| Priabonian | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 37.71 – 33.9Ma | |||||||||||||
| Chronology | |||||||||||||
| |||||||||||||
| Etymology | |||||||||||||
| Name formality | Formal | ||||||||||||
| Usage information | |||||||||||||
| Celestial body | Earth | ||||||||||||
| Regional usage | Global (ICS) | ||||||||||||
| Time scale(s) used | ICS Time Scale | ||||||||||||
| Definition | |||||||||||||
| Chronological unit | Age | ||||||||||||
| Stratigraphic unit | Stage | ||||||||||||
| Time span formality | Formal | ||||||||||||
| Lower boundary definition | LAD of the large acarininids and theForaminiferanMorozovelloides crassatus | ||||||||||||
| Lower boundary GSSP | Alano section,Piave river,Venetian Prealps,Belluno, Italy 45°54′51″N11°55′05″E / 45.9141°N 11.9180°E /45.9141; 11.9180 | ||||||||||||
| Lower GSSP ratified | February 2020[3] | ||||||||||||
| Upper boundary definition | LAD ofPlanktonic ForaminifersHantkenina andCribrohantkenina | ||||||||||||
| Upper boundary GSSP | Massignano quarry section,Massignano,Ancona,Italy 43°31′58″N13°36′04″E / 43.5328°N 13.6011°E /43.5328; 13.6011 | ||||||||||||
| Upper GSSP ratified | 1992[4] | ||||||||||||
ThePriabonian is, in theICS'sgeologic timescale, the latestage or the upperstage of theEoceneEpoch orSeries. It spans the time between37.71 and33.9 Ma. The Priabonian is preceded by theBartonian and is followed by theRupelian, the lowest stage of theOligocene.[5]
Priabona, an extinctdipteran ofPipunculidae family, is named after Priabonian, the age of deposits from which this insect is known.[6]
The Priabonian Stage was introduced in scientific literature byErnest Munier-Chalmas andAlbert de Lapparent in 1893. The stage is named after the small hamlet ofPriabona in the community ofMonte di Malo, in theVeneto region of northernItaly.[3]
The base of the Priabonian Stage is at thefirst appearance ofcalcareous nannoplankton speciesChiasmolithus oamaruensis (which forms the base of nanoplanktonbiozone NP18). An officialGSSP was ratified in 2020, and was placed in the Alano di Piave section inAlano di Piave,Belluno,Italy.[3]
The top of the Priabonian Stage (the base of the Rupelian Stage and Oligocene Series) is at theextinction offoramgenusHantkenina.[7]
Sometimes localrock strata cannot be correlated in sufficient detail with the ICS timescale, and stratigraphers often use regional timescales as alternatives to the ICS timescale. The Priabonian overlaps for example the upper Johannian and lowers Aldingan stages of theAustralian timescale or the upper Nanzian and lower Refugian stages of theCalifornian timescale. Other regional stages which are more or less coeval with the Priabonian include the Jacksonian of the southeastern US and Runangan ofNew Zealand.
Inbiostratigraphy, the Priabonian Stage is coeval with theChadronianNorth American Land Mammal Age, theHeadonianEuropean Land Mammal Mega Zone (in more detail: with theMammal Paleogene zones 17A through 20[8]), parts of the Barrancan andMustersanSouth American Land Mammal Ages and theUlangochuian andErgilianAsian Land Mammal Ages.
