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The Archean Eon (IPA: / ɑːr ˈ k iː ə n / ar-KEE-ən, also spelled Archaean or Archæan), in older sources sometimes called the Archaeozoic, is the second of the four geologic eons of Earth's history, preceded by the Hadean Eon and followed by the Proterozoic.
The Paleoarchean (/ ˌpeɪlioʊ.ɑːrˈkiːən, ˌpæl -/ PAY-lee-oh-ar-KEE-ən, PAL-), also spelled Palaeoarchaean (formerly known as the early Archean), is a geologic era within the Archean Eon. The name derives from Greek "Palaios" ancient. It spans the period of time 3,600 to 3,200 million years ago.
Az eon a legnagyobb időegység a földtörténeti időskálán a Föld történetének tagolásában. A teljes földtörténetet négy eonra osztják: Hadaikum; Archaikum; Proterozoikum; Fanerozoikum; Az eon rétegtani megfelelője az eonotéma. Egy-egy eont érákra osztanak.
Archaik (ang. Archean, od gr. arche ‛na przedzie’), archeozoik (z gr. dzoe ‛życie’), azoik (z gr. ‛bez życia’) w sensie geochronologicznym: drugi najstarszy eon w dziejach Ziemi po hadeiku, trwający ok. półtora miliarda lat (od 4,0 do 2,5 mld lat temu). Archaik dzieli się na cztery ery: eoarchaik, paleoarchaik, mezoarchaik i neoarchaik.
15 paź 2024 · The Archean Eon was preceded by the Hadean Eon, an informal division of geologic time spanning from about 4.6 billion to 4 billion years ago and characterized by Earth’s initial formation. Records of Earth’s primitive atmosphere and oceans emerge in the earliest Archean (Eoarchean Era).
The Eoarchean (IPA: / ˌiːoʊ.ɑːrˈkiːən / EE-oh-ar-KEE-ən; also spelled Eoarchaean) is the first era of the Archean Eon of the geologic record. It spans 431 million years, from the end of the Hadean Eon 4031 Mya to the start of the Paleoarchean Era 3600 Mya.
11 kwi 2024 · The Archean Eon, which lasted from 4.0–2.5 billion years ago, is named after the Greek word for beginning. This eon represents the beginning of the rock record. Although there is current evidence that rocks and minerals existed during the Hadean Eon , the Archean has a much more robust rock and fossil record.
