Chattian

Short description: Second Age of the Oligocene Epoch

Chattian

27.82 – 23.03 Ma

PreЄ

Chronology

Paleogene graphical timeline

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block; ">L

90%">Maastricht.

Danian

Selandian

Thanetian

Ypresian

Lutetian

Bartonian

Priabonian

Rupelian

Chattian

90%">Aquitanian

PETM

First Antarctic permanent ice-sheets[1]

K-Pg mass
extinction

Subdivision of the Paleogene according to the ICS, as of 2021.[2]
Vertical axis scale: millions of years ago

Formerly part of| Tertiary Period/System
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 Planktonic Foraminifer Chiloguembelina (Base of Foram Zone P21b)
Lower boundary GSSP| Monte Cagnero, Central Apennines, Italy
[ ⚑ ] 43°38′48″N 13°28′04″E﻿ / ﻿43.6466°N 13.4677°E﻿ / 43.6466; 13.4677
GSSP ratified| September 2016[3]
Upper boundary definition|

* Base of magnetic polarity chronozone C6Cn.2n.
* FAD of the Planktonic Foraminiferan Paragloborotalia kugleri

Upper boundary GSSP| Lemme-Carrosio Section, Carrosio, Italy
[ ⚑ ] 44°39′32″N 8°50′11″E﻿ / ﻿44.6589°N 8.8364°E﻿ / 44.6589; 8.8364
GSSP ratified| 1996[4]

The Chattian is, in the geologic timescale, the younger of two ages or upper of two stages of the Oligocene Epoch/Series. It spans the time between 28.1 and 23.03 Ma. The Chattian is preceded by the Rupelian and is followed by the Aquitanian (the lowest stage of the Miocene).[5]

## Contents

* 1 Stratigraphic definition
* 2 Volcanic event
* 3 References
* 3.1 Literature
* 4 External links

## Stratigraphic definition

The Chattian was introduced by Austrian palaeontologist Theodor Fuchs in 1894.[6] Fuchs named the stage after the Chatti, a Germanic tribe.[7] The original type locality was near the Germany city of Kassel.

The base of the Chattian is at the extinction of the foram genus 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 System) is at the first appearance of foram species Paragloborotalia kugleri, the extinction of calcareous nanoplankton species Reticulofenestra bisecta (which forms the base of nanoplankton biozone NN1), and the base of magnetic 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 30 through 26 and part of 25[8]); the upper Geringian and lower Arikareean mammal zones of North America; most of the Deseadan mammal zone of South America; the upper Hsandgolian and whole Tabenbulakian mammal zone of Asia; the upper Kiscellian and lower Egerian Paratethys 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; 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 occurred: the Fish Canyon eruption of La Garita with a magnitude of 9.2 and VEI of 8.[9] It has been dated to 27.51 Ma ago.[10]

## References

1. ↑ Zachos, J. C.; Kump, L. R. (2005). "Carbon cycle feedbacks and the initiation of Antarctic glaciation in the earliest Oligocene". Global and Planetary Change 47 (1): 51–66. doi:10.1016/j.gloplacha.2005.01.001. Bibcode: 2005GPC....47...51Z.
2. ↑ "International Chronostratigraphic Chart". International Commission on Stratigraphy. https://stratigraphy.org/icschart/ChronostratChart2020-01.pdf.
3. ↑ Coccioni, Rodolfo; Montanari, Alessandro; Nice, David; Brinkhuis, Henk; Deino, Alain; Frontalini, Fabrizio; Liter, Fabrizio; Maiorano, Patricia et al. (1 March 2018). "The Global Stratotype Section and Point (GSSP) for the base of the Chattian stage (Paleogene System, Oligocene Series) at Monte Cagnero, Italy". Episodes 41 (1): 17–32. doi:10.18814/epiiugs/2018/v41i1/018003.
4. ↑ Steininger, Fritz F.; M. P. Aubry; W. A. Berggren; M. Biolzi; A. M. Borsetti; Julie E. Cartlidge; F. Cati; R. Corfield et al. (1997). "The Global Stratotype Section and Point (GSSP) for the base of the Neogene". Episodes 20 (1): 23–28. doi:10.18814/epiiugs/1997/v20i1/005. http://www.stratigraphy.org/GSSP/file9.pdf.
5. ↑ "International Commission on Stratigraphy 2017". http://www.stratigraphy.org/index.php/ics-chart-timescale.
6. ↑ Harland, Brian et al. A Geological Time Scale 1989, Cambridge University Press, 1982. pp 64. ISBN 0-521-38361-7
7. ↑ Berry, Edward W. "The Mayence Basin, a Chapter of Geologic History", The Scientific Monthly, Vol. 16, No. 2, February 1923. pp. 114. Retrieved March 18, 2020.
8. ↑ Alroy, John. "Mammal Paleogene zones". p. The Paleobiology Database. http://paleodb.org/cgi-bin/bridge.pl?action=processViewScale&scale_no=125.
9. ↑ Mason et al. (2004)
10. ↑ Lanphere & Baadsgaard (2001)

### Literature

* Fuchs, T.; 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. Script error: The function "in_lang" does not exist.
* Gradstein, F.M.; Ogg, J.G. & Smith, A.G.; 2004: A Geologic Time Scale 2004, Cambridge University Press .
* Lanphere, M.A. & Baadsgaard, H.; 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.
* Mason, B.G.; Pyle, D.M. & Oppenheimer, C.; 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.

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kya = thousands years ago. Mya = millions years ago. Gya = billions years ago.
See also: Geologic time scale

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