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Precambrian time 1
Nearly half of the valuable mineral deposits in the world occur in the rocks of this period -
Precambrian time 2
The presence of the stormatolites indicates that shallow seas covered much of Earth during intervals in this period. -
Period: to
IBARGESp1
geological timescale -
Cambrian 1
Trilobites appear -
Cambrian 2
Shelled brachiopods appear. -
Ordovician 1
Colonies of tiny invertebrates call grapolites florished and vertibrates appear, Fish did not have jaws or teeth and their bodies were covered with bony plates. -
Ordovician 2
There is very little plant life during this period. -
Silurian 1
Eurypterids (sea scorpions), sea stars and coral became more common. -
silurian 2
Vascular land plants and animals, such as scorpians begin to evolve on land -
Devonian 1
Age of Fishes, fish that can breath out of the water and spend time out of the water. -
Devonian 2
Huge plants begin to develope, early amphibians form -
Mississippian 1
Swamps and forests cover the land -
Mississippian 2
Coal deposits form -
Carboninferous
Giant cockroaches appear -
Carboniferous
Early rptiles resembling large lizards appear -
Permian 1
Appalachian Mountains ar create because of the collision of tectonic plates & savannahs form -
Permian 2
Environmental change causes mass of extinction of sea invertebrates (trilobites & eurypterids) as the seas retreat -
Triassic 1
Welcome to the world of the Dinosaurs! Enter the squirrel size dinosaur & the first forest dwelling mammals appear -
Triassic 2
Ichthyosaurs are living in the ocean, new invertebrates call ammonite dvelope -
Jurrasic 1
Whoa those dinos are getting big & dominate the land - Lizard hipped and bird-hipped appear - carnivores and herbivores have arrived -
Jurrasic 2
Flying reptiles called pterosaurs are in the air now -
Cretacious 2
Impact hypothesis - dinosaurs mass extinction -
Cretacious 1
First flowering plants appear - angiosperm -
Paleocene 1
small rodents evolve -
Paleocene 2
First primates evolve -
Eocene epoch 1
Flying squirrels, whales and bats appear -
Eocene epoch 2
World wide temperatures drop about 4 degrees Celsius (39.2 degrees fahrenheit) -
Oligocene 1
Himalayas develop due to uplifting caused by the Indian subcontinent and Eurasian continents colliding -
Oligocene 2
Many early mammal become extinct, clams and snails flourish -
Miocene 1
Mediterranean Sea dries up and refills several times due to tectonic forces dn dropping sea levels -
Miocene 2
Antarctic icecaps begin to form -
Pliocene 1
first modern horses appear -
Pliocene 2
Various species migrated between continents across land bridges -
Pleistocene 2
Homosapien (modern humans) appeared & are hunters -
Pliestocene 1
Species that did not evolve to survive extreme cold moved to warmer climate areas or became extinct (dire wolf & giant ground sloth) -
Holocene 1
The last glacial period ended and sea levels rose, Great Lakes formed -
Holocene 2
Modern human developed agriculture and used tools made of bronze and iron. -
Anthropocene 1
There is a great argument as to when this epoch began, some scientists think it began with the industrial age in the early 1800's other than think it began with the atomic age, in the 1950's -
anthropocene 2
