(65 million years ago -present)
(250 million years ago -65)
(541 million years ago -250)
(541 million years ago - Present)
(2.5 billion - 541 million years ago)
(4.6 - 4 billion years ago)
PHANEROZOIC
Realizado por selenia bermúdez suárez
Timeline the Geologic Timescale
HADEAN-ARCHEAN:
PROTEROZOIC
CAENOZOIC
PALAELOZOIC
MESOZOIC
The first ICE AGE occurred.
Appearance of primates.
PALAEOGENE
Nummulites are the most typical fossils.
Atmosphere rich in nitrogen, carbon dioxide and water vapour, formed by the activity of volcanoes.
Winged insects and reptiles appeared.
CARBONIFEROUS
Abundance of ferns and gymnosperms.
A MASS EXTINCTIONS which wiped out 75% of existing species (including the majority of dinosaurs), occurred.
The first snakes developed from lizards.
CRETACEOUS
Flowering plants, known as angiosperms, appeared.
Appearance of eukaryotic cells.
DEVONIAN
Animals began to colonise land, starting with insects and amphibians.
At the end of this era, the continents collided again, producing another supercontinent, Pangaea.
The water vapour condensed and precipitated forming the hydrosphere.
TRIASSIC
Dinosaurs appeared and dominated land ecosystems.
Hominids evolved to become the current species Homo sapiens.
QUATERNARY
The fauna and flora were very similar to today´s varieties.
The first hominids appeared.
NEOGENE
Mammals became the dominant group in land ecosystems.
The first multicellular heterotrophic organisms evolved (invertebrates such as worms, coelenterates and arthropods)
Appearance of prokaryotic cells (bacteria).
Appearance of autotrophic cells (cyanobacteria)
CAMBRIAN
The invertebrates continued to develop and animals with two shells as brachiopods proliferated.
Ammonites (type of molluscs) are the most typical fossils
The first mammals appeared.
JURASSIC
Diversification of large reptiles such as dinosaurs, ichthyosaurs and pterosaurs.
Solidification of the Earth´s crust.
The first land plants appeared (FERNS)
The first fish with jaws appeared.
SILURIAN
Development of molluscs like nautiluses and arthropods like trilobites.
PERMIAN
The greatest MASS EXTINCTIONS occurred, wiping out more than 90% of existing especies
Pangaea broke up and divided into two large continents: Gondwana to the south and Laurasia to the north.
The continents moved towards their current positions
One of the five historic MASS EXTINCTIONS occurred at the end of this period.
ORDOVICIAN
The first vertebrates appeared: jawless fish known as ostracoderms.