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Precambrian MA 4600
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
D Estevez 8
Geological Timescale -
Cambrian MA 542
EVENT 22. Trilobites appear EVENT 23. Shelled brachiopods appear -
Ordovician MA 488
EVENT 10. The presence of stromatolites indicates that shallow seas covered much of Earth during intervals in 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 bony plates -
Silurian MA 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 MA 416
EVENT 31. Huge plants begin to develop, early amphibians form EVENT 37. Age of Fishes, fish that can breathe out of the water and spend time on land form -
Mississippian Period MA 359
EVENT 2. Swamps and forests cover the land EVENT 34. Ichthyosaurs are living in the ocean; new invertebrates call ammonite developIchthyosaurs are living in the ocean; new invertebrates call ammonite develop -
Pennsylvanian Period MA 318
EVENT 4. Giant cockroaches appear EVENT 15. Coal deposits form -
Permian MA 299
EVENT 21. Early reptiles resembling large lizards appear EVENT 38. Environmental change causes mass extinction of sea invertebrates (trilobites & eurypterids) as the seas retreat -
Trassic MA 251
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 MA 200
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 MA 146
EVENT 5. First flowering plants appear - angiosperm EVENT 35. Impact hypothesis - dinosaur mass extinction -
Paleocene MA 65.5
EVENT 6. Himalayas develop due to uplifting caused by the Indian subcontinent and Eurasian continents colliding EVENT 12. First primates evolve -
Eocene MA 55.8
EVENT 17. Flying squirrels, whales and bats appear EVENT 25. Worldwide temperatures drop about 4 degrees Celsius (39.2 degrees Fahrenheit) -
Oligocene MA 33.9
EVENT 27. Many early mammals become extinct, clams and snails flourish EVENT 32. Antarctic icecaps begin to form -
Miocene MA 23.0
EVENT 8. Appalachian Mountains are created because of the collision of tectonic plates & savannahs form EVENT 36. Mediterranean Sea dries up and refills several times due to tectonic forces do dropping sea levels -
Pliocene MA 5.3
EVENT 18. Various species migrated between continents across land bridges EVENT 26. First modern horses appear -
Pleistocene MA 1.8
EVENT 9. Homo sapiens (modern humans) appeared & are hunters EVENT 20. Species that did not evolve to survive extreme cold moved to warmer climate areas or became extinct (dire wolf & giant ground sloth) -
Holocene MA 0.0115
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 MA
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. 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
