Barremian

Barremian
~129.4 – ~125.0 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Barremian sedimentary rock layers, France
Chronology
−140 — – −130 — – −120 — – −110 — – −100 — – −90 — – −80 — – −70 — – M e s o z o i c C Z J C r e t a c e o u s P g L J E a r l y L a t e P C Tithonian Berriasian Valanginian Hauterivian Barremian Aptian Albian Cenoman. Turonian Coniacian Santonian Campanian Maastricht. Danian       ← K-Pg mass extinction Subdivision of the Cretaceous according to the ICS, as of 2022.[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)	, Piobbico, Central Apennines, Italy

The Barremian is an age in the geologic timescale (or a chronostratigraphic stage) between 129.4 ± 1.5 Ma (million years ago) and 125.0 ± 1.0 Ma). 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.^[2]

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 stage, which is sometimes used in western European stratigraphy. In North America, the late and the early correspond to the Barremian. In New Zealand, it falls within the , and in Japan it corresponds to the late .^[2]

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
• zone of
• zone of Hemihoplites feraudianus
• zone of Gerhardtia sertousi
• zone of Ancyloceras vandenheckii
• zone of
• zone of
• zone of
• zone of Nicklesia nicklesi
• zone of Spitidiscus hugii

References[]

Notes[]

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