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Valanginian
Valanginian
139.8 ± 3.0 – 132.6 ± 2.0 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Chronology
←	K-Pg mass; extinction
	Subdivision of the Cretaceous according to the ICS, as of 2023.; 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 Calpionellid Calpionellites darderi
Lower boundary GSSP candidate section(s)	Montbrun-les-Bains, Drôme, France; Cañada Luenga, Betic Cordillera, Spain;
Upper boundary definition	FAD of the Ammonite genus Acanthodiscus
Upper boundary GSSP	La Charce, Drôme, France; 44°28′10″N 5°26′37″E / 44.4694°N 5.4437°E
Upper GSSP ratified	December 2019

In the geologic timescale, the Valanginian is an age or stage of the Early or Lower Cretaceous. It spans between 139.8 ± 3.0 Ma and 132.6 ± 2.0 Ma (million years ago). The Valanginian Stage succeeds the Berriasian Stage of the Lower Cretaceous and precedes the Hauterivian Stage of the Lower Cretaceous.^[3]

Stratigraphic definitions

The Valanginian was first described and named by Édouard Desor in 1853. It is named after Valangin, a small town north of Neuchâtel in the Jura Mountains of Switzerland.

The base of the Valanginian is at the first appearance of calpionellid species Calpionellites darderi in the stratigraphic column. A global reference section (a GSSP) had in 2009 not yet been appointed.

The top of the Valanginian (the base of the Hauterivian) is at the first appearance of the ammonite genus Acanthodiscus.^{[citation needed]}

Subdivision

The Valanginian is often subdivided in Lower and Upper substages. The Upper substage begins at the first appearance of ammonite species Saynoceras verrucosum and the major marine transgression Va3.

In the Tethys domain, the Valanginian stage contains five ammonite biozones:

zone of Criosarasinella furcillata
zone of Neocomites peregrinus
zone of Saynoceras verrucosum
zone of Busnardoites campylotoxus
zone of Tirnovella pertransiens ^{[citation needed]}

Flora

The oldest fossils that can definitely be attributed to the clade Angiospermae (flowering plants) are dated to the Late Valanginian.^[4]

References

Notes

^ "International Chronostratigraphic Chart" (PDF). International Commission on Stratigraphy. September 2023. Retrieved December 16, 2024.
^ Mutterlose, Jörg; Rawson, Peter; Reboulet, Stéphane; Baudin, François; Bulot, Luc; Emmanuel, Laurent; Gardin, Silvia; Martinez, Mathieu; Renard, Maurice (September 2020). "The Global Boundary Stratotype Section and Point (GSSP) for the base of the Hauterivian Stage (Lower Cretaceous), La Charce, southeast France". Episodes. 44 (2): 129–150. doi:10.18814/epiiugs/2020/020072. Retrieved 24 December 2020.
^ See Gradstein et al. (2004) for a detailed geologic timescale
^ Coiro M, Doyle JA, Hilton J (July 2019). "How deep is the conflict between molecular and fossil evidence on the age of angiosperms?". The New Phytologist. 223 (1): 83–99. Bibcode:2019NewPh.223...83C. doi:10.1111/nph.15708. PMID 30681148.

Literature

Gradstein, F.M.; Ogg, J.G. & Smith, A.G.; (2004): A Geologic Time Scale 2004, Cambridge University Press.

External links

GeoWhen Database - Valanginian
Mid-Cretaceous timescale and ühttp://stratigraphy.science.purdue.edu/charts/Timeslices/5_JurCret.pdf Jurassic-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