The Chattian is, in the

geologic timescale The geologic time scale, or geological time scale, (GTS) is a representation of time based on the rock record of Earth. It is a system of chronological dating that uses chronostratigraphy (the process of relating strata to time) and geochr ...

, the younger of two

ages Ages may refer to: *Advanced glycation end-products, known as AGEs *Ages, Kentucky, census-designated place, United States * ''Ages'' (album) by German electronic musician Edgar Froese *The geologic time scale, a system of chronological measuremen ...

or upper of two stages of the

Oligocene The Oligocene ( ) is a geologic epoch of the Paleogene Period and extends from about 33.9 million to 23 million years before the present ( to ). As with other older geologic periods, the rock beds that define the epoch are well identified but t ...

Epoch In chronology and periodization, an epoch or reference epoch is an instant in time chosen as the origin of a particular calendar era. The "epoch" serves as a reference point from which time is measured. The moment of epoch is usually decided ...

/ Series. It spans the time between . The Chattian is preceded by the

Rupelian The Rupelian is, in the geologic timescale, the older of two ages or the lower of two stages of the Oligocene Epoch/ Series. It spans the time between . It is preceded by the Priabonian Stage (part of the Eocene) and is followed by the Chattian ...

and is followed by the Aquitanian (the lowest stage of the

Miocene The Miocene ( ) is the first geological epoch of the Neogene Period and extends from about (Ma). The Miocene was named by Scottish geologist Charles Lyell; the name comes from the Greek words (', "less") and (', "new") and means "less recen ...

Stratigraphic definition

The Chattian was introduced by

Austria Austria, , bar, Östareich officially the Republic of Austria, is a country in the southern part of Central Europe, lying in the Eastern Alps. It is a federation of nine states, one of which is the capital, Vienna, the most populous ...

n palaeontologist Theodor Fuchs in 1894. Fuchs named the stage after the

Chatti The Chatti (also Chatthi or Catti) were an ancient Germanic tribe whose homeland was near the upper Weser (''Visurgis''). They lived in central and northern Hesse and southern Lower Saxony, along the upper reaches of that river and in the val ...

, a Germanic tribe.Berry, Edward W
"The Mayence Basin, a Chapter of Geologic History"
''

The Scientific Monthly ''The Scientific Monthly'' was a science magazine published from 1915 to 1957. Psychologist James McKeen Cattell, the former publisher and editor of ''The Popular Science Monthly'', was the original founder and editor. In 1958, ''The Scientific Mon ...

'', Vol. 16, No. 2, February 1923. pp. 114. Retrieved March 18, 2020. The original type locality was near the

German German(s) may refer to: * Germany (of or related to) **Germania (historical use) * Germans, citizens of Germany, people of German ancestry, or native speakers of the German language ** For citizens of Germany, see also German nationality law **Ge ...

city of

Kassel Kassel (; in Germany, spelled Cassel until 1926) is a city on the Fulda River in northern Hesse, Germany. It is the administrative seat of the Regierungsbezirk Kassel and the district of the same name and had 201,048 inhabitants in December 2020 ...

. The base of the Chattian is at the

extinction Extinction is the termination of a kind of organism or of a group of kinds (taxon), usually a species. The moment of extinction is generally considered to be the death of the Endling, last individual of the species, although the Functional ext ...

of the foram

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial nom ...

''Chiloguembelina'' (which is also the base of foram biozone P21b). An official GSSP for the Chattian Stage was ratified in October of 2016. The top of the Chattian Stage (which is the base of the Aquitanian Stage, Miocene Series and

Neogene The Neogene ( ), informally Upper Tertiary or Late Tertiary, is a geologic period and system that spans 20.45 million years from the end of the Paleogene Period million years ago ( Mya) to the beginning of the present Quaternary Period Mya. ...

System A system is a group of interacting or interrelated elements that act according to a set of rules to form a unified whole. A system, surrounded and influenced by its environment, is described by its boundaries, structure and purpose and express ...

) is at the first appearance of foram species ''Paragloborotalia kugleri'', the

of calcareous

nanoplankton Plankton are the diverse collection of organisms found in water (or air) that are unable to propel themselves against a current (or wind). The individual organisms constituting plankton are called plankters. In the ocean, they provide a cruc ...

species ''Reticulofenestra bisecta'' (which forms the base of nanoplankton biozone NN1), and the base of

magnetic Magnetism is the class of physical attributes that are mediated by a magnetic field, which refers to the capacity to induce attractive and repulsive phenomena in other entities. Electric currents and the magnetic moments of elementary particl ...

C6Cn.2n. The Chattian is coeval with regionally used stages or zones such as the upper Avernian European mammal zone (it spans the

Mammal Paleogene zones The Mammal Paleogene zones or MP zones are system of biostratigraphy, biostratigraphic biozone, zones in the stratigraphic record used to correlate mammal-bearing fossil localities of the Paleogene period of Europe. It consists of thirty consecutiv ...

30 through 26 and part of 25); the upper Geringian and lower Arikareean mammal zones of North America; most of the

Deseadan The Deseadan ( es, Deseadense) age is a period of geologic time (29.0–21.0 Ma) within the Oligocene epoch of the Paleogene to the Early Miocene epoch of the Neogene, used more specifically within the SALMA classification of South America. It fol ...

mammal zone of South America; the upper Hsandgolian and whole Tabenbulakian mammal zone of Asia; the upper Kiscellian and lower Egerian

Paratethys The Paratethys sea, Paratethys ocean, Paratethys realm or just Paratethys was a large shallow inland sea that stretched from the region north of the Alps over Central Europe to the Aral Sea in Central Asia. Paratethys was peculiar due to its p ...

stages of Central and eastern Europe; the upper Janjukian and lower Longfordian Australian regional stages; the Otaian, Waitakian, and Duntroonian stages of the

New Zealand geologic time scale While also using the international geologic time scale, many nations–especially those with isolated and therefore non-standard prehistories–use their own systems of dividing geologic time into epochs and faunal stages. In New Zealand, these ep ...

; and part of the Zemorrian Californian stage and Chickasawhayan regional stage of the eastern US.

Volcanic event

During the Chattian the largest known single-event

volcanic eruption Several types of volcanic eruptions—during which lava, tephra (ash, lapilli, volcanic bombs and volcanic blocks), and assorted gases are expelled from a volcanic vent or fissure—have been distinguished by volcanologists. These are oft ...

occurred: the Fish Canyon eruption of La Garita with a magnitude of 9.2 and VEI of 8.Mason ''et al.'' (2004) It has been dated to ago.Lanphere & Baadsgaard (2001)

References

Literature

* ; 1894: ''Tertiaerfossilien aus den kohlenführenden Miocaenablagerungen der Umgebung von Krapina und Radaboj und über die Stellung der sogenannten "Aquitanischen Stufe"'', Königlich- Ungarische Geologische Anstalt, Mittheilungen und Jahrbuch 10, p. 163-175. * ; 2004: ''A Geologic Time Scale 2004'',

Cambridge University Press Cambridge University Press is the university press of the University of Cambridge. Granted letters patent by King Henry VIII in 1534, it is the oldest university press in the world. It is also the King's Printer. Cambridge University Pr ...

. * ; 2001: ''Precise K–Ar, ⁴⁰Ar/³⁹Ar, Rb–Sr and U/Pb mineral ages from the 27.5 Ma Fish Canyon Tuff reference standard'', Chemical Geology 175(3–4), pp 653–671. * ; 2004: ''The size and frequency of the largest explosive eruptions on Earth'', Bulletin of Volcanology 66(8), pp 735–748.

External links

Stratigraphy.org: GeoWhen Database for Chattian Age

Purdue.edu: ICS subcommission for stratigraphic information − Neogene timescale (including the upper Paleogene)
— ''by subcommission of International Commission on Stratigraphy− ICS''.
NorgesNetwork.no: Stratigraphic chart of the Paleogene Period
— ''Norwegian records of offshore geology and stratigraphy''. {{Geological history, p, c, state=collapsed Oligocene geochronology Geological ages