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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
·Marine environment -
3800 BCE
4:10 → 1st life forms
First 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 -
540 BCE
9:07 →1st most complex life forms
Multicellular algae and the first invertebrates develop, ediacaric organisms also appear. -
485 BCE
21:10 → Great explosion of life
An 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. -
443 BCE
21:37 → Age of fish
The Age of Fish, the development of first fish and later jawed fish. -
443 BCE
21:48 → First terrestrial plants (gymnosperms)
The colonization of the land begins, first by vegetables, years later fern and coniferous forests erupt. -
419 BCE
22:13 → Amphibian age
The 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 -
251 BCE
22:43 → Age of the reptiles
The 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. -
201 BCE
23:22 → 1st angiosperms
Great 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 BCE
23:39 → Age of the birds
Archeopteryx 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. -
2 BCE
23:53 → 1st hominids
Within the Primates Order are located the hominids or great apes. In the Quaternary, the presence of this first hominids appears. -
2 BCE
23:59 → 1st Homo sapiens
Then the homosapiens appear, that is, first humans, these were poorly developed, but little by little they have become what we are today.