Rhyacian Period
E226914
The Rhyacian Period is a geologic time interval in the early Proterozoic characterized by significant crustal growth, widespread metamorphism, and some of the earliest known large-scale glaciations.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Rhyacian Period canonical | 2 |
| older than Stenian Period | 1 |
| younger than Calymmian Period | 1 |
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
chronostratigraphic unit
ⓘ
geologic period ⓘ |
| associatedWith |
development of stable continental platforms
ⓘ
early Proterozoic oxygenation trend ⓘ growth of Archean cratonic nuclei ⓘ |
| biologicalSignificance |
early evolution of prokaryotic life
ⓘ
possible diversification of cyanobacteria ⓘ |
| characterizedBy |
early large-scale glaciations
ⓘ
orogenic activity ⓘ significant continental crustal growth ⓘ stabilization of cratons ⓘ widespread metamorphism ⓘ |
| chronologicalRank | period ⓘ |
| correspondingChronostratigraphicUnit | Rhyacian System ⓘ |
| definedBy | absolute radiometric ages rather than a specific GSSP ⓘ |
| duration | approximately 250 million years ⓘ |
| end | 2050 million years ago ⓘ |
| endUncertainty | ±10 million years ⓘ |
| environmentalConditions |
increasing atmospheric oxygen compared to Archean
ⓘ
widespread glacial climates at low latitudes ⓘ |
| era | Paleoproterozoic Era ⓘ |
| followedBy | Orosirian Period ⓘ |
| followedByEvent | intensified Orosirian orogenies ⓘ |
| follows | Siderian Period ⓘ |
| geologicEon | Proterozoic Eon ⓘ |
| globalExtent | worldwide ⓘ |
| hasMajorEvent |
Huronian glaciation
ⓘ
Huronian glaciation ⓘ
surface form:
Makganyene glaciation
global-scale ice ages ⓘ |
| lithologicalRecord |
glacial diamictites
ⓘ
metamorphosed sedimentary and volcanic sequences ⓘ paleosols reflecting changing atmosphere ⓘ |
| namedAfter | Greek word "rhyax" meaning "stream" or "flow" ⓘ |
| partOf | Paleoproterozoic Era ⓘ |
| positionInTimeScale | second period of the Paleoproterozoic ⓘ |
| precededByEvent | Siderian banded iron formation deposition peak ⓘ |
| recognizedBy |
geochronologists
ⓘ
stratigraphers ⓘ |
| standardAbbreviation | Rh ⓘ |
| start | 2300 million years ago ⓘ |
| startUncertainty | ±20 million years ⓘ |
| tectonicActivity |
assembly and reworking of early Proterozoic crust
ⓘ
formation of large continental landmasses ⓘ |
| timeScale | Proterozoic Eon ⓘ |
| timeScaleType | geochronologic unit ⓘ |
| usedIn |
International Chronostratigraphic Chart
ⓘ
surface form:
International Commission on Stratigraphy time scale
|
Referenced by (4)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
older than Stenian Period
this entity surface form:
younger than Calymmian Period