Orosirian Period

E226915

The Orosirian Period is a division of early Earth's history marked by significant crustal stabilization, widespread orogeny, and major impact events roughly 2.05 to 1.8 billion years ago.

All labels observed (1)

Label Occurrences
Orosirian Period canonical 3

How this entity was disambiguated

Statements (40)

Predicate Object
instanceOf Paleoproterozoic period
geologic period
associatedWith large impact structures on Earth
orogenic belts on early Earth
belongsToChronoUnit Paleoproterozoic time interval
characterizedBy crustal stabilization
development of stable continental platforms
large-scale mountain building
major impact events
stabilization of continental cratons
widespread orogeny
chronologicalOrderInProterozoic second era-level subdivision of Proterozoic when counting from oldest to youngest
chronostratigraphicUnit system
definedBy absolute radiometric ages
endTime 1.8 billion years ago
1800 million years ago
environmentalContext oxygenated but still evolving atmosphere
stabilizing climate compared to Archean
followedBy Statherian Period
follows Rhyacian Period
geologicAge Paleoproterozoic
geologicSignificance important for early Proterozoic tectonics
major phase of continental assembly
hasStratigraphicRank period
linkedTo global tectonic reorganization
growth of continental crust
stabilization of Archean cratons
namedAfter Orosirian (from Greek oros meaning mountain)
partOf Paleoproterozoic Era
Precambrian Supereon
Proterozoic Eon
early Proterozoic
positionInPaleoproterozoic third period
precededBy Siderian Period
startTime 2.05 billion years ago
2050 million years ago
temporalRelation after Great Oxidation Event
before Mesoproterozoic Era
timeSpan approximately 250 million years
usedIn international geologic timescale

How these facts were elicited

Referenced by (3)

Full triples — surface form annotated when it differs from this entity's canonical label.

Paleoproterozoic Era containsSubdivision Orosirian Period
Statherian Period follows Orosirian Period
Rhyacian Period followedBy Orosirian Period