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Precambrean Time 4,600
EVENT 10 The presence of stromatolities indicates that shallow seas covered much of Earth during intervals in this period. EVENT 11 Nearly half of the valuable mineral deposits in the world occur in the rocks of this period. -
Period: to
S Orjuela P7
Geological Timescale -
Cambrian Period 542
EVENT 1 There is very little plant life during this period. EVENT 23 Shelled brachiopods appear -
Ordovician Period 488
EVENT 22 Trilobites appear EVENT 30 Colonies of tiny invertebrates call graptolites florished and vertebrates appear, Fish did not have jaws or teeth and their bodies were covered with bony plates. -
Silurian Period 444
EVENT 24 Eurypterids (sea scorpions), sea stars and coral become more common. EVENT 33 Vascular land plants and animals, such as scorpions begin to evolve in land. -
Devonian Period 416
EVENT 31 Huge plants begin to develop, early amphibians form. EVENT 37 Age of fishes, fish that can breath out of the water and spend time on land form. -
Mississippian Period 359
EVENT 2 Swamps and forest cover the land EVENT 21 Early reptiles resembling large lizards appear. -
Pennsylvanian Period 318
EVENT 4 Giant cockroaches appear. EVENT 15 Coal deposits form. -
Permian Period 299
EVENT 8 Appalachian Mountains are created because of the collision of tectonic plates & savannahs form. EVENT 38 Environmental change causes mass extinction of sea invertibrates (trilobites & eurypterids) as the seas retreat. -
Triassic Period 251
EVENT 16 Welcome to the world of the Dinosaur! Enter the squirrel sized dinosaur & the first forest dwelling mammals appear. EVENT 34 Ichthyosaurs are living in the ocean, new invertebrates call ammonite develop. -
Jurassic Period 200
EVENT 3 Flying reptiles called pterosaurs are in the air now. EVENT 13 Whoa those dinos are getting big & dominate the land - Lizard hipped and bird-hipped appear - carnivores and herbivores have arrived. -
Cretaceous Period 146
EVENT 5 First flowering plants appear - angiosperms. EVENT 35 Impact hypothesis - dinosaur mass extinction. -
Paleocene Epoch 65.5
EVENT 12 First primates evolve. EVENT 25 World wide temperatures drop about 4 degrees celsius (39.2 degrees fahrenheit) -
Eocene Epoch 55.8
EVENT 17 Flying squirrels, whales and bats appear. EVENT 29 Small rodents evolve. -
Oligocene Epoch 33.9
EVENT 6 Himalayas develop due to uplifting caused by the Indian subcontinent and Eurasian continents colliding. EVENT 27 Many early mammal become extinct, clams and snails flourish. -
Miocene Epoch 23.0
EVENT 32 Antartic icecaps begin to form. EVENT 36 Mediterranian Sea dries up and refills several times due to tectonic forcesa dn dropping sea levels. -
Pliocene Epoch 5.3
EVENT 18 Various species migrated between continents across land bridges. EVENT 26 First modern horses appear. -
Pleistocene Epoch 1.8
EVENT 19 The last glacial period ended and sea levels rose, Great Lakes formed. EVENT 20 Species that did not evolve to survive extreme cold moved to warmer climate areas or become extinct (dire wolf & giant ground sloth) -
Holocene Epoch 0.0115
EVENT 9 Homosapien (modern human) appeared & are hunters.EVENT 28 Modern human developed agriculture and used tools made of bronze and iron. -
Anthropocene Epoch
EVENT 7 Some scientists believe that human kind has caused mass extinctions of plant and animal species, polluted the oceans and altered the atmosphere. EVENT 14 There is argument as to when this epoch began, some scientist think it began with the industrial age in the early 1800´s other think it began with the atomic age in the 1950´s.
