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Precambrian Period (4,600 MA)
10 The presence of stromatolities indicates that shallow seas covered much of Earth during intervals in this period, 11 Nearly half of the valuable mineral deposits in the world occur in the rocks of this period. -
Period: to
ATorrellas P.8
geological timescale -
Cambrian Period (542 MA)
1 There is very little plant life during this period, 23 Shelled brachiopods appear -
Ordovician Period (488 MA)
22 Trilobites appear, 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 MA)
24 Eurypterids (sea scorpions), sea stars and coral become more common. 33 Vascular land plants and animals, such as scorpions begin to evolve in land. -
Devonian Period (416 MA)
31 Huge plants begin to develop, early amphibians form. 37 Age of fishes, fish that can breath out of the water and spend time on land form. -
Mississippian Period (359 MA)
2 Swamps and forest cover the land 21 Early reptiles resembling large lizards appear. -
Pennsylvanian Period (318 MA)
4 Giant cockroaches appear. 15 Coal deposits form. -
Permian Period (299 MA)
8 Appalachian Mountains are created because of the collision of tectonic plates & savannahs form. 38 Environmental change causes mass extinction of sea invertibrates (trilobites & eurypterids) as the seas retreat. -
Triassic Period (299 MA)
16 Welcome to the world of the Dinosaur! Enter the squirrel sized dinosaur & the first forest dwelling mammals appear. 34 Ichthyosaurs are living in the ocean, new invertebrates call ammonite develop. -
Jurassic Period (200 MA)
3 Flying reptiles called pterosaurs are in the air now. 13 Whoa those dinos are getting big & dominate the land - Lizard hipped and bird-hipped appear - carnivores and herbivores have arrived. -
Cretaceous Period (146 MA)
5 First flowering plants appear - angiosperms. 35 Impact hypothesis - dinosaur mass extinction. -
Paleocene Epoch (65.5 MA)
12 First primates evolve. 25 World wide temperatures drop about 4 degrees celsius (39.2 degrees fahrenheit) -
Eocene Epoch (55.8 MA)
17 Flying squirrels, whales and bats appear. 29 Small rodents evolve. -
Oligocene Epoch (33.9 MA)
6 Himalayas develop due to uplifting caused by the Indian subcontinent and Eurasian continents colliding. 27 Many early mammal become extinct, clams and snails flourish. -
Miocene Epoch (23.0 MA)
32 Antartic icecaps begin to form. 36 Mediterranian Sea dries up and refills several times due to tectonic forcesa dn dropping sea levels. -
Pliocene Epoch (5.3 MA)
18 Various species migrated between continents across land bridges. 26 First modern horses appear. -
Pleistocene Epoch (1.8 MA)
19 The last glacial period ended and sea levels rose, Great Lakes formed. 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 MA)
9 Homosapien (modern human) appeared & are hunters.28 Modern human developed agriculture and used tools made of bronze and iron. -
Anthropocene Epoch (Current Date)
7 Some scientists believe that human kind has caused mass extinctions of plant and animal species, polluted the oceans and altered the atmosphere.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.
