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The Precambrian Period
Event 1 : Earth forms; continental shields appear. Event 2 : Nearly half of the valuable mineral deposits in the world occur in the rocks of this period. Event 3 : Himalayas develop due to uplifting caused by Indian subcontinent and Eurasian continents colliding. -
The Cambrian period
Event 1 : Colonies of tiny invertebrates call graptolites florished and vertibrates appear, Fish did not have haws or teeth and their bodies were covered with bony plates. Event 2 : Shelled marine invertebrates appear Event 3 : Trilobites decline. Event 4 : graptolites flourish. -
The Ordovician
Event 1 : Echinoderms appear. Event 2 : Brachiopods increase. Event 3 : Trilobites decline. Event 4 Graptolites flourish. Event 5 : Appalachian Mountains are created because of the collision of tectonic plates. -
The Silurian
Event 1 The presence of stromatolites indicates that shallow seas covered much of Earth during intervals in this period. Event 2 : Eurypterids, land plants and animals appear. Event 3 : The presence of stromatolites indicates that shallow seas covered much of earth during intervals in this period. Event 4 : There is very little plant life during this period. -
The Devonian
Event 1 : Age of fish begun. Event 2 : Amphibians appear. Event 3 : Giant horsetail, ferns, and seed-bearing plants develop. Event 4 : Age of fishes, fish that can breath out of the water and spend time on land form. -
The Mississippian period
Event 1 : Amphibians flourish. Event 2 : Brachiopods are n ocean. Event 3 : Forests and swamps cover most land -
The Pensylvanian
Event 1 : Coal deposits form. Event 2: Reptiles appear. Event 3 : Giant cockroaches and dragonflies are common. -
The Permian
Event 1 : Pangaea comes together. Event 2 : Mass extinctions mark the end of the Paleozoic Era. -
The Traiassic
Event 1 : Welcome to the world of the Dinosaur! Enter the squirrel sized dinosaur & the first forest dwelling mammals appear. Event 2 : Ammonites are common. Event 3 : Cycads and conifers are abundant mammals appear. -
The Jurassic
Event 1 : Flying reptiles called pterosaurs are in the air. Event 2 : Dinosaurs are the dominant life-form. Event 3 : Primative birds appear. -
The Cretaceous
Event 1 : First flowering plants appear. Event 2 : Modern birds and flowering plants appear. Event 3 : Mass extinctions mark the end of the Mesozoic Era. -
The Paleocene
Event 1 : Age of mammals begins first primates appear. -
The Eocene
Event 1 : Flying squirrels, bats, and whales appear. Event 2 : Worldwide temperatures drop about 4 degrees Celsius (39.2 Fahrenheit) -
The Oligocene
Event 1 : Pigs, deer, camels, cats, and dogs appear. -
The Pliocene
Event 1 : Large carnivores (bears, lions) appear. Event 2 : Various species migrated between continents across land bridges. -
The Miocene
Event 1 : Raccoons and wolves appear. Event 2 :Grazing hers are abundant. -
The Pleistocene
Event 1 : Woolly mammoths, rhinos, and humans appear. Event 2 : Species that didnot evolve to survive extreme cold moved to warmer climates areas or became extinct (direwolf and giant ground sloth). -
The Holocene
Event 1 : The last Glacial period ends. Event 2 : Modern human developed agriculture and used tools made of bronze and iron. Event 3 : Complex human societies develop. -
The Anthropocene
Event 1 : Some scientist believe that human kind has caused mass extinctions of plant and animal species, polluted the oceans and altered the atmosphere. Event 2 : There is an argument as to when this epoch began, some scientist think it began with the industrial age in the early 1800's others think it began with the atomic age in the 1950's.
