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
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 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...