Definition of Archaean. Meaning of Archaean. Synonyms of Archaean
Here you will find one or more explanations in English for the word Archaean.
Also in the bottom left of the page several parts of wikipedia pages related to the word Archaean and, of course, Archaean synonyms and on the right images related to the word Archaean.
Definition of Archaean
Archaean Ar*ch[ae]"an, n. (Geol.)
The earliest period in geological period, extending up to the
Lower Silurian. It includes an Azoic age, previous to the
appearance of life, and an Eozoic age, including the earliest
forms of life.
Note: This is equivalent to the formerly accepted term Azoic,
and to the Eozoic of Dawson.
Meaning of Archaean from wikipedia
- The Archean
Eon ( /ɑːrˈkiːən/ ar-KEE-ən, also spelled Archaean
) is the second
of four geologic
eons of Earth's history, representing
from the Archaea, and that eukaryotes arose through fusion
of an archaean
and eubacterium, which became
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...
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
3.1 billion years
ago Vaalbara – Archaean supercontinent
3.6 to 2.7...
ages are represented
at outcrop, from the Archaean
onwards. Seismographical research shows
that the crust
of the Earth
has been some debate
as to when and even if Vaalbara
existed. An Archaean
-Palaeoproterozoic (2.8–2.1 Gya) link between South Africa
- volcanic sequences
with ****ociated sedimentary rocks
that occur within Archaean
and Proterozoic cratons between granite
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
- 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
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