Barremian

Short description: Fourth age and stage of the Early/Lower Cretaceous

Barremian

~125.77 – ~121.4 Ma

PreЄ

Barremian sedimentary rock layers, France

Chronology

Cretaceous graphical timeline

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Tithonian

Berriasian

Valanginian

Hauterivian

Barremian

Aptian

Albian

Cenoman.

Turonian

Coniacian

Santonian

Campanian

Maastricht.

90%;>Danian

K-Pg mass
extinction

Subdivision of the Cretaceous according to the ICS, as of 2021.[1]
Vertical axis scale: millions of years ago.

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| Not formally defined
Lower boundary definition candidates| FAD of the Spitidiscus hugii-Spitidiscus vandeckii Ammonite group
Lower boundary GSSP candidate section(s)| Río Argos, Caravaca de la Cruz, Murcia Province, Spain
Upper boundary definition| Not formally defined
Upper boundary definition candidates|

* Base of magnetic polarity chronozone M0r.
* Near FAD of the Ammonite Paradeshayesites oglanlensis

Upper boundary GSSP candidate section(s)| Gorgo a Cerbara, Piobbico, Central Apennines, Italy

The Barremian is an age in the geologic timescale (or a chronostratigraphic stage) between 125.77 Ma (million years ago) and 121.4 ± 1.0 Ma[2] (Historically, this stage was placed at 129.4 million to approximately 125 million years ago[3]) It is a subdivision of the Early Cretaceous Epoch (or Lower Cretaceous Series). It is preceded by the Hauterivian and followed by the Aptian Stage.[4]

## Contents

* 1 Stratigraphic definitions
* 1.1 Regional equivalents
* 1.2 Subdivision
* 2 References
* 2.1 Notes
* 2.2 Literature
* 3 External links

## Stratigraphic definitions

The original type locality for the Barremian Stage is in the vicinity of the village of Barrême, Alpes-de-Haute-Provence, France . Henri Coquand defined the stage and named it in 1873.

The base of the Barremian is determined by the first appearance of the ammonites Spitidiscus hugii and Spitidiscus vandeckii. The end of the Barremian is determined by the geomagnetic reversal at the start of the M0r chronozone, which is biologically near the first appearance of the ammonite Paradeshayesites oglanlensis.

### Regional equivalents

The Barremian falls in the Gallic epoch, a subdivision of the Cretaceous that is no longer used by the ICS. It overlaps the lower part of the Urgonian (pl) stage, which is sometimes used in western European stratigraphy. In North America, the late Coahulian and the early Comanchean correspond to the Barremian. In New Zealand, it falls within the Mokoiwian, and in Japan it corresponds to the late Aritan.[4]

### Subdivision

The Barremian is often subdivided into two substages or subages, Lower/Early and Upper/Late Barremian.

In the Tethys domain, the Barremian stage contains eleven ammonite biozones:

* zone of Pseudocrioceras waagenoides
* zone of Colchidites sarasini
* zone of Imerites giraudi
* zone of Hemihoplites feraudianus
* zone of Gerhardtia sertousi
* zone of Ancyloceras vandenheckii
* zone of Coronites darsi
* zone of Kotetishvilia compressissima
* zone of Nicklesia pulchella
* zone of Nicklesia nicklesi
* zone of Spitidiscus hugii

## References

### Notes

1. ↑ Super User. "ICS - Chart/Time Scale". http://www.stratigraphy.org/index.php/ics-chart-timescale.
2. ↑ Cohen, K.M., Finney, S.C., Gibbard, P.L. & Fan, J.-X. (2013; updated) The ICS International Chronostratigraphic Chart. Episodes 36: 199-204.
3. ↑ "ICS-Geological Timescale". March 2020. https://stratigraphy.org/ICSchart/ChronostratChart2020-03.pdf.
4. ↑ 4.0 4.1 See Gradstein et al. (2004) or the online geowhen database (link below)

### Literature

* Cossmann, M. & Pelat, E. (1907): Le Barrémien supérieur à faciès Urgonien de Brouzet-lès-Alais (Gard). Mémoires de la Société Géologique de France, Paléontologie 15(37): 5-42. (in French)
* Gradstein, F.M.; Ogg, J.G. & Smith, A.G.; (2004): A Geologic Time Scale 2004, Cambridge University Press .
* Guzhikov, A.Yu. & Baraboshkin, E.J. (2006): Assessment of diachronism of biostratigraphic boundaries by magnetochronological calibration of zonal scales for the Lower Cretaceous of the Tethyan and Boreal belts. Doklady Earth Sciences 409(6): 843-846. doi:10.1134/S1028334X06060018

## External links

* GeoWhen Database - Barremian
* Mid-Cretaceous timescale, at the website of the subcommission for stratigraphic information of the ICS
* Stratigraphic chart of the Lower Cretaceous, at the website of Norges Network of offshore records of geology and stratigraphy

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