Línea del tiempo By laraguezz Period: 4600 BCE to 540 BCE Precambrian 4000 BCE 1st ocean (Panthalassa) 3600 BCE 1st forms of unicellular life 3500 BCE Estromatolitos (guide fosil) 2400 BCE First ice age 2100 BCE 1st most complex life forms (invertebrates) Period: 540 BCE to 250 BCE Paleozoic 522 BCE Trilobites (guide fosil) 438 BCE Fish age 435 BCE 1st land plants (gymnosperma) 360 BCE Amphibian age 335 BCE Emergence of the supercontinent (Pangea ||) 270 BCE Age of reptiles Period: 250 BCE to 65 BCE Mesozoic 245 BCE Dinosaurios (guide fosil) 200 BCE Age of birds and mammals 174 BCE 1st angiospern plants (with flowers) Period: 65 BCE to 1 BCE Cenozoic 64 BCE Numulites (guide fosil) 12 BCE Appearance of the first hominids 1 BCE Appearance of the first homosapiens
