Precambrian Supereon

E42694

geological time interval supereon

The Precambrian Supereon is the vast span of Earth's early history before the Phanerozoic, encompassing the Hadean, Archean, and Proterozoic eons during which the planet formed, life first appeared, and early continents and atmospheres developed.

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All labels observed (8)

Label	Occurrences
Precambrian	34
Precambrian Supereon canonical	10
Precambrian Eon	3
Precambrian geology	1
Precambrian or early Cambrian	1
Precambrian stratigraphy	1
Precambrian time	1
Precambrian time scale	1

How this entity was disambiguated

This entity first appeared as the object of triple T335895 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.

NED1 Entity disambiguation (via context triple) gpt-5-mini-2025-08-07

Target entity: Precambrian Supereon
Context triple: [Proterozoic Eon, partOf, Precambrian Supereon]

A. Proterozoic Eon
The Proterozoic Eon is a major division of Precambrian time, spanning from about 2.5 billion to 541 million years ago, marked by the buildup of atmospheric oxygen, the emergence of complex single-celled and early multicellular life, and the assembly of large continental landmasses.
B. Paleozoic Era
The Paleozoic Era was an ancient geologic time interval, spanning roughly 541 to 252 million years ago, marked by the emergence and diversification of complex life in the seas and on land and the assembly of major continental landmasses.
C. Phanerozoic Eon
The Phanerozoic Eon is the current and most recent major division of Earth's history, marked by abundant fossil evidence and the evolution and diversification of complex life forms, including plants, animals, and eventually humans.
D. Early Devonian
The Early Devonian was the initial subdivision of the Devonian Period, marked by the diversification of early fishes and the spread of primitive vascular land plants across emerging terrestrial ecosystems.
E. Jurassic Period
The Jurassic Period was a major division of the Mesozoic Era characterized by warm climates, the dominance and diversification of dinosaurs, and the early evolution of birds.
F. None of above. chosen
G. Unsure - the case is ambiguous/there is not enough information to decide.

NED2 Entity disambiguation (via description) gpt-5-mini-2025-08-07

Target entity: Precambrian Supereon
Target entity description: The Precambrian Supereon is the vast span of Earth's early history before the Phanerozoic, encompassing the Hadean, Archean, and Proterozoic eons during which the planet formed, life first appeared, and early continents and atmospheres developed.

A. Proterozoic Eon
The Proterozoic Eon is a major division of Precambrian time, spanning from about 2.5 billion to 541 million years ago, marked by the buildup of atmospheric oxygen, the emergence of complex single-celled and early multicellular life, and the assembly of large continental landmasses.
B. Paleozoic Era
The Paleozoic Era was an ancient geologic time interval, spanning roughly 541 to 252 million years ago, marked by the emergence and diversification of complex life in the seas and on land and the assembly of major continental landmasses.
C. Phanerozoic Eon
The Phanerozoic Eon is the current and most recent major division of Earth's history, marked by abundant fossil evidence and the evolution and diversification of complex life forms, including plants, animals, and eventually humans.
D. Early Devonian
The Early Devonian was the initial subdivision of the Devonian Period, marked by the diversification of early fishes and the spread of primitive vascular land plants across emerging terrestrial ecosystems.
E. Jurassic Period
The Jurassic Period was a major division of the Mesozoic Era characterized by warm climates, the dominance and diversification of dinosaurs, and the early evolution of birds.
F. None of above. chosen

Statements (49)

Predicate	Object
instanceOf	geological time interval ⓘ supereon ⓘ
alsoKnownAs	Cryptozoic ⓘ Precambrian ⓘ linked to: Precambrian Supereon
boundaryDefinedBy	base of Cambrian Period at 541 Ma ⓘ
characterizedBy	Great Oxidation Event ⓘ appearance of eukaryotes ⓘ appearance of multicellular organisms ⓘ dominance of microbial life ⓘ lack of abundant shelly fossils ⓘ major crustal differentiation ⓘ oxygenation of atmosphere ⓘ scarce fossil record ⓘ stabilization of continental cratons ⓘ
contains	Cryogenian Period ⓘ linked to: Neoproterozoic Era Ediacaran Period ⓘ linked to: Neoproterozoic Era Eoarchean Era ⓘ Hadean time interval ⓘ Mesoarchean Era ⓘ Mesoproterozoic Era ⓘ Neoarchean Era ⓘ linked to: Archean Eon Neoproterozoic Era ⓘ Paleoarchean Era ⓘ Paleoproterozoic Era ⓘ
covers	development of early atmosphere ⓘ development of early oceans ⓘ early Earth history ⓘ evolution of early life ⓘ formation of Earth ⓘ formation of first continents ⓘ origin of life ⓘ
duration	about 4 billion years ⓘ
endTime	about 541 million years ago ⓘ
followedBy	Paleozoic Era (within Phanerozoic) ⓘ linked to: Paleozoic Era
follows	none (represents earliest Earth history) ⓘ
geologicTimeRank	supereon (largest formal division) ⓘ
includes	Archean Eon ⓘ Hadean Eon ⓘ Proterozoic Eon ⓘ
includesEvent	Snowball Earth glaciations ⓘ emergence of Ediacaran biota ⓘ formation of banded iron formations ⓘ formation of first stable continental crust ⓘ
location	Earth ⓘ
partOf	geologic time scale ⓘ
precededBy	no earlier formal eon ⓘ
precedes	Phanerozoic Eon ⓘ
significance	covers about 88 percent of Earth history ⓘ
startTime	about 4.6 billion years ago ⓘ

How these facts were elicited