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

- Archaean may refer to: Archaean or Archean, a geologic eon between Hadean and Proterozoic Something related to Archaea, a domain of single-celled microorganisms...
- The Archean Eon (IPA: /ɑːrˈkiːən/ ar-KEE-ən, also spelled Archaean or Archæan), in older sources sometimes called the Archaeozoic, is the second of the...
- designations have practical meaning. Current knowledge on genetic diversity in archaeans is fragmentary, so the total number of species cannot be estimated with...
- theory is they were created by symbiogenesis between an anaerobic Asgard archaean and an aerobic proteobacterium, which formed the mitochondria. A second...
- volcanic sequences with ****ociated sedimentary rocks that occur within Archaean and Proterozoic cratons between granite and gneiss bodies. The name comes...
- of the Earth's history. The Pilbara Craton is one of only two pristine Archaean 3.6–2.7 Ga (billion years ago) crusts identified on the Earth. Having been...
- more recent works geologists often refer to both Ur and other proposed Archaean continental ****emblages as supercratons. Ur can, nevertheless, be half...
- A shield is a large area of exposed Precambrian crystalline igneous and high-grade metamorphic rocks that form tectonically stable areas. These rocks are...
- periods are characterised by magmatic activity leading to the formation of Archaean Tonalite-Trondhjemite-Granodiorite (TTG) such as the Sand River Gneisses...
- onto the northern and western margins of the evolving Kaapvaal shield. Archaean greenstone belts are hypothesized to have been formed from p****ive margin...