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Period: to
R Abbott Period 6
Geological Timescale -
Precambrian 4,600 Ma
Event 10: Presence of stromotalites indicates that shallow seas covered much of Earth during intervals in this period.. Event 11 Nearly half the valuable mineral deposits in the world occur in the rocks of this period.. -
Cambrian 542 Ma
Event 22 Trilobites appear. Event 23 Shelled brachipods appear. -
Ordovician 488 Ma
Event 1: there is very little plant life during this period. Event 30 colonies of tiny invertebrates call graptolites flourished and vertebrates appear, Fish did not have jaws or teeth and their bodies were covered with bony plates. -
Silurian 444 Ma
Event 24 Euryptids, sea stars and coral become more common. Event 34 Vascular land plants and animals, such as scorpions begin to evolve on land. -
Devonian 416 Ma
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 -
Mississipian 359 Ma
Event 2 Forests and swamps cover most of the land. Event 21 Early reptiles appear resembling large lizards appear. -
Pennsylvanian 318 Ma
Event 4 Giant cockroaches appear. EVent 15 Coal Deposits form -
Permian 299 Ma
Event 8 Appalachian mountains are created because of the collision of tectonic plates & savannahs form. Event 38 Environmental changes mass extinction of sea invertebrates (trilobites & eurypterids) as the seas retreat. -
Triassic 251 Ma
Event 16 Welcome to the world of dinosaur! enter the squirrel sized dinosaur & the first forest dwelling mammals appear. Event 34 Ichthysaurs are living in the ocean, new invertebrates call ammonite develop. -
Jurassic 200 Ma
Event 3 Flying reptiles called ptersaurs 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 146 Ma
Event 5 First flowering plants appear angiosperm. Event 35 Impact hypothesis- dinosaur mass extinction -
Paleocene 65.5 Ma
Event 12 First primates evolve Event 29 Small rodents evolve. -
Eocene 55.8 Ma
Event 17 Flying squirrels, whales, bats appear Event 25 World wide temperatures drop about 4 degrees Celsius. -
Oligocene 33.9 Ma
Event 6 Himalayas develop due to uplifiting caused by the indian subcontinent and eurasian continents colliding Event 27 Many early mammals become extinct, clams and snails flourish. -
Miocene 23.0 Ma
Event 32 Antartic icecaps begin to form. Event 36 Mediteranean sea dries up and refills several times due to tectonic forces and dropping sea levels -
Pliocene
Event 18 Various species migrated between continents across land bridges. Event 26 First modern horses appear. -
Pleistocene 1.8 Ma
Event 9 Homosapien modern humans appeared & are hunters. Event 20 Species that did not evolve to survive extreme cold moved to warmer climate areas or became extinct ( dire wolf, giant ground sloth). -
Holocene 0.0115 Ma
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 bronze and iron -
Anthropocene
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 started some scientists think it began with the industrial age in early 1800s others think it began with the atomic age in 1950s.
