Asselian
E392439
The Asselian is the earliest age of the Permian Period, marking the beginning of the Cisuralian epoch in the geologic timescale.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Asselian canonical | 1 |
Statements (37)
| Predicate | Object |
|---|---|
| instanceOf |
chronostratigraphic stage
ⓘ
geologic age ⓘ |
| characterizedBy |
cool to temperate climatic conditions in many regions
ⓘ
early diversification of Permian marine faunas ⓘ |
| chronologicalRank | age ⓘ |
| chronostratigraphicRank | stage ⓘ |
| contains | Asselian regional biostratigraphic zones ⓘ |
| correlatesWith |
lower part of Autunian (European regional stage)
ⓘ
lower part of Wolfcampian (North American regional stage) ⓘ |
| earliestAgeOf | Permian Period ⓘ |
| end | approximately 293.52 million years ago ⓘ |
| endUncertainty | ±0.17 million years ⓘ |
| follows | Gzhelian ⓘ |
| globalStratotypeSectionAndPointLocation | Usolka section, southern Ural Mountains, Russia ⓘ |
| GSSPDefinedBy | first appearance datum of conodont Streptognathodus isolatus ⓘ |
| GSSPRatificationYear | 1996 ⓘ |
| GSSPRatifiedBy | International Commission on Stratigraphy ⓘ |
| introducedBy | V. E. Ruzhenchev NERFINISHED ⓘ |
| introducedInYear | 1950s ⓘ |
| lowerBoundaryDefinedBy | first appearance of Streptognathodus isolatus ⓘ |
| marksBeginningOf | Cisuralian Epoch ⓘ |
| namedAfter | Assel River ⓘ |
| nameLanguage | Russian ⓘ |
| overlies | Gzhelian stage of the Carboniferous ⓘ |
| partOf |
Cisuralian Epoch
ⓘ
Paleozoic Era ⓘ Permian Period ⓘ Phanerozoic Eon ⓘ |
| positionInPermian | first stage of Cisuralian series ⓘ |
| precedes | Sakmarian ⓘ |
| start | approximately 298.9 million years ago ⓘ |
| startUncertainty | ±0.15 million years ⓘ |
| timeScaleUsedIn | International Chronostratigraphic Chart ⓘ |
| underlies | Sakmarian stage of the Permian ⓘ |
| upperBoundaryDefinedBy |
first appearance of conodont Mesogondolella bisselli
ⓘ
first appearance of conodont Sweetognathus merrilli ⓘ |
| usedIn | global correlation of Permian sedimentary rocks ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.