نخست‌زیستی دیرینه

Also known as Paleoarchean Era, Palaeoarchaean

The Paleoarchean ( ), 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 . The era is defined chronometrically and is not referenced to a specific level of a rock section on Earth. The earliest confirmed evidence of life comes from this era, and Vaalbara, one of Earth's earliest supercontinents, may have formed during this era.

Key facts

Geologic timespan.color: Paleoarchean
Geologic timespan.top_bar: all time
Geologic timespan.image_map: Vaalbara Continent.jpg
Geologic timespan.caption_map: Vaalbara, a hypothetical continent dating from 3.6 to 2.7 billion years ago
Geologic timespan.timeline: Paleoarchean
Geologic timespan.proposed_boundaries1: 4031–3490 Ma
Geologic timespan.proposed_boundaries1_ref: Gradstein et al., 2012
Geologic timespan.proposed_subdivision1: Acastan Period, 4031–3810 Ma
Geologic timespan.proposed_subdivision1_coined: Gradstein et al., 2012
Geologic timespan.proposed_subdivision2: Isuan Period, 3810–3490 Ma
Geologic timespan.proposed_subdivision2_coined: Gradstein et al., 2012
Geologic timespan.name_formality: Formal
Geologic timespan.alternate_spellings: Palaeoarchaean
Geologic timespan.synonym1: Early Archean
Geologic timespan.celestial_body: earth
Geologic timespan.usage: Global (ICS)
Geologic timespan.timescales_used: ICS Time Scale
Geologic timespan.chrono_unit: Era