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Precambrian- 4,600 MA
EVENT 1- There is very little plant life during this period. EVENT 11- Nearly half of the valuable mineral deposits in the world occur in the rocks of this period. -
Period: to
V Vigliarolo Pd4
Geological Timescale -
Cambrian - 542 MA
EVENT 10- The presence of stromatolites indicates that shallow seas are covered much of Earth during intervals in this period. -
Ordovician- 488 MA
EVENT 23- Shelled brachiopods appear. EVENT 30- -
Silurian - 444 MA
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- 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. -
Carboniferous: Mississippian- 359 MA
EVENT-2 Swamps and forests cover the land. EVENT- 34 Ichthyosaurs are living in the ocean, new invertebrates call ammonite develop. -
Carboniferous: Pennsylvanian- 318 MA
EVENT-4 Giant cockroaches appear. EVENT-15 Coal deposits form. -
Permian- 299 MA
EVENT-21 Early reptiles resembling large lizards appear. EVENT- 38 Environmental change causes mass extinction of sea invertibrates (trilobites & eurypterids) as the seas retreated. -
Triassic- 251 MA
EVENT-16 Welcome to the world of the Dinosaur! Enter the squirrel sized dinosaur & the first forest dwelling mammals appear. EVENT- 29 Small rodents evolve. -
Jurassic-200 MA
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- 146 MA
EVENT-5 First flowering plants appear - angiosperm. EVENT- 35 Impact hypothesis - dinosaur mass extinction. -
Paleocene- 65.5 MA
EVENT-6 Himalayas develop due to uplifting caused by the Indian subcontinent and the Eurasian continents colliding. EVENT-12 First primates evolve. -
Eocene -55.8 MA
EVENT-17 Flying squirrels, whales and bats appear. EVENT- 26 First modern horses appeared. -
Oligocene -33.9 MA
EVENT-27 Many early mammal become extinct, clams and snails flourish. EVENT- 32 Antarctic icecaps begin to form. -
Miocene -23 MA
EVENT-8 Appalachian Mountains are created because of the collision of tectonic plates & savannahs form. EVENT-18 Various species migrated between continents across land bridges. -
Pliocene- 5.3 MA
EVENT-20 Species that did not evolve to survive extreme cold moved to warmer climate areas or became extinct (dire wolf & giant ground sloth).EVENT-36 Mediterranean Sea dries up and refills several times due to tectonic forces and dropping sea levels. -
Pleistocene- 1.8 MA
EVENT-9 Homosapien (modern humans) appeared & are hunters. EVENT- 25 World wide temperatures drop about 4 degrees celsius (39.2 degrees fahrenheit). -
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- Current
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 This 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.
