World Library  
Flag as Inappropriate
Email this Article
 

Valanginian

System/
Period
Series/
Epoch
Stage/
Age
Age (Ma)
Paleogene Paleocene Danian younger
Cretaceous Upper/
Late
Maastrichtian 66.0–72.1
Campanian 72.1–83.6
Santonian 83.6–86.3
Coniacian 86.3–89.8
Turonian 89.8–93.9
Cenomanian 93.9–100.5
Lower/
Early
Albian 100.5–~113.0
Aptian ~113.0–~125.0
Barremian ~125.0–~129.4
Hauterivian ~129.4–~132.9
Valanginian ~132.9–~139.8
Berriasian ~139.8–~145.0
Jurassic Upper/
Late
Tithonian older
Subdivision of the Cretaceous system
according to the IUGS, as of July 2012.

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 132.9 ± 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.[1]

Contents

  • Stratigraphic definitions 1
    • Subdivision 1.1
  • Palaeontology 2
    • †Ankylosaurs 2.1
    • Birds (avian theropods) 2.2
    • Crocodylomorphs 2.3
    • †Ornithopods 2.4
    • †Pterosaurs 2.5
    • †Sauropods 2.6
    • †Stegosaurs 2.7
    • †Theropods (non-avian) 2.8
  • References 3
    • Notes 3.1
    • Literature 3.2
  • External links 4

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.

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:

Palaeontology

†Ankylosaurs

Ankylosauria of the Valanginian
Taxa Presence Location Description Images

Birds (avian theropods)

Birds of the Valanginian
Taxa Presence Location Description Images
France

Crocodylomorphs

Crocodylomorphs of the Valanginian
Taxa Presence Location Description Images

†Ornithopods

Ornithopoda of the Valanginian
Taxa Presence Location Description Images
Australia May be a chimera based on multiple species of ornithopods.
Europe First dinosaur ever found
Cape Province, South Africa Generally considered nomen dubium, it classified as a genus similar to Dryosaurus, i.e. an iguanodont.
Lanzhou, Gansu, China Notable for its "astonishingly huge teeth", among the largest for any herbivorous creature ever, which indicate it is an iguanodont. The mandible, longer than one meter, suggests very large size for the animal.
Isle of Wight, England; Niger, Africa A dryosaurid

†Pterosaurs

Pterosaurs of the Valanginian
Taxa Presence Location Description Images
Lonchodectes (left)
Lagarcito Formation, San Luis Province, Argentina; Chile

†Sauropods

Sauropods of the Valanginian
Taxa Presence Location Description Images

†Stegosaurs

Stegosaurs of the Valanginian
Taxa Presence Location Description Images

†Theropods (non-avian)

Non-Avian Theropods of the Valanginian
Taxa Presence Location Description Images

References

Notes

  1. ^ See Gradstein et al. (2004) for a detailed geologic timescale
  2. ^ a b c d e f g h Dating uncertain.
  3. ^ a b Only known from this stage.

Literature

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
This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and USA.gov, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for USA.gov and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
 
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
 
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.
 


Copyright © World Library Foundation. All rights reserved. eBooks from Project Gutenberg are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.