View example sentences, synonyms and word forms for Archaean.
Archaean
Archaean meaning
Of or relating to Arche, the Muse of beginnings in Greek mythology. | Of, or relating to the geologic eon from about 4,031 to 2,500 million years ago; comprises the Eoarchean, Paleoarchean, Mesoarchean and Neoarchean eras; marked by an atmosphere with little oxygen, the formation of the first continents and oceans and the emergence of simple life. | Of or relating to the irregular Jovian moon named for Arche.
Example sentences (4)
The DGB is characterised by a deeply weathered, metamorphosed succession of Archaean mafic, ultramafic, and felsic volcanic rocks with associated volcanogenic sedimentary rocks and thin units of banded chert and banded iron formation.
Nevertheless, ancient Archaean lead ores of galena have been used to date the formation of Earth as these represent the earliest formed lead-only minerals on the planet and record the earliest homogeneous lead-lead isotope systems on the planet.
Oxygen levels of the Archaean Eon were negligible and today they are roughly 21 percent.
Temperature Even though during the Archaean solar radiation was reduced by 30 percent and the Cambrian Precambrian boundary by six percent, the Earth has only experienced three ice ages throughout the Precambrian.