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Aptian

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Aptian

The Aptian is an age in the geologic timescale or a stage in the stratigraphic column. It is a subdivision of the Early or Lower Cretaceous epoch or series and encompasses the time from 125.0 ± 1.0 Ma to 113.0 ± 1.0 Ma (million years ago), approximately. The Aptian succeeds the Barremian and precedes the Albian, all part of the Lower/Early Cretaceous.

Contents

The Aptian partly overlaps the upper part of the regionally used (in Western Europe) stage Urgonian.

Stratigraphic definitions

The Aptian was named after the small city of Apt in the Provence region of France, which is also known for its crystallized fruits. The original type locality is in the vicinity of Apt. The Aptian was introduced in scientific literature by French palaeontologist Alcide d'Orbigny in 1840.

The base of the Aptian stage is laid at magnetic anomaly M0r. A global reference profile for the base (a GSSP) had in 2009 not yet been appointed. The top of the Aptian (the base of the Albian) is at the first appearance of coccolithophore species Praediscosphaera columnata in the stratigraphic record.

Subdivision

In the Tethys domain, the Aptian contains eight ammonite biozones:

  • zone of Hypacanthoplites jacobi
  • zone of Nolaniceras nolani
  • zone of Parahoplites melchioris
  • zone of Epicheloniceras subnodosocostatum
  • zone of Duffrenoyia furcata
  • zone of Deshayesites deshayesi
  • zone of Deshayesites weissi
  • zone of Deshayesites oglanlensis
  • Sometimes the Aptian is subdivided in three substages or subages: Bedoulian (early or lower), Gargasian (middle) and Clansayesian (late or upper).

    Lithostratigraphic units

    Antlers Formation, Cedar Mountain Formation, Cloverly Formation, Elrhaz Formation, Jiufotang Formation, Little Atherfield, Mazong Shan, Potomac Formation, Santana Formation, Twin Mountains Formation, Xinminbao Group, Yixian Formation

    †Ammonitida

  • Pictetia
  • Eogaudryceras
  • Georgioceras
  • Lithancylus
  • Salfeldiella
  • Zuercherella
  • Lower
  • Eotetragonites
  • Pseudosaynella
  • Roloboceras
  • Helicancylus
  • Procheloniceras
  • Prodeshayesites
  • Shastoceras
  • Ammonitoceras
  • Australiceras
  • Cheloniceras
  • Cicatrites
  • Colombiceras
  • Dufrenoya
  • Melchiorites
  • Parahoplites
  • Upper
  • Hypacanthoplites
  • Sinzovia
  • Trochleiceras
  • Mathoceratites
  • Metahamites
  • Neosilesites
  • Protanisoceras
  • Ammonoceratites
  • Beudanticeras
  • Gyaloceras
  • Hulenites
  • Knemiceras
  • Uhligella
  • Acanthohoplites
  • Acanthoplites
  • Argonauticeras
  • Burckhardites
  • Cloioceras
  • Diadochoceras
  • Diodochoceras
  • Eodouvilleiceras
  • Epancyloceras
  • Epicheloniceras
  • Gargasiceras
  • Jauberticeras
  • Kazanskyella
  • Mathoceras
  • Megatyloceras
  • Miyakoceras
  • Nodosohoplites
  • Nolaniceras
  • Protacanthoplites
  • Somalites
  • Theganoceras
  • Tropaeum
  • Gabbioceras
  • Tetragonites
  • Desmoceras
  • Hamites
  • †Belemnitida

  • Vectibelus
  • Conoteuthis
  • Lower
  • Tetrabelus
  • Peratobelus
  • Parahibolites
  • Nautilida

  • Heminautilus
  • Carinonautilus
  • †Orthocerida

  • Upper
  • Zhuralevia
  • †Phylloceratida

  • Upper
  • Euphylloceras
  • Sepiida

  • Upper
  • Adygeya
  • Naefia
  • Birds (avian theropods)

  • Boluochia zhengi
  • Chaoyangia beishanensis
  • Confuciusornis sanctus
  • Cuspirostrisornis houi
  • Jeholornis prima
  • Jixiangornis orientalis
  • Largirostrornis sexdentoris
  • Longchengornis sanyanensis
  • Longipteryx chaoyangensis
  • Sapeornis chaoyangensis
  • Sinornis santensis/Cathayornis yandica
  • Songlingornis linghensis
  • Yanornis martini
  • Yixianornis grabaui
  • Crocodylomorpha

  • Sarcosuchus
  • Fish

  • Hybodus
  • Jinanichthys longicephalus
  • Lycoptera davidi
  • Lycoptera muroii
  • Peipiaosteus pani
  • Protosephurus liui
  • Sinamia zdanskyi
  • †Pterosaurs

  • Anhanguera
  • Araripedactylus dehmi
  • Araripesaurus castilhoi
  • Arthurdactylus conandoylei
  • Boreopterus cuiae
  • Brasileodactylus araripensis
  • Cearadactylus atrox
  • Chaoyangopterus zhangi
  • Dsungaripterus weii
  • Dsungaripterus brancai
  • Eoazhdarcho liaoxiensis
  • Eopteranodon lii
  • Gegepterus changi
  • Haopterus gracilis
  • Hongshanopterus lacustris
  • Huaxiapterus benxiensis
  • Huaxiapterus corollatus
  • Huaxiapterus jii
  • Istiodactylus latidens
  • Istiodactylus sinensis
  • Jidapterus edentus
  • Liaoningopterus gui
  • Liaoxipterus brachyognathus
  • Lonchodectes
  • Longchengpterus zhaoi
  • Ludodactylus sibbicki
  • Nemicolopterus crypticus
  • Nurhachius ignaciobritoi
  • Ornithocheirus simus
  • Ornithocheirus mesembrinus
  • Pricesaurus megalodon
  • Santanadactylus
  • Sinopterus dongi
  • Sinopterus gui
  • Tapejara navigans
  • Tapejara wellnhoferi
  • Thalassodromeus sethi
  • Tropeognathus mesembrinus
  • Tropeognathus robustus
  • Tupandactylus imperator
  • References

    Aptian Wikipedia


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