- The
Archean Eon ( /ɑːrˈkiːən/ ar-KEE-ən, also
spelled Archaean or
Archæan) is the
second of four
geologic eons of Earth's history,
representing the time...
-
early from the Archaea, and that
eukaryotes arose through fusion of an
archaean and eubacterium,
which became the
nucleus and cytoplasm; this hypothesis...
- more
recent works geologists often refer to both Ur and
other proposed Archaean continental ****emblages as supercratons. Ur can, nevertheless, be half...
-
Archaean may
refer to:
Archaean or Archean, a
geologic eon
between Hadean and
Proterozoic Something related to Archaea, a
domain of single-celled microorganisms...
- of a
billion years ago Ur –
Proposed archaean supercontinent from
about 3.1
billion years ago Vaalbara –
Archaean supercontinent from
about 3.6 to 2.7...
-
Rocks of
almost all
geological ages are
represented at outcrop, from the
Archaean onwards.
Seismographical research shows that the
crust of the
Earth below...
-
There has been some
debate as to when and even if
Vaalbara existed. An
Archaean-Palaeoproterozoic (2.8–2.1 Gya) link
between South Africa and
Western Australia...
-
volcanic sequences with ****ociated
sedimentary rocks that
occur within Archaean and
Proterozoic cratons between granite and
gneiss bodies. The name comes...
- A
shield is a
large area of
exposed Precambrian crystalline igneous and high-grade
metamorphic rocks that form
tectonically stable areas.
These rocks are...
- the
roots of the
eukaryotes are to be
found in (or at
least next to) the
archaean asgard group,
perhaps Heimdallarchaeota (an idea
which is a
modern version...
