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Hadean

Also known as Priscoan Period, Priscoan, Pre-Archean, Pre-Archean period, Pre-Archaean, Pre-Archaean period, Hadean Eon

The Hadean ( ) is the first and oldest of the four geologic eons of Earth's history, starting with the planet's formation about 4.6 Ga (estimated 4567.30 ± 0.16 Ma set by the age of the oldest solid material in the Solar System—protoplanetary disk dust particles—found as chondrules and calcium–aluminium-rich inclusions in some meteorites about 4.567 Ga), and ending 4.031 Ga, the age of the oldest known intact rock formations on Earth as recognized by the International Commission on Stratigraphy. The interplanetary collision that created the Moon occurred early in this eon. The H

AI overview

The Hadean is Earth's oldest geologic eon, beginning with the planet's formation approximately 4.6 billion years ago and ending about 4 billion years ago with the oldest known intact rock formations. This eon is significant because it encompasses Earth's earliest history, including the giant collision that created the Moon, though our direct knowledge of this period is limited by the scarcity of surviving rock records from that time.

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

Key facts

Geologic timespan.color: Hadean
Geologic timespan.top_bar: all time
Geologic timespan.image_map: Artist's concept of collision at HD 172555.jpg
Geologic timespan.caption_map: Artist depiction of the hypothetical planet Theia colliding into Early Earth
Geologic timespan.image_art: Earearth.png
Geologic timespan.caption_art: Artist illustration of Earth and the Moon towards the middle/end of the Hadean eon
Geologic timespan.timeline: Eons
Geologic timespan.synonym1: Priscoan Period
Geologic timespan.synonym1_coined: Harland et al., 1989
Geologic timespan.celestial_body: earth
Geologic timespan.usage: Global (ICS)
Geologic timespan.chrono_unit: Eon
Geologic timespan.strat_unit: Eonothem
Geologic timespan.proposed_by: Preston Cloud, 1972
Geologic timespan.timespan_formality: Formal
Geologic timespan.lower_boundary_def: Age of the oldest solid material in the Solar System's protoplanetary disk (4567.30 ± 0.16) Ma
Geologic timespan.upper_boundary_def: Ten oldest U-Pb zircon ages
Geologic timespan.upper_gssa_location: Along the Acasta River, Northwest Territories, Canada

via Wikipedia infobox

Wikidata facts

Image: Hadean.png

Show 4 more facts

start time: 4567300000
end time: 4031000000
Commons category: Hadean
sRGB color hex triplet: AE027E

Sources (4)

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~10 min read

Article

11 sections

Contents

Etymology
Rock dating
Atmosphere
Oceans
Plate tectonics
Continents
Possible life
See also
References
Further reading
External links

Hadean rocks are very rare, largely consisting of granular zircons from one locality (Jack Hills) in Western Australia. Hadean geophysical models remain controversial among geologists: plate tectonics and the growth of cratons into continents may have started in the Hadean, but there is still uncertainty.