@prefix qx8: . @prefix skos: . qx8: a skos:ConceptScheme . qx8:-MZ7G07KD-P skos:prefLabel "Sénonien"@fr, "Senonian"@en ; a skos:Concept ; skos:narrower qx8:-4WD3KZGZ-5 . qx8:-4WD3KZGZ-5 skos:definition "The Maastrichtian is, in the ICS geologic timescale, the latest age (uppermost stage) of the Late Cretaceous Epoch or Upper Cretaceous Series, the Cretaceous Period or System, and of the Mesozoic Era or Erathem. It spanned the interval from 72.1 to 66 million years ago. The Maastrichtian was preceded by the Campanian and succeeded by the Danian (part of the Paleogene and Paleocene). The Cretaceous–Paleogene extinction event (formerly known as the Cretaceous–Tertiary extinction event)[a] occurred at the end of this age. In this mass extinction, many commonly recognized groups such as non-avian dinosaurs, plesiosaurs and mosasaurs, as well as many other lesser-known groups, died out. The cause of the extinction is most commonly linked to an asteroid about 10 to 15 kilometres (6.2 to 9.3 mi) wide colliding with Earth, ending the Cretaceous. The Maastrichtian was introduced from the Chalk Group close to the Dutch city of Maastricht. During the Maastrichtian, the global climate began to shift from the warm and humid climate of the Mesozoic to the colder and more arid climate of the Cenozoic. Variation of climate with latitude also became greater. This was likely caused by a major reorganization of oceanic circulation that took place at the boundary between the early and late Maastrichtian. This reorganization was triggered by the breach of tectonic barriers in the South Atlantic, permitting deep ocean water to begin circulating from the nascent North Atlantic to the south. This initiated thermohaline circulation similar to that of the modern oceans. At the same time, the Laramide orogeny drained the Western Interior Seaway of North America, further contributing to global cooling. (Adapted from: https://en.wikipedia.org/wiki/Maastrichtian)"@en, "Le Maastrichtien (appelé Maestrichtien jusqu'en 1980) est le 12e et dernier étage stratigraphique du Crétacé, entre -72,1 ± 0,2 et -66,0 Ma. Il succède au Campanien et précède l'ère cénozoïque (Danien, premier étage du Paléogène). Le Maastrichtien a été défini à partir des tuffeaux de Maastricht, aux Pays-Bas. Le stratotype historique ne couvrant que la fin de l'étage (entre -68,2 et -65,5 Ma), la carrière de Tercis-les-Bains (Landes, France) constitue le stratotype de la limite Campanien-Maastrichtien. À la cote 115,2, la base de cet étage est définie par douze critères biostratigraphiques dont l'apparition de l'ammonite Pachydiscus neubergicus mais pas de la bélemnite Belemnella lanceolata qui est absente en Téthys. Son sommet correspond à l'événement connu sous le nom d'extinction du Crétacé (disparition entre autres, des ammonites et bélemnites). Il est souvent marqué par une couche d'argile noire enrichie en iridium. L'un des fossiles les plus connus du Maastrichtien est le mosasaure, ou reptile de la Meuse. (Adapté de : https://fr.wikipedia.org/wiki/Maastrichtien)"@fr ; skos:exactMatch , ; skos:inScheme qx8: ; a skos:Concept ; skos:prefLabel "Maastrichtian"@en, "Maastrichtien"@fr ; skos:altLabel "Maestrichtien"@fr ; skos:broader qx8:-MZ7G07KD-P .