डाइनोसर इसके अंग्रेजी अर्थ का उदाहरण

Judging from their physical characteristics, this deformation likely represents the trampling and churning of these sands by dinosaurs after their deposition.

During the Campanian age, a radiation among dinosaur species occurred.

In North America, for example, the number of known dinosaur genera rises from 4 at the base of the Campanian to 48 in the upper part.

The generally warm climates and large continental area covered in shallow sea during the Campanian probably favoured the dinosaurs.

In the following Maastrichtian stage, the number of North American dinosaur genera found is 30% less than in the upper Campanian.

Varrichio observes that during the late Campanian Alberta and Montana had very similar theropods despite significant differences in the types of herbivorous dinosaur faunas.

Late Cretaceous oviraptorosaur (Theropoda) dinosaurs from Montana.

The earliest dinosaurs, such as Herrerasaurus and Eoraptor originated during the Carnian, around 230 Ma.

The oldest well documented dinosaurian assemblage, in the Ischigualasto Formation of Argentina, is most probably late Carnian in age.

The first dinosaurs (and the pterosaur Carniadactylus) also appeared in this stage, and though at the time they were small and insignificant, they diversified rapidly and would dominate the fauna for the rest of the Mesozoic.

On the other hand, the therapsids, which included the ancestors of mammals, decreased in both size and diversity, and would remain relatively small until the extinction of the dinosaurs.

Avemetatarsalians (non-dinosaurian) .

The Ischigualasto Formation of the Ischigualasto-Villa Unión Basin in northwestern Argentina yielded a very important vertebrate association, including the oldest dinosaurian assemblage.