-
Precambrain
1-There is very little plant life during this period. The presence of stromalites indicates that shallow seas covered much of the Earth during intervals in this period. 10 -
Period: to
NJenkins6
Geological timescale -
Cambrian
Nearly half of all the valuable mineral deposits in the world appear in the rocks of this period. (11) Trilobites appear.(22) -
Ordovician
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.(30)1 There is very little plant life during this period -
Silurian
Eurypterids (sea scorpions), sea stars and coral become more common.(24)Vascular land plants and animals, such as scorpions begin to evolve on land.(33) -
devonian
Huge plants begin to develop, early amphibians form.(31) Age of Fishes, fish that can breathe out of the water and spend time on land form.(37) -
Mississipian
Swamps and forests cover the land.(2) Ichthyosaurs are living in the ocean, new invertebrades call ammonite develop.(34) -
Pennsylvanian
Giant cockroaches appear.(4) Coal deposits form.(15) -
Permian
Early reptiles resembling large lizards appear.(21) Environmental change causes mass extinction of sea invertibrates (trilobites and eurypterids) as the seas retreat.(38) -
Triassic
Welcome to the world of the Dinosaurs! Enter the squirrel sized dinosaur and the first forest dwelling mammals appear.(16) Small rodents evolve.(29) -
Jurrasic
Flying reptiles called pterosaurs are in the air now.(3) Whoa those dinos are getting big and dominate the land - Lizard-hipped and bird-hipped - carnivores and herbivores have arrived.(13) -
Cretaceous
First flowering plants appear.(5) Impact hypothesis - dinosaur mass extinction.(35) -
Paleocene
First primates evolve.(12) Himalayas develop due to uplifting caused by the Indian subcontinents colliding.(6) -
Eocene
Flying squirrels, whales and bats appear.(17) First modern horses appear.(26) -
Oligocene
Antartic icecaps begin to form.(32)Many early mammals become extinct, clams and snails flourish.(27) -
Miocene
Appalachian Mountains are created because of the collision of tectonic plates and savannahs form.(8) Various species migrated between continents across land bridges.(18) -
Pliocene
Species that did not evolve to survive extreme cold moved to warmer climate areas or became extinct (dire wolf and giant ground sloth).(20) Mediterranean Sea dries up and refills several times due to tectonic forces and dropping sea levels.(36) -
Pleistocene
Homosapien (modern humans) appeared and are hunters.(9)World wide temperatures drop about 4 degrees Celsius (39.2 degrees Fahrenheit).(25) -
Holocene
The last glacial period ended and sea levels rose, Great Lakes formed.(19) Modern human developed agriculture and used tools made of bronze and iron.(28) -
Anthropocene
Some scientists believe that human kind has caused mass extinctions of plant and animal species, polluted the oceans and altered the atmosphere.(7) There is argument as to when this epoch began, some scientists think it began with the industrial age in the early 1800's other think it began with the atomic age in the 1950's(14)
