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.[2]
Subdivision
The Barremian is often subdivided into two substages or subages, Lower/Early and Upper/Late Barremian.
^International Commission on Stratigraphy. "ICS - Chart/Time Scale". www.stratigraphy.org.
^ abSee Gradstein et al. (2004) or the online geowhen database (link below)
Literature
Cossmann, M. & Pelat, E. (1907): Le Barrémien supérieur à faciès Urgonien de Brouzet-lès-Alais (Gard). Mémoires de la Société Géologique de France, Paléontologie15(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 Sciences409(6): 843-846. doi:10.1134/S1028334X06060018
External links
Mid-Cretaceous timescale, at the website of the subcommission for stratigraphic information of the ICS
, at the website of Norges Network of offshore records of geology and stratigraphy
February 07, 2023
barremian, geologic, timescale, chronostratigraphic, stage, between, million, years, subdivision, early, cretaceous, epoch, lower, cretaceous, series, preceded, hauterivian, followed, aptian, stage, preꞒ, sedimentary, rock, layers, francechronology, mesozoiccz. The Barremian is an age in the geologic timescale or a chronostratigraphic stage between 129 4 1 5 Ma million years ago and 121 4 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 Barremian 129 4 121 4 Ma PreꞒ Ꞓ O S D C P T J K Pg NBarremian sedimentary rock layers FranceChronology 140 130 120 110 100 90 80 70 MesozoicCZJCretaceousPgLJEarlyLatePCTithonianBerriasianValanginianHauterivianBarremianAptianAlbianCenoman TuronianConiacianSantonianCampanianMaastricht Danian K Pg massextinctionSubdivision of the Cretaceous according to the ICS as of 2022 1 Vertical axis scale millions of years ago EtymologyName formalityFormalUsage informationCelestial bodyEarthRegional usageGlobal ICS Time scale s usedICS Time ScaleDefinitionChronological unitAgeStratigraphic unitStageTime span formalityFormalLower boundary definitionNot formally definedLower boundary definition candidatesFAD of the Spitidiscus hugii Spitidiscus vandeckii Ammonite groupLower boundary GSSP candidate section s Rio Argos Caravaca de la Cruz Murcia Province SpainUpper boundary definitionNot formally definedUpper boundary definition candidatesBase of magnetic polarity chronozone M0r Near FAD of the Ammonite Paradeshayesites oglanlensisUpper boundary GSSP candidate section s Gorgo a Cerbara Piobbico Central Apennines Italy Contents 1 Stratigraphic definitions 1 1 Regional equivalents 1 2 Subdivision 2 References 2 1 Notes 2 2 Literature 3 External linksStratigraphic definitions EditThe original type locality for the Barremian Stage is in the vicinity of the village of Barreme 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 Edit 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 2 Subdivision Edit 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 Colchidites sarasini zone of Imerites giraudi zone of Hemihoplites feraudianus zone of Gerhardtia sertousi zone of Ancyloceras vandenheckii zone of Coronites darsi zone of Kotetishvilia compressissima zone of Nicklesia pulchella zone of Nicklesia nicklesi zone of Spitidiscus hugiiReferences EditNotes Edit International Commission on Stratigraphy ICS Chart Time Scale www stratigraphy org a b See Gradstein et al 2004 or the online geowhen database link below Literature Edit Cossmann M amp Pelat E 1907 Le Barremien superieur a facies Urgonien de Brouzet les Alais Gard Memoires de la Societe Geologique de France Paleontologie 15 37 5 42 in French Gradstein F M Ogg J G amp Smith A G 2004 A Geologic Time Scale 2004 Cambridge University Press Guzhikov A Yu amp 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 S1028334X06060018External links EditGeoWhen 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 Retrieved from https en wikipedia org w index php title Barremian amp oldid 1082589835, wikipedia, wiki, book, books, library,