Final answer:
The Late Jurassic is called the golden age of dinosaurs, a time when these creatures dominated terrestrial ecosystems after the mass extinction at the end of the Triassic Period.
Step-by-step explanation:
The Late Jurassic has been called the golden age of dinosaurs. The Jurassic Period, which occurred after the mass extinction that ended the Triassic Period, allowed dinosaurs to flourish tremendously. During this time, dinosaurs radiated to fill most terrestrial niches, and it was when the earliest birds evolved from their reptilian ancestors.
The Jurassic Period is known as the middle period of the Mesozoic Era, which itself is also referred to as the Age of Reptiles. The golden age of dinosaurs represents an evolutionary zenith during which these magnificent creatures dominated the Earth's terrestrial ecosystems. Their dominance continued until the Cretaceous Period, which concluded with another mass extinction, leading to the disappearance of most dinosaur species.