Time line By rubiii cen Period: 4600 BCE to 540 BCE Precambrian Geological events: Climate events: 3800 BCE First unicellular form Period: 540 BCE to 250 BCE Paleozoic Geological events: Climate events: 500 BCE First complex live form(Invertebrate) 400 BCE Fish age Period: 255 BCE to 65 BCE Mesozoic Geological events: Climate events: 150 BCE Land plants (Gimnosperms) Period: 65 BCE to 1 BCE Cenozoic Geological events: Climate events:
