The period featuring the Tyrannosaurus rex and Triceratops, ending with a mass extinction event. Classification and Anatomy Dinosaur Facts | American Museum of Natural History
Often considered the golden age, seeing the rise of giant sauropods and famous predators like Allosaurus . dinosaurs
The earliest dinosaurs appeared, evolving from ancestors that survived the Permian Extinction. The period featuring the Tyrannosaurus rex and Triceratops,
were a diverse group of reptiles that dominated terrestrial ecosystems for approximately during the Mesozoic Era . While most became extinct around 66 million years ago, their legacy continues through modern birds, which are their direct descendants. Geological Timeline their legacy continues through modern birds