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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 [4] [5] colliding with Earth, ending the Cretaceous.
Sullivan argued that dinosaur biodiversity experienced a marked decline over the last ten million years of the Cretaceous Period. [94] Stromberg and others reported that fossil pollen from the Hell Creek Formation provided evidence for a gradual shift in the region's flora "from more open to more closed and moist habitats". [41] 1999
The Cretaceous (IPA: / k r ɪ ˈ t eɪ ʃ ə s / krih-TAY-shəss) [2] is a geological period that lasted from about 145 to 66 million years ago (Mya). It is the third and final period of the Mesozoic Era, as well as the longest.
The largest dinosaur known from Brazil Austroraptor: 2008 Allen Formation (Late Cretaceous, Campanian to Maastrichtian) Argentina: Possessed an elongated snout paralleling that of spinosaurids Baalsaurus: 2018 Portezuelo Formation (Late Cretaceous, Turonian to Coniacian) Argentina: Had a squared-off dentary with its teeth crowded to the front ...
Microceratus (meaning "small-horned") is a genus of small ceratopsian dinosaur that lived in the Cretaceous period in Asia.It walked on two legs, had short front arms, a characteristic ceratopsian frill and beak-like mouth, and was around 60 cm (2.0 ft) long. [1]
Upper Cretaceous: herbivore: Hadrosauromorph from Alabama with skull fragments discovered. In 2021, a more complete skeleton was unearthed. [1] Niobrarasaurus: Upper Cretaceous: herbivore: Another example of a nodosaurid dinosaur from Kansas. Ornithotarsus: Upper Cretaceous: herbivore: Junior synonym of Hadrosaurus. Parrosaurus: Upper ...
Dinosaurs of the Cretaceous Period, existing/appearing during the latter Mesozoic Era. Subcategories. This category has the following 11 subcategories, out of 11 ...
Laramidia was an island continent that existed during the Late Cretaceous period (99.6–66 Ma), when the Western Interior Seaway split the continent of North America in two. In the Mesozoic era, Laramidia was an island land mass separated from Appalachia to the east by the Western Interior Seaway. It was home to many dinosaurs including ...
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