Period: 4500 BCE to 541 BCE
PRECAMBRIAN·Guide fossil: Stromatolites (cyanobacteria)
·Geological event: The layers of the earth begin to form
·Climate event: Glaciations begin to form
4:10 → 1st life formsFirst microscopic life forms (unicellular and prokaryotic) Later cyanobacteria are incorporated.
Period: 541 BCE to 252 BCE
PALEOZOIC·Guide fossil: Trilobites (arthropods)
·Geological event: Intense volcanism
·Climate event: Oxidizing atmosphere
·Mostly marine environment
9:07 →1st most complex life formsMulticellular algae and the first invertebrates develop, ediacaric organisms also appear.
21:10 → Great explosion of lifeAn explosion of life arises in which fish develop, the land begins to be colonize by plants and animals, the first amphibians, reptiles and forests appear.
21:37 → Age of fishThe Age of Fish, the development of first fish and later jawed fish.
21:48 → First terrestrial plants (gymnosperms)The colonization of the land begins, first by vegetables, years later fern and coniferous forests erupt.
22:13 → Amphibian ageThe Age of Amphibians, first records of amphibians, this is where the colonization of land by vertebrates begins.
Period: 252 BCE to 66 BCE
MESOZOIC·Guide fossil: Ammonites (cephalopods)
·Geological event: Pangea fractures
·Climate event: There are no glaciations
·Sea level drops and creatures on land dominate
22:43 → Age of the reptilesThe first reptiles to appear were the marine reptiles, including lizards. Then large reptiles like dinosaurs dominated, most of the fossils of this era are theirs.
23:22 → 1st angiospermsGreat diversification of plants, especially angiosperms, with flowers and fruits such as eucalyptus.
Period: 66 BCE to
CENOZOIC·Guide fossil: Nummutiles (marine foraminifera)
·Geological event: Continental drift ends
·Climate event: Last ice ages
·Mostly land environment
23:39 → Age of the birdsArcheopteryx was the first bird and for a long time it was the only known feathered animal of the Mesozoic. Later in the Cenozoic there was a diversification of these animals derived from dinosaurs.
23:53 → 1st hominidsWithin the Primates Order are located the hominids or great apes. In the Quaternary, the presence of this first hominids appears.
23:59 → 1st Homo sapiensThen the homosapiens appear, that is, first humans, these were poorly developed, but little by little they have become what we are today.