It was early Mesozoic era
The Mesozoic Era lasted approximately 250 million years ago to about 67 million years ago .
roughly 250 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)
Paleozoic and Mesozoic eras about 250 million years ago
Permian Period was from 299 million years ago to 250 million years ago
Trilobites became extinct about 250 million years ago, in the Mesozoic Era.
Mouse-like mammals date back to the Mesozoic Era, 250 million years ago to about 65 million years ago, before the destruction of the dinosaurs.
No. The Precambrian Era extended from 4.5 billion years ago to 542 million years ago. The Mesozoic Era lasted from 251 million years ago to 65 million years ago. The Paleozoic Era came in between the two.
The Paleozoic Era was about 2.5 times longer than the Mesozoic Era. The Paleozoic Era lasted from about 541 million years ago to 252 million years ago, while the Mesozoic Era lasted from about 252 million years ago to 66 million years ago.
Precambrian
Most of our limestone formed during the Paleozoic era, approximately 500 to 250 million years ago. Coal formation occurred mainly during the Carboniferous period within the Paleozoic era, around 360 to 300 million years ago.
The Paleozoic Era