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Precambrian Period (M 4,600)
EVENT 10 The presence of stromatolites indicate that shallow seas covered much of Earth during intervals in this period. EVENT 11 Nearly half of the valuable mineral deposits in the world occur in the rocks of this period. -
Period: to
J. Tello Period 1
Geological Timescale -
Cambrian (M 542)
EVENT 22 Trilobites appear. EVENT 23 Shelled brachiopods appear. -
Ordovician (M 488)
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 body plates. -
Silurian (M 444)
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 (M 416)
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. -
Mississippian Period (M 359)
EVENT 2 Swamps and forests cover the land. EVENT 21 Early reptiles resembling large lizards appear. -
Pennsylvanian Period (M 318)
EVENT 4 Giant cockroaches apear. EVENT 15 Coal deposits form. -
Permian (M 299)
EVENT 8 Appalachian Mountains are created because of the collision of tectonic plates & savannahs form. EVENT 38 Environmental change causes mass extinction of sea invertibrates (trilobites & eurypterids) as the seas retreat. -
Triassic (M 251)
EVENT 16 Welcome to the world of the Dinosaur! Enter the squirrel sized dinosaur & the first forest dwelling mammals appear. EVENT 34 Ichthyosaurs are living in the ocean, new invertebrates call ammonite develop. -
Jurassic (M 200)
EVENT 3 Flying reptiles called pterosaurs are in the air now. EVENT 13 Whoa those dinosaur are getting big & dominate the land-Licard- hipped and bird- hipped appear- carnivores and herbivores have arrived. -
Cretaceous (M 146)
EVENT 5 First flowering plants appear- angiosperm. EVENT 35 Impact hypothesis- dinosaur mass extinction. -
Paleocene (M 65.5)
EVENT 12 First primates evolve.EVENTS 29 Small rodents evolve. -
Eocene (M 55.8)
EVENT 17 Flying squirrels, whales, and bats appear. EVENT 25 World wide temperature drop about 4 degrees celsiuos( 39.2 degrees fahrenheit.) -
Oligocene (M 33.9)
EVENT 6 Himalays develop due to uplifting caused by the indian subcontinent and Eurasion continent colliding. EVENT 27 Many early mammal become extinct, clams and snails flourish. -
Miocene (M 23.0)
EVENT 32 Antarctic icecaps begin to form. EVENT 36 Meditterian sea dries up and refills several times due tectonic forced dn dropping sea levels. -
Pliocene (M 5.3)
EVENT 18 Various species migrated between continents across land bridges. EVENT 26 First modern horse appear. -
Pleistocene (M 1.8)
EVENT 9 Homosapien (modern humans) appeared & are hunters. EVENT 20 Specie that did not evolve to survive ectreme cold moved to warmer cliate areas or became exticnt (dire wolf & gian ground sloth.) -
Holocene (M 0.0115)
EVENT 19 The last glacial period ended and sea levels rose, Great lakes formed. EVENT 28 Modern humans developed agriculture and used tools made of bronze and iron. -
Anthropocene
EVENT 7 Some scientist believe that humans kind has caused mass extinction of the plants and animals species, polluted the oceans and altered the atmosphere. EVENT 14 There is argument as to when this epoch began, some scientist think that it begn with the indrusutial age in the early 1800's other think it began with the atomic age in the 1950's.
