The Precambrian era took place around 4 billion 370 million 165 million 65 million( 4 billion, 370 million, 165 million, 65 million ) years ago. Significant events include the formation of the sun humans fish me( the sun, humans, fish, me ) and the large amount of volcanic eruptions dinosaurs ice ages continents( volcanic eruptions, dinosaurs, ice ages, continents ). The Paleozoic era took place around 4 billion 65 million 370 million 165 million( 4 billion, 65 million, 370 million, 165 million ) years ago. Significant events include the first humans dinosaurs continents fish( humans, dinosaurs, continents, fish ) and the formation of the sun humans shallow seas volcanic eruptions( the sun, humans, shallow seas, volcanic eruptions ). The Mesozoic era took place around 65 million 4 billion 165 million 370 million( 65 million, 4 billion, 165 million, 370 million ) years ago. Significant events include the first humans fish volcanoes dinosaurs( humans, fish, volcanoes, dinosaurs ) and the first ice age drifting of the continents first plants first fish( first ice age, drifting of the continents, first plants, first fish ). The Cenozoic era started 65 million 370 million 4 billion 165 million( 65 million, 370 million, 4 billion, 165 million ) years ago but encompasses the present. Significant events include the first humans fish ice plants( humans, fish, ice, plants ) and the ice ages dinosaur ages formation of water first seas( ice ages, dinosaur ages, formation of water, first seas ).