Archaean definition

Archaean means an early part of geological time dating from <4,000 to 2,500 million years ago “Artisanal” means local people conducting mining, often with rudimentary equipment
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Archaean means of geological ages older than 2,500 million years.
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Examples of Archaean in a sentence

  • The Archaean granitic shield contains elements of early sedimentary and mafic formations and a group of supracrustal greenstone belts with banded ironstone and detrital sediments.

  • The Project is located within the Western Gneiss Terrain of the Archaean Yilgarn Craton of south- west Western Australia (Figure 2).

  • Calc- alkaline granites form the latest Archaean magmatic event in the Craton.

  • The Kraaipan Greenstone Belt forms part of the Kaapvaal Craton and is overlain by late Archaean Ventersdorp lavas and tertiary sediments.

  • The significance of these microbial species is shown with network analysis in study of the microbial ecology of Deccan traps, India (deep biosphere hosted by ~65 Myr old Deccan basalt and Archaean granitic basement) (Gupta et al.

  • The Dharwar craton is one of classical and well-studied Archaean granite greenstone terrains of the world and is principally composed of low k-tonalitic to trondhjemitic gneisses (Peninsular gneiss) with infolded supracrustals (Sargur group) and capped by younger series of volcano sedimentary sequences (Dharwar super group).

  • In collaboration with ▇▇ ▇▇▇▇ ▇▇▇▇▇▇▇ at the NHM, this research visit sought to: - Investigate morphology and context of the earliest traces of life on Earth from the early Archaean (>3 billion years ago) of South America and Western Australia.

  • The granites being the youngest in point of age in the Archaean complex of Mysore are best described as "Younger Granites".

  • The Kalgold operation is located within the geological terrain of the Archaean Kraaipan Greenstone Belt.

  • The granites are unconformably overlain by the northwest trending Archaean age Musoma-Mara Greenstone Belt.