Conodont diversity, biostratigraphy, and environmental dynamics: Unravelling the Smithian-Spathian transition at Guryul Ravine, Kashmir
Gondwana Research,
Год журнала:
2025,
Номер
unknown
Опубликована: Апрель 1, 2025
Язык: Английский
Evolution and extinction in a supercontinental world: did the breakup of Rodinia provide metazoans with evolutionary salvation?
Australian Journal of Earth Sciences,
Год журнала:
2024,
Номер
71(6), С. 821 - 831
Опубликована: Июнь 19, 2024
A
time
discrepancy
of
at
least
200–300
million
years
exists
between
the
generally
accepted
onset
metazoan
evolution
as
currently
evidenced
from
fossils
compared
with
that
studies
molecular
level.
That
temporal
disparity
coincides
existence
and
subsequent
breakup
Rodinia
Supercontinent
when
earliest
evolutionary
crucibles
were
isolated
intracratonic
basins
rather
than
globally
connected
shallow
seaways
eras.
However,
discovery
fossil
evidence
to
complement
extrapolations
data
has
been,
continues
be,
hampered,
by
both
geographical
limitations
these
fact
any
such
would
conflict
global
geological
mindset
macrofossils
age
do
not
exist.
Yet
recently
identified
within
Amadeus
Basin
central
Australia
is
a
suite
macroscopic
dates
ca
850–840
Ma,
exemplifying
an
early
attempt
animal
restrictions
Supercontinent.
Such
crucibles,
however,
was
extremely
vulnerable
variations
in
climatic
conditions,
which
threatened
total
extinction
because
isolation
limited
distribution
denying
them
possibility
migrating
safer
havens.
The
suggests
perhaps
comprised
cycles
about
10
flourished
followed
climate
change
induced
void
50
100
years.
possibly
characterised
until
broke-up,
after
connections
smaller
oceans,
seas
narrow
waterways
provided
life
passageway
sanctuary
during
times
environmental
stress.
As
just
one
number
Rodinian-aged
basins,
it
likely
similar
metazoans
are
preserved
elsewhere
awaiting
discovery.
Язык: Английский
Three pulses of breaths toward three evolutionary shifts
Communications Earth & Environment,
Год журнала:
2024,
Номер
5(1)
Опубликована: Март 29, 2024
Oxygen
levels
in
the
ocean
increased
three
times
between
early
Ediacaran
and
Cambrian,
synchrony
with
major
developments
animal
evolution.
Язык: Английский
Interglacial dust, ocean fertilisation and Neoproterozoic earth oxygenation
The Depositional Record,
Год журнала:
2024,
Номер
unknown
Опубликована: Ноя. 29, 2024
Abstract
Feedback
processes
that
drove
Earth's
second
major
increase
in
ocean–atmosphere
oxygen
levels
during
the
Neoproterozoic
are
poorly
constrained.
Variability
seawater
redox
over
geological
timescales
is
commonly
linked
to
changes
biogeochemical
cycling
of
P
and
thus
rate
primary
production
generation
photosynthetic
oxygen.
In
modern
surface
ocean,
an
important
source
bioessential
micronutrients
(Fe,
Cu,
Co,
Zn,
Mo,
Cr
Ni)
aeolian
dust
derived
from
deserts
arid,
post‐glacial
landscapes.
It
interpreted
herein
glacial
retreat
following
Sturtian
(
ca
717
660
Ma)
Marinoan
650
635
snowball
glaciations
provided
copious
global
ocean.
Correlation
interglacial
siltstone
successions
palaeogeographical
context
suggests
such
accumulation
was
diachronous
concentrated
palaeo‐horse
latitudes
(30°
N
30°
S).
Delivery
this
continents
likely
reflected
steep
radiogenic
Sr
isotope
values
87
Sr/
86
Sr)
post‐Sturtian
carbonates,
δ
18
O
signatures
Cryogenian
zircons
subducted
marine
sediments.
Accumulation
sedimentary
organic
matter
also
peaked
periods,
suggesting
a
causal
link
between
glaciation,
production.
This
relationship
implies
windblown
for
evolving
biological
pump
stimulated
production,
enhanced
burial
carbon
increased
concentrations.
Thus,
delivery
ocean
critical
sustaining
Sequestration
atmospheric
CO
2
organic‐rich
siltstones
shales
have
been
negative
feedback
process,
which
together
with
silicate
weathering,
prevented
runaway
greenhouse
conditions
periods.
The
produced
by
may
helped
pave
way
evolution
multicellular
animals
Ediacaran.
Язык: Английский