It was early Mesozoic era
It was in between about 590 and 248 million years ago and it lasted about 342 million years.
The Paleozoic era began about 543 million years ago. It came after the Precambrian era and before the Mesozoic era.
Began 5 billion years ago
The Cenozoic era started 65 million years ago.
The Cenozoic Era. This began 65.5 million years ago.
The modern era that began approximately 65 million years ago with the mass extinction of the dinosaurs is called the Cenozoic Era.
The era that started 4.6 billion years ago is known as the Hadean era. It began with the formation of the Earth and ended around 4 billion years ago. This era was characterized by intense heat and frequent bombardment by asteroids.
The Common Era is a period coinciding with the Christian era, which began 2,011 years ago. So we have been in that era for 2,011 years.
It began about 600,000 years ago, when the ancestors of Neanderthals began to evolve into Neanderthals.
We are living in the Cenozoic Era which began more than 60 million years ago.
The Mesozoic era began roughly 250 million years ago, and ended 65 million years ago. (This Era ended because of the K.T. extinction)
The Paleozoic Era lasted from 541 million years ago to 252 million years ago. During this era, life diversified rapidly, with the emergence of early fish, insects, plants, and reptiles. The end of the Paleozoic Era was marked by a mass extinction event that wiped out about 95% of marine species.