This article will be permanently flagged as inappropriate and made unaccessible to everyone. Are you certain this article is inappropriate? Excessive Violence Sexual Content Political / Social
Email Address:
Article Id: WHEBN0000633144 Reproduction Date:
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.[1]
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 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.[1]
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.
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:
Much knowledge about the Barremian fauna—especially regarding birds, mammals and pterosaurs—derived from the famous Yixian Formation of China, part of which dates from this stage.
Maioteuthis
Neololigosepia
Oxyteuthis
Curtohibolites
Neohibolites
Eucymatoceras
Palelialia
Pseudaturoidea
Jinzhousaurus
Ponerosteus
Fukuisaurus
Hypsilophodon
Jeholosaurus
Cedrorestes
Valdosaurus
Dakotadon
Dollodon
Iguanodon
Osmakasaurus
Siluosaurus
Hongshanosaurus
Psittacosaurus
Stenopelix
Liaoceratops
Cedarosaurus
Aragosaurus
Amargasaurus
Histriasaurus
Eucamerotus
Oplosaurus
Amargatitanis
Fukuiraptor
Concavenator
Longipteryx
"Proornis"
Neovenator
Caudipteryx
Huaxiagnathus
Changchengornis
Microraptor
Sinornithosaurus
Utahraptor
Concornis
Iberomesornis
Harpymimus
Yixianosaurus
Afrovenator
Sapeornis
Shenzhousaurus
Pelecanimimus
Incisivosaurus
Baryonyx
Chilantaisaurus
Calamosaurus
Prodeinodon
Yaverlandia
Sinovenator
Falcarius
Liaoningosaurus
Gastonia
Hoplitosaurus
Polacanthus
Sauroplites
Craterosaurus
Regnosaurus
Eobaatar
Eomaia
Repenomamus
Jurassic, Paleogene, Neogene, Cenozoic, Devonian
United States, Canada, Mexico, Caribbean, Asia
Cretaceous, Neogene, Devonian, Permian, Triassic
Period (geology), Paleogene, Cretaceous, Jurassic, Neogene
Germany, China, Canada, Miocene, Bavaria
Barremian, Period (geology), Paleogene, Neogene, Valanginian
Albian, Paleogene, Period (geology), Cretaceous, Barremian
United States, China, Canada, Argentina, United Kingdom
Paleogene, Period (geology), Cretaceous, Neogene, Jurassic