received
very
limited
attention.
This
study
focuses
on
c.
420
m
thick
middle
part
2,600
Permo-Triassic
succession
Bayanjargalan
district.
The
draws
data
from
38
drillholes,
3
km
trenches,
mapping,
petrological
analysis
sandstone
samples,
macroflora,
fauna
trace
fossils,
82
quality
samples
as
washability
ash
XRD
3t
bulk
sample.
unstable
wedge-shaped
architecture
seams
strongly
suggest
syn-tectonic
influence
their
development.
Paleoclimatic
indicators
peat
mire
ecosystem
during
relatively
cold
-
temperate
climatic
conditions.
Peat-forming
plants
such
Cordaites,
Rufloria
Koretrophyllites
probably
benefited
moist
air
currents
seaway.
Plant-arthropod
interactions
reported
two
sites,
particular
DT228
DT246
oviposition
lesions,
latter
being
almost
twice
size
previous
report
North
America.
Results
proximate
analyses
returned
consistent
high
yields
46.95%
(db)
43.45%
(adb)
sample,
unusual
for
coals
Journal of Iberian Geology,
Год журнала:
2024,
Номер
unknown
Опубликована: Июль 9, 2024
Abstract
The
Cenomanian
(Upper
Cretaceous)
sedimentary
rocks
of
the
External
Prebetic
(Betic
Cordillera)
in
Sierra
de
Montearagón-Carcelén
(SE
Spain)
record
transgression
and
flooding
continental
deposits
subsequent
development
an
inner
shallow
carbonate
platform.
transgressive
surface
is
densely
colonized
by
infaunal
trace-makers
Glossifungites
ichnofacies
(
Gastrochaenolites
),
which
indicate
sediment
starvation
erosion
as
well
colonization
a
firmground.
first
were
thick
calcarenite
bar
(2
to
11
m)
with
large-scale
cross-bedding
pointing
high-energy
environment
Rosselia
Ophiomorpha
)
confirms
loose
sandy
bottom
under
conditions.
overlaying
stratigraphic
succession
characterized
subtidal
laminated
marly
limestones
intertidal
rhizoliths
interpreted
mangrove
swamp
environment.
These
facies
are
organized
shallowing-upwards
sequences.
An
episodic
event
represented
bivalve-rich
representing
shell
lags
disarticulated
valves.
This
could
be
related
climatic
perturbation
evidenced
negative
excursion
δ
13
C
18
O.
successive
sequences
persisted
thanks
subsidence
tectonically
controlled
depocenters
located
south
Montearagón-Carcelén.
differential
subsidence,
increasing
thickness
towards
sector
study,
suggests
activity
listric
faults
that
depocenters.
report
this
very
extensive
developed
close
land
emerged.
