Life History Event Timeline

Grand parents 50th anniversary picture day.

America was attacked marking the beginning of hunting down Osama .

Wheel is developed along with writing.

Domestication and agriculture is developed.

Homo erectus move out of Africa.

Forests turn into grasslands. First upright hominins appear.

Earth begins to cool, leaving permanent ice sheets in Antarctica.

Rhinoceros, camels and early horses appear.

A massive asteroid collides into the Earth at the present day Gulf of Mexico.  The  disastrous results of the collision (earthquakes, tsunamis, etc.) proceeded to kill 80-90% of marine species and 85% of land species, including all the dinosaurs. 

Triassic Period ends.  Jurassic Period begins.  There is no more polar ice and the Earth is warm.  Carnivorous and herbivorous dinosaurs dominate the land.  Flying reptiles appear. 

Permian period ends.  Mesozoic era begins.  Triassic period begins.  Break up of super continent Pangea begins.  First small dinosaurs appear. Meteor impact in Canada 100km crater.

Carboniferous period ends.  Permian period begins.  Super continent Pangea forms.  Sail backed synapsids appear. End of karoo ice age.

Vertebrates with legs first appear. First amphibians appear. Mass extinction of 70% of marine species.

Silurian Period ends. Devonian Period begins. First seed bearing plants appear. First forests begin to form. Wingless insects appear on land.

The Ordovician Period ends.  The Silurian Period begins.  First coral reefs appear.  Fish develop jaws (e.g. sharks).  Insects (spiders, centipedes, etc.) become present on land. 

Cambrian Period ends.  Ordovician Period begins.  First vertebrates appear in the ocean.  First plants and fungi appear on land.  Diversities of marine invertebrates become more common.  Carbon dioxide concentration in the atmosphere drops.

  The Cambrian Period begins. An abundance of multicellular organisms appears, along with most of the major groups of animals.  Animals with shells also appear.

Snowball Earth begins due to low concentrations of greenhouse gases like carbon dioxide and methane.  Without greenhouse warming, global temperatures began to drop lower while glacial ice began to form.  The sheets of ice then also reflected solar heat due to their white coloring, thus decreasing the amount of heat within Earth's atmosphere and lowering the temperature even more.  The Earth was then completely covered in glacial ice.

The supercontinent Rodinia breaks apart and forms the supercontinent Pannotia.

First multicellular organisms appear.

Oxygen-producing cyano-bacteria called stromatolites appear.

Planetoid collides with Earth.  Detached chunk of Earth formed the Moon.