Geology of the Intermountain West,
Journal Year:
2022,
Volume and Issue:
8, P. 45 - 71
Published: Jan. 17, 2022
The
Upper
Cretaceous
Rock
Springs
Formation
of
the
Mesaverde
Group
in
northwestern
Colorado,
southwestern
Wyoming,
and
northeastern
Utah
is
composed
fluvial,
deltaic,
marine
sediments
that
record
regression
Western
Interior
Seaway
during
Early
to
Middle
Campanian.
Contemporaneous
deposits
are
present
along
eastern
southeastern
margins
Greater
Green
River
Basin
but
correlation
across
basin
challenging.
Analysis
a
small
(1-km-long),
understudied
outcrop
Colorado
assists
bridging
gap.
consists
distal
proximal
deltaic
deposits,
overlain
by
distributary-channel
complexes
within
delta-plain
deposits.
Correlation
panels
based
on
subsurface
wireline
logs
gamma-ray
profiles
show
younger
than
lithostratigraphically
equivalent
strata
Wyoming.
Regional
nomenclature
introduced
for
area,
it
shown
these
differ
from
better-documented,
older
Wyoming
having
higher
net
sandstone
percentage
due
presence
substantial
complexes.
This
study
benefits
exploration
efforts
providing
analogs
reservoir
distribution
quality.
Palaeogeography Palaeoclimatology Palaeoecology,
Journal Year:
2023,
Volume and Issue:
619, P. 111539 - 111539
Published: April 7, 2023
A
detailed
ichnological
analysis
has
been
conducted,
for
the
first
time,
of
Arenazzolo
and
Trubi
formations
Caltanissetta
Basin
in
Sicily.
Aim
this
is
to
evaluate
paleoenvironmental
changes
affecting
macrobenthic
tracemaker
communities
during
re-flooding
Mediterranean
at
end
Messinian
Salinity
Crisis.
The
uppermost
Formation
characterized
by
a
scarcity
trace
fossils,
probably
related
high
energy
depositional
conditions,
perhaps
no
fully
normal
salinity
level
yet,
resulting
an
unfavourable
habitat
communities.
exclusive
presence
small
traces
(Chondrites)
sparsely
distributed
several
horizons
associated
intermittent
phases
lower
conditions
facilitating
colonization
opportunistic
tracemakers.
significant
change
fossil
assemblages
observed
transition
Zanclean
Formation.
Here
ichnofossil
assemblage
consists
of?Arenicolites,
Chondrites,
Halimedides,
Palaeophycus,
Planolites,
Thalassinoides,
Trichichnus
Zoophycos,
assigned
Zoophycos
ichnofacies,
revealing
abundant,
diverse,
well-developed,
multi-tiered,
community.
This
Messsinian/Zanclean
boundary
rapid
establishment
normal,
full-marine,
with
well
oxygenated
bottom-
pore-waters,
food
availability
deep
marine
environment.
Comparison
previous
micropaleontological
studies
supports
magnitude
both
pelagic
benthic
environments.
Facies,
Journal Year:
2023,
Volume and Issue:
69(2)
Published: April 1, 2023
Abstract
The
palaeoenvironments
of
the
upper
Palaeozoic
succession
in
eastern
foot
slopes
Northern
Galala
Plateau,
west
Gulf
Suez,
Egypt,
are
interpreted
based
on
a
detailed
study
sequence-stratigraphic
framework,
sedimentary
facies
and
trace
fossils.
Carboniferous–lower
Permian
Aheimer
Formation
has
been
studied
its
type
section
exposed
Wadi
Aheimer.
Three
unconformities
bound
four
3rd-order
depositional
sequences,
including
Carboniferous
DS
NG
1,
lower
2‒4.
These
sequences
correlated
with
their
counterparts
North
African
Arabian
plates.
characteristics
indicate
ranging
from
fluvial,
estuarine,
intertidal,
shallow
subtidal,
shoreface
to
offshore
transitional
settings.
abundant
diverse
ichno-assemblages
composed
horizontal,
vertical
sub-vertical
traces.
At
least
26
ichnotaxa
have
identified,
representing
suites
Glossifungites
,
proximal
Cruziana
proximal-archetypal
ichnofacies.
Ichnofabric
analysis
revealed
three
distinct
ichnofabrics:
Tisoa
Schaubcylindrichnus
Zoophycos
ichnofabrics.
body
fossil
distribution
trophic
structure
some
recorded
faunal
assemblages
confirm
relatively
stable
low-stress
shallow-marine
environments.
In
contrast,
other
indicates
influence
particular
environmental
parameters,
substrate
consistency,
bathymetry,
water
energy,
productivity,
rate
sedimentation,
salinity
oxygen
availability.
integrated
results
that
were
formed
during
an
interval
dominated
by
different
perturbations
resulted
wide
spectrum
features.
Moreover,
evidence
for
Carboniferous–Permian
glaciation
is
tentatively
established
Egypt
but
require
further
investigations.
Journal of Palaeogeography,
Journal Year:
2023,
Volume and Issue:
12(4), P. 603 - 623
Published: Aug. 18, 2023
Early
Cretaceous
succession
of
the
Oued
Fodda
Formation
in
Ouarsenis
Mountains
(northwestern
Algeria)
is
mainly
composed
marl–limestone
alternations,
which
are
subdivided
into
four
informal
units
(Units
1
to
4),
based
on
distinct
lithological,
stratonomical,
and
ichnological
features.
The
analysis
reveals
a
low
diversity
trace-fossil
assemblage,
exclusively
reported
from
Units
2
3.
ichnoassemblage
contains
six
ichnotaxa
(Chondrites
intricatus,
Ophiomorpha
isp.,
Planolites
Thalassinoides
Zoophycos
brianteus,
cauda-galli),
among
Chondrites
most
common
elements
assemblage
occur
different
mud-rich
substrates
showing
bioturbation
intensities.
development
middle
part
Unit
shows
high
degree
(bioturbation
index
(BI)
=
4).
specimens
large
size,
between
45
cm
75
width,
were
interpreted
have
formed
lower
offshore
environment
where
oxygenation
amount
was
optimal,
sedimentation
rates
low,
benthic
food
abundant
seafloor.
Toward
upper
2,
Zoophycos-bearing
levels
exhibit
less
intense
(BI
2)
contrast
Planolites-
Chondrites-bearing
3
4.
At
these
levels,
displays
relatively
small,
coiled
U-shaped
spreiten,
probably
response
stressful
dysoxic
conditions
prevailing
water
bottom.
With
improved
quiet
shelf
margin
3,
organisms
recovered,
as
represented
by
medium
size
association
with
scarce
burrows,
even
if
overall
intensity
very
low.
combination
lithofacies
indicates
stable
outer
environments
below
storm
wave
base,
corresponds
classically
edge
environments,
palaeoecological
optimal
for
organisms.
Ichnos/Ichnos : an international journal for plant and animal traces,
Journal Year:
2023,
Volume and Issue:
30(2), P. 157 - 171
Published: April 3, 2023
AbstractWe
report
tetrapod
traces
and
associated
ichnofauna
from
two
stratigraphic,
dominantly
terrestrial
levels
of
the
Tiout
Formation
(Valanginian-latest
Albian
to
lower
Cenomanian)
in
Laghouat
Brezina
areas,
Central
Saharan
Atlas
(Djebel
Amour),
northwestern
Algeria
discuss
their
paleoecological
implications.
The
assemblages
display
abundant
footprints
that
show
similarities
with
crocodylian
swim
assigned
Hatcherichnus
known
Jurassic–Cretaceous
deposits
North
America
Morocco.
However,
there
is
also
some
similarity
shape
attributed
swimming
pterosaurs
by
different
authors.
Because
isolated
materials
lack
distinct
trackways,
we
leave
decision
on
tracemaker
open.
majority
are
tridactyl
tetradactyl
imprints
consisting
parallel
furrows
left
claws
or
buoyant
individuals.
Tetrapod
identified,
described,
figured
herein
for
first
time
Mesozoic
Algeria.
These
vertebrate
fossil
a
low-diversity
invertebrate
marine
ichnofauna,
including
cf.
Bergaueria
isp.,
Phycodes
Sinusichnus
seilacheri,
Thalassinoides
suevicus.
Together
body
data,
fishes
non-avian
dinosaurs,
they
indicate
diverse
animal
community
populating
fluvial
system
environment
influence.
Paleoecological
paleoenvironmental
features
add
new
information
ichnoassemblages
previously
reported
'mid'-Cretaceous
Africa.Keywords:
Swim
tracesinvertebrate
ichnofaunacontinental
intercalarypaleoecologySaharan
AtlasAlgeria
AcknowledgementsWe
grateful
reviewers
Martin
Lockley
Adrian
Hunt
valuable
comments
constructive
suggestions
helped
improve
preliminary
version
typescript.Disclosure
statementNo
potential
conflict
interest
was
authors.Additional
informationFundingThis
work
supported
General
Directorate
Scientific
Research
Technological
Development
'DGRSDT'
(Algeria).
