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System Series Stage Age (Ma)
Paleogene Paleocene Danian younger
Cretaceous Upper Maastrichtian 65.5–70.6
Campanian 70.6–83.5
Santonian 83.5–85.8
Coniacian 85.8–89.3
Turonian 89.3–93.5
Cenomanian 93.5–99.6
Lower Albian 99.6–112.0
Aptian 112.0–125.0
Barremian 125.0–130.0
Hauterivian 130.0–136.4
Valanginian 136.4–140.2
Berriasian 140.2–145.5
Jurassic Upper Tithonian older
Subdivision of the Cretaceous system according to the IUGS, as of July 2009.

In the geologic timescale, the Berriasian is an age or stage of the Early or Lower Creteceous. It is the oldest or lowest subdivision in the entire Cretaceous. It spanned between 145.5 ± 4.0 Ma and 140.2 ± 3.0 Ma (million years ago). The Berriasian succeeds the Tithonian (part of the Jurassic) and precedes the Valanginian.[1]

Contents

Stratigraphic definitions

The Berriasian stage was introduced in scientific literature by Henri Coquand in 1869. It is named after the village of Berrias in the Ardèche region of France. The English Wealden Group is of Berriasian age and in the past the name Wealden was also used to address rocks of the lowest Cretaceous.

The base of the Berriasian (also the base of the Cretaceous system) is at the first appearance of fossils of ammonite species Berriasella jacobi. A global reference profile (a GSSP) for the Berriasian had in 2009 not yet been established. A section in Austria has been proposed for ratification.

The top of the Berriasian stage (the base of the Valanginian) is at the first appearance of calpionellid species Calpionellites darderi in the stratigraphic column. This is just a little below the first appearance of ammonite species Thurmanniceras pertransiens.

In the Tethys domain, the Berriasian contains four ammonite biozones, from top to bottom:

  • Thurmanniceras otopeta
  • Subthurmannia boissieri
  • Subthurmannia occitanica
  • Berriasella jacobi

Palaeontology

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Birds

Birds of the Berriasian
Taxa Presence Location Description Images

Crocodylomorphs

Crocodylomorphs of the Berriasian
Taxa Presence Location Description Images

Mammalia

Mammals of the Berriasian
Taxa Presence Location Description Images
Durlston Bay, Dorset, England
Durlston Bay, Dorset, England; Spain
Portugal
Durlston Bay, Dorset, England
Portugal

Ornithischians

Ornithischians of the Berriasian
Taxa Presence Location Description Images
Swanage, England A bipedal herbivore, it was around 0.6 meters (2 ft) long. Unlike most ornithischians, Echinodon had one or two caniniform teeth in each maxilla.
Kirkwood Formation, Cape Province, South Africa A 4 meters long, 1.8 meters high stegosaurid with a skull similar to Kentrosaurus
Isle of Wight, England; Niger, Africa A dryosaurid

Pterosaurs

Pterosaurs of the Berriasian
Taxa Presence Location Description Images

Sauropods

Sauropods of the Berriasian
Taxa Presence Location Description Images

Thalattosuchia

Thalattosuchians of the Berriasian
Taxa Presence Location Description Images
From Kimmeridgian to Valanginian Austria, England, Germany, Portugal and Switzerland
Attested since Toarcian England, France, Germany, Switzerland and Morocco

Theropods (non-avian)

Non-avian theropods of the Berriasian
Taxa Presence Location Description Images

References

Notes

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

Literature

External links

Cretaceous period
Lower/Early Cretaceous Upper/Late Cretaceous
Berriasian | Valanginian | Hauterivian
Barremian | Aptian | Albian
Cenomanian | Turonian | Coniacian
Santonian | Campanian | Maastrichtian

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