原生代

Also known as Proterozoic Eon

The Proterozoic ( ) is the third of the four geologic eons of Earth's history, spanning the time interval from to Ma, and is the longest eon of Earth's geologic time scale. It is preceded by the Archean and followed by the Phanerozoic, and is the most recent part of the Precambrian "supereon".

AI overview

The Proterozoic is the longest division of Earth's history, lasting roughly two billion years and occurring between the Archean and Phanerozoic eons. It matters because understanding this vast span of time helps scientists piece together the deep history of Earth before the emergence of most visible life forms that characterize the Phanerozoic eon.

AI-generated from the Wikipedia summary — may contain errors.

Key facts

Geologic timespan.name: Proterozoic
Geologic timespan.color: Proterozoic
Geologic timespan.top_bar: all time
Geologic timespan.image_art: Proterozoic collage new.png
Geologic timespan.caption_art: From left to right: Four main Proterozoic events: Great Oxidation Event and subsequent Huronian glaciation; First eukaryotes, like red algae; Snowball Earth in Cryogenian period; Ediacaran biota
Geologic timespan.timeline: Eons
Geologic timespan.name_formality: Formal
Geologic timespan.celestial_body: earth
Geologic timespan.usage: Global (ICS)
Geologic timespan.timescales_used: ICS Time Scale
Geologic timespan.chrono_unit: Eon
Geologic timespan.strat_unit: Eonothem
Geologic timespan.timespan_formality: Formal
Geologic timespan.lower_boundary_def: Defined Chronometrically
Geologic timespan.upper_boundary_def: Appearance of the Ichnofossil Treptichnus pedum
Geologic timespan.upper_gssp_location: Fortune Head section, Newfoundland, Canada

via Wikipedia infobox

Wikidata facts

Instance of: eonothem
Has part: Neoproterozoic
Followed by: Phanerozoic
Follows: Archean

Show 6 more facts

start time: 2500000000
Commons category: Proterozoic
end time: 538800000-
topic's main category: Category:Proterozoic
sRGB color hex triplet: F73563
IPA transcription: /ˌproʊtərəˈzoʊɪk/

Sources (4)

via Wikidata · CC0

Article · 日本語

原生代（げんせいだい、Proterozoic）とは、地質時代の区分（累代）のひとつ。真核単細胞生物から硬い骨格を持った多細胞生物の化石が多数現れるまでの25億年前〜約5億4,100万年前を指す。元々は、先カンブリア時代以前の全ての時代を指していた。冥王代、太古代、原生代をまとめて先カンブリア時代と呼ぶこともある。太古代の次の時代で、古生代（カンブリア紀）の前の時代である。シアノバクテリアの活動によって大気中に酸素の放出が始まり、オゾン層ができて紫外線が地表に届かなくなった。また、古細菌類から原始真核生物が分岐し、さらにαプロテオバクテリア（後のミトコンドリア）が共生することで現在の真核生物が成立した。後期には多細胞生物も出現した。

Abstract from DBpedia / Wikipedia · CC BY-SA