Représentation du dinosaure Dinevenator robustus, récemment découvert. Ce troodontidé a été identifié en 2026 à partir d'un fossile collecté dans le comté de San Juan.
The distictive banding of the Morrison Formation, a group of rock layers that occur throughout Dinosaur National Monument. The formation originated as muds and sands laid down by ancient rivers, and some of its outcrops have been found to contain 150-million-year-old dinosaur fossils like those found at the monument's Dinosaur Quarry.
Bituminous claystone, Lower Jurassic, Hesselberg, Middle Franconia.
Sedimentary rock of very thin laminated layers (particles less than 0,0002 mm).
Rock formation is known for its rich fossil findings, ex. Ichthyosaur.
Nyasasaurus is a basal dinosauromorph that may be the earliest known dinosaur. It was a small bipedal animal at about 2-3 m in length. Nyasasaurus is difficult to classify due to inconclusive fossil evidence, but if it is a true dinosaur, it pushes the dinosaur lineage back about 12 million years to the Middle Triassic.
Sidersaura is a rebbachisaurid sauropod dinosaur from the Late Cretaceous of Argentina. Rebbachisaurids are the last known dipldocoids, and lived alongside the titanosaurs until fairly late in the Cretaceous before disappearing from the fossil record, presumably going extinct. They have long tails and relatively short necks, by sauropod standards. Sidersaura one of the most recent rebbachisaurids yet found, living in the Cenomanian–Turonian ages of the Late Cretaceous. It was large for a rebbachisaurid, growing to about 20 m in length.
Fossil of Mei long (holotype), on temporary display at the Shanghai Natural History Museum as part of the exhibition "China's Dinosaur World". Shot on July 22, 2025.
Known fossil pieces after Aviatyrannis jurassica (Dinosauria, Theropoda, Coelurosauria, Tyrannosauroidea).[1]
Sources
↑ Rauhut O.W.M. (2003), "A tyrannosaurid dinosaur from the Upper Jurassic of Portugal", Paleontology 46(5): p. 903-910.
Il y a un demi-milliard d’années, une étrange créature marine appelée Mollisonia symetrica aurait ouvert la voie aux araignées modernes. Grâce à une analyse détaillée du cerveau des fossiles, les chercheurs ont découvert des schémas neuronaux étonnamment similaires à ceux des arachnides d'aujourd'hui, ce qui suggère que les araignées ont évolué dans l'océan et non sur terre comme on le pensait auparavant. Cette structure cérébrale fait même allusion à un saut évolutif critique qui a permis aux araignées d’acquérir leur fameuse vitesse, leur dextérité et leurs prouesses à tisser des toiles. Les résultats constituent un défi de longue date
![Known fossil pieces after Aviatyrannis jurassica (Dinosauria, Theropoda, Coelurosauria, Tyrannosauroidea).[1]
Sources
↑ Rauhut O.W.M. (2003), "A tyrannosaurid dinosaur from the Upper Jurassic of Portugal", Paleontology 46(5): p. 903-910.](https://upload.wikimedia.org/wikipedia/commons/thumb/7/7d/Aviatyrannis_remains_01.png/330px-Aviatyrannis_remains_01.png?utm_source=en.wikipedia.org&utm_campaign=api&utm_content=thumbnail)
