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

How this entity was disambiguated

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 ⓘ

How these facts were elicited

Referenced by (1)

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

Permian Period → containsStage → Asselian ⓘ