Cambrian explosion
E74002
The Cambrian explosion was a relatively brief period around 541 million years ago when most major animal groups rapidly appeared in the fossil record, dramatically increasing the complexity and diversity of life on Earth.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Cambrian explosion canonical | 10 |
| Cambrian Explosion | 3 |
| The Emergence of Animals: The Cambrian Breakthrough | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T593705 — 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: Cambrian explosion Context triple: [Evolving Planet, hasSection, Cambrian explosion]
-
A.
Ediacaran biota
The Ediacaran biota comprises some of the earliest known complex multicellular organisms, featuring soft-bodied, enigmatic life forms that lived in the oceans before the Cambrian explosion.
-
B.
Permian–Triassic mass extinction
The Permian–Triassic mass extinction was the most severe biodiversity crisis in Earth's history, wiping out the majority of marine and terrestrial species around 252 million years ago and marking the boundary between the Paleozoic and Mesozoic eras.
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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.
Neoproterozoic Era
The Neoproterozoic Era was the final era of the Proterozoic Eon, marked by global “Snowball Earth” glaciations and the emergence of early multicellular life leading up to the Cambrian explosion.
-
E.
Cretaceous–Paleogene boundary
The Cretaceous–Paleogene boundary marks the geological transition 66 million years ago associated with a mass extinction event that wiped out non-avian dinosaurs and many other species, likely triggered by a large asteroid impact.
- 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: Cambrian explosion Target entity description: The Cambrian explosion was a relatively brief period around 541 million years ago when most major animal groups rapidly appeared in the fossil record, dramatically increasing the complexity and diversity of life on Earth.
-
A.
Ediacaran biota
The Ediacaran biota comprises some of the earliest known complex multicellular organisms, featuring soft-bodied, enigmatic life forms that lived in the oceans before the Cambrian explosion.
-
B.
Permian–Triassic mass extinction
The Permian–Triassic mass extinction was the most severe biodiversity crisis in Earth's history, wiping out the majority of marine and terrestrial species around 252 million years ago and marking the boundary between the Paleozoic and Mesozoic eras.
-
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.
Neoproterozoic Era
The Neoproterozoic Era was the final era of the Proterozoic Eon, marked by global “Snowball Earth” glaciations and the emergence of early multicellular life leading up to the Cambrian explosion.
-
E.
Cretaceous–Paleogene boundary
The Cretaceous–Paleogene boundary marks the geological transition 66 million years ago associated with a mass extinction event that wiped out non-avian dinosaurs and many other species, likely triggered by a large asteroid impact.
- F. None of above. chosen
Statements (52)
| Predicate | Object |
|---|---|
| instanceOf |
biological radiation
ⓘ
event in Earth history ⓘ evolutionary event ⓘ paleontological phenomenon ⓘ |
| endTime | approximately 530 million years ago ⓘ |
| followedBy | continued diversification in the Ordovician radiation ⓘ |
| follows |
Ediacaran biota
ⓘ
Ediacaran Period ⓘ
surface form:
Ediacaran period
|
| hasCause |
breakup of supercontinents and habitat diversification
ⓘ
changes in ocean chemistry ⓘ ecological feedbacks such as predator–prey arms races ⓘ evolution of Hox genes ⓘ evolution of developmental gene networks ⓘ post-glacial environmental changes after Neoproterozoic glaciations ⓘ rise in atmospheric oxygen levels ⓘ |
| hasEffect |
appearance of most major animal phyla in the fossil record
ⓘ
bioturbation of seafloor sediments ⓘ evolution of burrowing behaviors ⓘ evolution of defensive adaptations ⓘ expansion of marine ecosystems ⓘ increase in biodiversity ⓘ increase in ecological complexity ⓘ increase in morphological complexity ⓘ increase in predation ⓘ origin of complex food webs ⓘ proliferation of hard-bodied organisms ⓘ rapid diversification of animal life ⓘ widespread biomineralization ⓘ |
| hasEvidence |
Burgess Shale fossil lagerstätte
ⓘ
Cambrian biota ⓘ
surface form:
Chengjiang biota
Sirius Passet fauna ⓘ small shelly fossils ⓘ trace fossils indicating complex behavior ⓘ |
| involves |
annelids
ⓘ
arthropods ⓘ early chordates ⓘ echinoderms ⓘ molluscs ⓘ various extinct animal phyla ⓘ |
| locatedInTime |
Paleozoic Era
ⓘ
surface form:
Paleozoic era
Phanerozoic Eon ⓘ
surface form:
Phanerozoic eon
|
| occursIn | marine environments ⓘ |
| partOf |
Cambrian Period
ⓘ
surface form:
Cambrian period
|
| precededBy |
Ediacaran biota
ⓘ
surface form:
Ediacaran soft-bodied communities
long Precambrian history of life ⓘ |
| significance |
defines the base of the Cambrian period in the geologic time scale
ⓘ
marks the first appearance of complex animal-dominated ecosystems ⓘ |
| startTime | approximately 541 million years ago ⓘ |
| studiedIn |
evolutionary biology
ⓘ
geology ⓘ paleontology ⓘ stratigraphy ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Cambrian explosion Description of subject: The Cambrian explosion was a relatively brief period around 541 million years ago when most major animal groups rapidly appeared in the fossil record, dramatically increasing the complexity and diversity of life on Earth.
Referenced by (14)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Cambrian Explosion
this entity surface form:
The Emergence of Animals: The Cambrian Breakthrough
this entity surface form:
Cambrian Explosion
this entity surface form:
Cambrian Explosion