Linea del tiempo By clases2021 Period: 4600 BCE to 540 BCE Precambrian Geologycal event: Climate event: 3800 BCE First unicellular form Period: 540 BCE to 255 BCE Paleozoic Geoloycal event: Climate event: Period: 255 BCE to 65 BCE Mesozoic Geologycal event: Climate event: Period: 65 BCE to 1 BCE Cenozoic Geologycal event: Climate event:
