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Precambrian Period
Event 10 The presence of stromatolites indicates that shallow seas covered much of Earth during intervals in this period. Event 8 Appalachian Mountains are created because of the collision of the tectonic plates & Savannah forms. -
Period: to
S. Blandon Period 4
Geological Timescale -
Cambrian Period
Event 22 Trilobrites appear. Event 23 Shelled brachiopods appear. -
Ordovician Period
Event 1 there is very little plant life during this period. Event 30 colonies of tiny invertebrates called graptolites florished and vertebrates appeared, fish did not have jaws or teeth and their bodies were covered with bony plates. -
Silurian Period
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 on land. -
Devonian Period
Event 31 Huge plants begin to develop, early amphibians. Event 37 Age of Fishes, fish that can breath out of the water and spend time on land form. -
Carboniferous Misssissippian Period
Event 11 Neraly half of the valuable mineral deposits in the world occur in the rocks in this time period. Event 21 Early reptiles resembling large lizards appear. -
Carboniferous Pennslyvanian Period
Event 4 Giant cockroaches appear. Event 15 Coal deposits form. -
Triassic Period
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
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
Event 2 Swamps and forests cover the land. Event 5 First flowering plants appear- angiosperm. -
Paleocene Epoch
Event 12 First primates evolve. Event 29 Small rodents evolve. -
Eocene Epoch
Event 17 Flying squirrels, whales and bats appear. Event 25 World wide temperatures drop about 4 degrees Celsius(39.2 degrees Fahrenheit). -
Oligocene Epoch
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
Event 32 Antartic ice caps begin to form. Event 36 Mediterranean Sea dries up and refills several times due to tectonic forces and dropping sea levels. -
Pliocene Epoch
Event 18 Various species migrated between continents across land bridges. Event 26 First modern horses appear. -
Pleistocene Epoch
Event 9 Homosapien (modern humans) appeared & are hunters. Event 20 Specues that did not evolve to survive extreme cold moved to warmer climate areas or became extinct (dire wolf & giant ground sloth.) -
Holocene Epoch
Event 19 The last glacial period ended and sea levels rose, Great Lakes formed. Event 28 Modern human developed agriculture and used tools made of iron and bronze. -
Permian Period
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 38 Environmental change causes mass extinction of sea invertebrates (Trilobrites and Eurypterids) as the seas retreat. -
Anthropogenic Epoch
Event 14 There is an argument as to when this epoch began, some scientists think it began with the Industrial Age in the early 1800's others think it began with the atomic age in the 1950's.
