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www.thoughtco.com/the-three-ages-of-dinosaurs-1091932

This chart is a simple overview of the Triassic, Jurassic, and Cretaceous periods, all of which were part of the Mesozoic era. In brief, this incredibly long period of time, measured in "mya" or "millions of years ago," saw the development of dinosaurs, marine reptiles, fish, mammals, flying animals including pterosaurs and birds, and a huge range of plant life.

sciencing.com/three-time-periods-dinosaurs-lived-8737410.html

The Mesozoic era was a period of history that stretched from 248 to 65 million years ago. It is divided into the three time periods in which the dinosaurs lived: the Triassic, Jurassic and Cretaceous.

www.factmonster.com/dk/encyclopedia/science/era-dinosaurs

Dinosaurs roamed the planet for about 165 million years, during a time in the Earth’s history called the Mesozoic Era. It is difficult to imagine how long this was, until we compare it with ourselves: humans have lived on Earth for less than two million years. During the Mesozoic Era, the Earth ...

en.wikipedia.org/wiki/Dinosaur

Dinosaurs are a diverse group of reptiles of the clade Dinosauria. They first appeared during the Triassic period, between 243 and 233.23 million years ago, although the exact origin and timing of the evolution of dinosaurs is the subject of active research.

www.activewild.com/dinosaur-periods

Dinosaur Periods of the Mesozoic Era. Dinosaurs were alive in the Triassic, Jurassic and Cretaceous periods. Together, these three periods make up the Mesozoic Era. Due to the dominance of the dinosaurs and other reptiles during the Mesozoic Era, it has become known as the ‘Age of Reptiles’. Mesozoic Era (252.17 to 66 million years ago)

en.wikipedia.org/wiki/Mesozoic

The era began in the wake of the Permian–Triassic extinction event, the largest well-documented mass extinction in Earth's history, and ended with the Cretaceous–Paleogene extinction event, another mass extinction whose victims included the non-avian dinosaurs. The Mesozoic was a time of significant tectonic, climate and evolutionary activity.

www.livescience.com/38596-mesozoic-era.html

The Mesozoic Era is divided up into the Triassic, Jurassic, and Cretaceous periods. Life and climate. The Mesozoic Era began roughly around the time of the end-Permian extinction, which wiped out ...

www.quora.com/What-time-periods-did-dinosaurs-live-in

Thanks for the A2A. There are six named geological periods during which dinosaurs have existed. Fair warning, if this is a homework question, you’ll probably only get credit for the first three. 1. Triassic, 251–201 million years ago (mya). Dinosa...

www.activewild.com/types-of-dinosaurs

Want to see a list of dinosaurs rather than learning about types of dinosaur? Take a look at this page: List of Dinosaurs with Pictures and Information. Discover dinosaurs from specific periods of the Mesozoic Era on the following pages: Triassic Dinosaurs, Jurassic Dinosaurs, Cretaceous Dinosaurs.

www.nhm.ac.uk/discover/dino-directory/timeline/late-triassic/...

Dinosaurs in the late Triassic (237 to 201 million years ago) 16 dinosaurs from the Late Triassic. Chindesaurus Coelophysis Coloradisaurus Eoraptor Guaibasaurus Herrerasaurus Liliensternus Lycorhinus Melanorosaurus Mussaurus Plateosaurus Procompsognathus Pro-compsognathus