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Precambrian 1 Period
Nearly half of the valuable mineral deposits in the world occur in the rocks of this period -
Precambrian 2 period
The presence of stromatolites indicates that shallow seas covered much of Earth during intervals in this period -
Period: to
J Salas P1
Geological Time Scale -
Cambrian 1 period
Trilobites appear -
Cambrain 2 Period
Shelled brachiopods appear -
ordovician 2 Period
There is very little plant life during this period -
Ordovician 1 Period
Colonies of tiny invertebrates call graptolites florished and vertibrates appear, Fish did not have jaws or teeth and their bodies were covered with bony plates -
Silurian 1
Eurypterids (sea scorpions), Sea stars and coral become more common -
Silurian 2
Vascular land plants and animals, such as scorpions begin to evolve on land -
Devonian 2 Period
Huge plants begin to develop, early amphibians form -
Devonian 1 Period
Age of fishes, fish that can breath out of the water and spend time on land form -
Mississippian 2 Period
coal deposits form -
Mississippian 1 Period
Swamps and forests cover the land -
Pennsylvanian 1 period
Giant cockroaches appear -
Pennsylvanian 2 Period
Early reptiles resembling large lizards appear -
Permain 1 Period
Appalachain Mountains are created because of the collisions of tectonic plates and savannas form -
Permian 2 Period
Environmental change causes mass extinction of sea invertibrates (trilobites and eurypterids) as the seas retreat -
Triassic 2 Period
Ichthyosaurs are living in the ocean, new invertebrates call ammonite develop -
Triassic 1 Period
Welcome to the world of the dinosaur! Enter the squirrel sized dinosaur and the first forest dwelling mammals appear -
Jurassic 2 Period
Flying Reptiles called pterosaurs are in the air now -
Jurassic 1 Period
Whoa those dinos are getting big and dominate the land lizard hipped appear carnivores and herbivores have arrived -
Cretaceous 2 Period
impact hypothesis dinosaur ass extinction -
Cretaceous 1 Period
First flowering plant appear angiosperm -
Paleocene 1 Period
First primates evolve -
Paleocene 2 Period
small rodents evolve -
Eocene 2 Period
world wide temperatures drop about 4 degrees celsius (39.2 degrees fahrenheit) -
Eocene 1 Period
Flying squirrels, whales and bats appear -
Oligocene 1 Period
Himalayas develop due to uplifting caused mass extinctions of plant and animal species polluted the oceans and altered the atmosphere -
Oligocene 2 Period
Many early mammal become extinct, clams and snails flourish -
Miocene 1 Period
Mediterranean sea dries up and refills several times due to tectonic forcesa dn dropping sea levels -
Miocene 2 Period
Antarctic ice caps begin to form -
Pliocene 1 Period
First modern horses appear -
Pliocene 2 Period
Various species migrated between continents across land bridges -
Pleistocene 2 Period
Homosapien (modern humans) appeared and hunters -
Pleistocene 1 Period
species that did not evolve to survive extreme cold moved to warmer climate areas or became extinct (dire wolf and giant ground sloth -
Holocene 2 Period
Modern Humans developed agriculture and used tools made of bronze and iron -
Holocene 1 Period
The last glacial period ended and sea levels rose, Great lakes formed -
Anthropocene 2 Period
some scientist believe that human kind has caused mass extinction of plant and animal species, polluted the oceans and altered the atmosphere -
Anthropocene 1 Period
There is a argument as to when this epoch began, some scientist think it began with the industrial age early 1800s others think it began with the atomic age in the 1950s
