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Precambrian Time (4600)
1) There is very little plant life during this period. 11) Nearly half of the valuable mineral deposits in the world occur I the rocks of this period. -
Period: to
Juan Corral P1
Geological Timescale -
Cambrian (542)
10) The presence of stromatolites indicates that shallow seas covered much of Earth during intervals in this period. 22) Trilobites appear. -
Ordovician (488)
23) shelled brachiopods appear. 30) Colonies of tiny invertebrates call graptolites flourished and vertibrates appear. Fish did not have jaws or teeth and their bodies were covered with bony plates. -
Silurian (444)
Eurypterids ( sea scorpions ), sea stars and coral became more common. 33) Vascular land plants and animals, such as scorpions begin to evolve on land. -
Devonian (416)
31) Huge plants begin to develop, early amphibians form. 37) Age of Fishes, fish that can breath out of the water and spend time in land form. -
Carboniferous (359)
2) Swamps and Forest cover the land. 34) Ichthyousauros are living in the ocean, new invertebrates call ammonite develop. -
Carboniferous Pennsylvanian (318)
4) Giant cockroaches appear. 15) Coal deposits form -
Permian (299)
2) Early reptiles resembling large lizards appears. 38) Environmental change causes mass extinction of sea invertebrates (trilobites & eurypterids) as the seas retreated. -
Triassic (251)
16) Welcome to the world of the dinosaur! Enter the squirrel sized dinosaur & the first forest dwelling mammals appear. 29) Small rodents evolve. -
Jurassic (200)
3) Flying reptiles called pterosaurs are in the air now. 13) Whoa those dinosaurs are getting big & dominate the land - Lizard - hipped appear - carnivores and herbivores have arrived. -
Cretacius (146)
5) First flowering plants appear - angiosperm. 35) Impact hypothesis - dinosaurs extinction. -
Paleocene (65.5)
6) Himalayas developed due to uplifting caused by the Indian subcontinent and the Eurasian continents colliding. 12) First primate evolve. -
Eocene (55.8)
17) Flying squirrels, whales and bats appear. 26) First modern horses appear. -
Oligocene (33.9)
27) Man early mammals become extinct, clams and snails flourish. 23) Antarctic icecaps begin to form. -
Miocene (23)
8) Appalachian Mountains are created because of the collision of tectonic plates & savannahs form. 18) Various species migrated between continents across land bridges. -
Pliocene 5.3
20) Species that did not evolve to survive extreme cold moved to warmer climate areas or became extinct ( dire wolf & giant ground sloth ). 36) Mediterranean Sea dries and refills several times due to tectonic forces and dropping sea level. -
Pleitocene 1.8
9) Homosapien ( modern humans ) appeared & are hunters. 25) World wide temperatures drop 4 degrees Celsius ( 39.2 degrees Fahrenheit ). -
Holocene 0.0115
19) The last glacial period ended and sea levels rose, Great Lakes formed. 28) Modern human developed agriculture and used tools made of bronze and iron. -
Anthropocene ( present )
7) Some scientist believe that human kind has caused mass extinctions of plants and animal species, polluted the oceans and altered the atmosphere. 14) This is argument as to when this epoch began, some scientist think it began with the industrial age in the early 1800's, others think it began with the atomic age in the 1995's.
